The Gem Magazine #3

Responsible Water Management

Foreword by Christoffel Botha, Strategic Director - Water at Fugro and Advisory Council

Member at The Dewatering Institute

AYour guide to the latest news and insights into the global dewatering industry

TEAM

Publisher The Dewatering Institute

Designer Ian Mackie

Content Writer Nicole Steyn

Marketing, Sales & Content Riëtte Laas

Marketing Director Vivian Botha-Veldstra

Disclaimer

The views expressed in this publication are not necessarily those of the publishers. Whilst every effort was made to ensure accuracy the publisher and editors cannot be held responsible for any inaccurate information supplied and/or published.

Copyright The copywrite for all material published in this magazine is strictly reserved.

Tel: +27 +711 773 779

Email: riette@dewateringinst.com www.dewateringinst.com

s The Dewatering Institute heads into half a decade of serving the industry, it is a great privilege to be asked to write a foreword for The GEM (The Groundwater Engineering Magazine) which is now, amazingly, already in its 3rd addition. Usually I could easily ramble on for days or weeks (my wife would say months or years) about water, however the request came at a time in my life where I was also realising and reflecting on certain aspects in our industry, where we are heading and the way we are doing our business. I thus felt a responsibility and also obliged to share my thoughts…briefly.

I had a deep realisation on the importance of balancing between being a Civil Engineer, how we did things in the past, how we are doing them now and how we are / should / need to / be forced to do things in the future. Many of the realisations one might say are common knowledge or commons sense by now, however as I tell my two boys (11 and 13) often: “there is a difference between understanding and “understanding” things. The latter referring to more of an encompassing feeling then a recitement of knowledge gained. This however often gets met with blank stares from them, proving my point in fact.

Driving my paradigm shift wasthe privilege to receive blue zone accreditation from the Netherlands Government to attend and present at COP29 in Baku, Azerbaijan this year. It was an enlightening experience, bringing together over 65,000 delegates from around the world. This significant gathering underscored the urgency of global climate action, with discussions focusing on critical issues such as climate finance, adaptation strategies, and the implementation of the Paris Agreement.

We expect an additional 2 billion people on earth by 2050, a water demand increase of 30%, an expected water shortage of 40% by 2030 and as we stand today a staggering 33% of the SDG have stalled or even digressed. Water scarcity and flooding events are daily news.

Looking at the above, having experienced and partaken in key events to agree and discuss our way forward as humankind on this planet, its has become evident that the words, climate change, sustainability and resilience will form part of our daily lives if it not already are. Underpinning much of this is our water on this planet. How we mange, control and use it. This is where TDI and our industry will play a very important part in the future. The world will look at us, as experts, of how to control and manage this resource, not only on a small scale, but regional and large scales.

In the TDI annual awards, categories such as: young professional of the year, sustainable project of the year, innovation of the year, project of the year all forms part of setting our industry up for the future. Creating better ways of working to not only protect our planet, but also help mankind on how to do this.

For TDI, COP29 was particularly relevant. The discussions on sustainable water management and climate resilience directly align with TDI's mission to bring together the global dewatering and groundwater control industry together with their fundamentals of education, knowledge sharing, best practices and networking. Not only was it amazing to see how many of the Sustainable Development Goals can directly be related to water, but also it was a stark awakening to understand the mammoth task facing mankind in these areas.

It is also reassuring that at this time of reflection for me, the cover of the magazine is green and it houses many articles, information and items directly related to where we need to position ourselves as an industry to prepare for tomorrow.

Well done to TDI, its members and everyone making it possible for an entity like this to exist. I don’t believe we know yet, or rather “understand” the importance of what we do in our industry. Unfortunately, the way mankind is heading into the future it will become very evident how important our industry is and I am convinced we will be ready to help the earth being a safe and liveable word in the future.

Ferrer Dewatering Expands Expertise with CRN Partnership

Ferrer Dewatering, a global leader in water management and hydrogeology solutions, has taken a significant leap into the mining geology sector by acquiring a 48% stake in CRN, a Madrid-based consultancy specializing in geological and mining services. This strategic move signals Ferrer's commitment to broadening its expertise and strengthening its position in the mining industry.

A Strategic Alliance for Growth

The partnership brings together Ferrer’s cutting-edge dewatering and hydrogeology capabilities with CRN’s deep knowledge of mining geology, creating a dynamic synergy that promises to redefine client service delivery. With over 25 years of experience, CRN has built a strong reputation in geotechnical and mining consultancy, working on high-profile projects across Europe and Africa. The collaboration enables both companies to optimize resources, expand their service offerings, and improve operational efficiency.

Ferrer CEO, Alejandro Ferrer, emphasized that the partnership is more than a financial investment— it’s a strategic alignment of expertise aimed at delivering integrated solutions to clients worldwide. CRN’s services, which include mine design, resource estimation, and geotechnical studies, perfectly complement Ferrer’s existing portfolio, offering clients end-to-end solutions for complex projects.

Expanding Global Reach

This collaboration also opens new doors for global expansion. Ferrer plans to establish a new office in Madrid, strengthening its presence in Spain, while CRN is set to grow its operations in Valencia and Canada. Thesedevelopments align with Ferrer’s vision to enhance its influence in key markets, particularly in mining regions that require advanced geological and water management solutions.

The partnership was prominently showcased at the recent Mining and Minerals Hall (MMH) in Seville, where Ferrer and CRN demonstrated the value of their combined expertise.

As one of the most influential industry events, MMH provided an ideal platform for the companies to present their collaborative approach and network with international stakeholders.

Pioneering Sustainable Solutions

In addition to business growth, the alliance reflects Ferrer and CRN’s shared commitment to innovation and sustainability. By integrating their expertise, the companies aim to develop sustainable practices in mining and water management, addressing challenges such as groundwater depletion and environmental impact.

Looking Ahead

The Ferrer-CRN partnership represents a significant step forward in the convergence of dewatering and mining geology services. With a shared vision for innovation, resource optimization, and global expansion, the alliance is poised to set new industry standards and deliver exceptional value to clients worldwide.

Authors: Ferrer Dewatering

Below: CEO Alejandro Ferrer on the left and CRN advisors joining him.

BBA Pumps Introduces Pump Drive Systems of the Future

Above: The picture was taken in the southern Netherlands at a large sand quarry. A mobile pump, with a diameter of six inches, was utilized for dewatering, handling a flow rate of about 400 cubic meters per hour.

Recently, BBA Pumps in The Netherlands organized an introduction week for a select group of pump professionals.

The aim of this event was to share energy knowledge and introduce new drive technologies for mobile pumps. The transition to sustainable energy and CO2 reduction goals demand innovation. BBA Pumps is at the forefront of this and have designed an impressive new line on the road to net zero.

BBA Pumps will introduce the new eco-friendly pump systems extensively in the coming months. The theme is Pump Drive Systems of the Future, think battery-electric pumps, methanol fuel cell pumps, units with hydrogen combustion engines and many more clean and energy-efficient systems.

Electrification

Electrification generally means replacing fossil energy sources with electricity that is generated from sustainable sources. It is the process of replacing technologies with electric variants, where previously only non-electric options were used. The aim of electrification is to reduce CO2 emissions. Electricity can be generated in

a climate-neutral manner and therefore plays a major role in sustainability.

Also, in the world of mobile pump units we see an increase of electrically driven pumps. BBA Pumps standardized the pump series years ago for both drive systems. Pump users can choose between a diesel-driven pump set in accordance with the applicable emission requirements, or the same pump but powered with an electric motor.

BBA Pumps innovations in electrification

With the accelerating adoption of EVs (Electric Vehicles), we are already getting used to charging batteries in our cars instead of filling a fuel tank. Major manufacturers in the transport sector, construction equipment and earthmoving machinery are also focusing their innovation budgets on electrification.

There is a similar trend in the world of mobile pump units, we see a greater focus on the environment, energy use and emissions. In the anticipation of these future trends, BBA Pumps innovation team has delivered a huge achievement. In addition to

the existing electric mobile pumps on mains power, we are introducing the first battery electric pumps.

Battery-powered electric pumps

The BBA Pumps battery electric mobile pumps are driven by an electric motor and are assembled inside a canopy. Unlike before, the role of the canopy was to reduce the motor noise. Battery electric pumps are super quiet in themselves. The canopy is now part of theoverall design, housing all electrical components and a Lithium Iron Phosphate (LiFePO4) battery pack.

As standard the pump unit is equipped with an energy-saving feature. By using the automatic level control, energy consumption can be reduced. With smart management, the running time on the battery pack can be significantly increased.

A solar panel on the canopy door ensures that the 12-volt traction battery remains charged. This separate battery is required to activate the systems at start-up, and the solar panel also contributes to reducing total energy use.

Electric battery + DPU dewatering pump

With battery electric + DPU, the pump is driven by an energy-efficient electric motor. A built-in frequency controller controls the motor. The pump set is equipped with a mains connection and a battery pack. When the unit is connected to mains power, the energy flows automatically through the battery and is used for driving and charging.

In the absence of mains power, the electric motor runs on energy drawn from the battery pack. When the battery is emptied, a built-in diesel generator automatically switches on to recharge the battery.

The generator is a 1-cylinder diesel power unit (DPU) with DriveOn® technology. The pump set is equipped with its own fuel tank for this purpose. The diesel generator always runs at an efficient load, resulting in minimal emissions.

Methanol

This process can significantly reduce the carbon footprint compared to methanol made with energy from fossil fuels.

Methanol can offer a sustainable solution, especially for applications that require significant energy or need to run for extended periods.

A methanol fuel cell pump is driven by an energy-efficient electric motor. The pump and electric motor are assembled in a canopy with a large methanol fuel tank at the bottom. The pump set is also equipped with a reformer, a fuel cell and a battery pack.

How does a methanol fuel cell pump work?

The mobile pump is installed at the job site, for example a wellpoint dewatering project. The electric motor is started to drive the pump, which draws energy from the battery pack.

If there is a mains connection available, then the pump can be connected to it. In this case the pump works in the same way as a battery electric pump. If there is no mains connection at the wellpoint dewatering project, fill the tank with a methanol-water mixture.

In transitioning to sustainable forms of energy we also see a lot of interest in methanol as an alternative to fossil fuels. Methanol is a liquid and is mostly synthetically produced. It is the simplest form of alcohol (poisonous) and with the formula CH₃OH consists of one carbon atom, four hydrogen atoms and one oxygen atom.

Methanol can be produced from renewable sources such as biomass, waste products or even from CO₂ extracted from the air.

BBA Pumps’ methanol innovations

We opted for a fuel cell systemfor the development of our first methanol powered mobile pump.

A fuel cell converts an energy carrier, usually hydrogen, directly into electrical energy. The principle is electrochemical without a combustion process.

This makes fuel cells efficient and environmentally friendly.

This is purchased as pre-mix in a volume ratio of 60/40%. The pump is still driven by the electric motor, when the battery runs out the reformer automatically switches on.

A chemical reaction takes place in the reformer: this reaction converts methanol into hydrogen. The hydrogen then goes to the fuel cell to be converted into electricity. The electricity is stored in the battery pack and used to drive the pump. As soon as the battery is fully charged, the fuel cell switches off again to reduce operating hours.

Above: BBA Pumps battery electric centrifugal pumps or high head and sewage pumping

Methanol fuel cell pump

Author: Henno Schothorst, BBA Pumps

Above: BBA Pumps PT100 electric battery + DPU dewatering pump

Hydrogen is the lightest and most abundant element on Earth. Hydrogen is gaseous, odorless and invisible.

The properties of hydrogen are very similar to that of natural gas. This provides insight into how hydrogen can be used as a fuel or energy carrier. Hydrogen has the highest energy density per unit weight with an upper value of 141 MJ/kg. That is more than three times that of natural gas and diesel.

A hydrogen molecule (H₂) is made up of two hydrogen atoms (H). There is no presence of carbon in the molecule, so hydrogen does not emit CO2. This leads us to the role that hydrogen can play within a sustainable energy system.

BBA Pumps hydrogen innovations

The BBA Pumps innovation team has taken an impressive step in the use of mobile hydrogen pumps, the first mobile pumps with hydrogen drive are ready for

production. We will begin with hydrogen combustion engines for our dry selfpriming BA pumps. The next step in the hydrogen development process will be mobile pumps with a fuel cell.

The first model is a BA150KS D285 sewage pump. The centrifugal pump and vacuum system are standard. We use a hydrogen combustion engine to drive the pump. This four-cylinder 2.2-liter engine delivers a power of 25.6 kW at 1800 revolutions per minute. The M10-23X canopy is fitted with special features for safety compliance.

A second pump set is the

For the drive we use a stronger hydrogen combustion engine with a power of 67.5 kW. The M12-29 canopy is also provided with features to ensure safety working safety. Mobile pumps with hydrogen

combustion engines emit no CO2. Of course, this assumes that you use only green hydrogen! Follow BBA Pumps on social media for more news on Pump Drive Systems of the Future!

Heldervue - Ensuring clear vision for sustainable water management

The Fruit Farm Group

The Fruit Farm Group (TFFG), established at the end of 2014, has farms distributed over four countries and three continents. Its farmers produce a variety of soughtafter fruits by implementing sustainable and regenerative agriculture practices. They strive towards healthy soils, saving water, and vibrant ecosystems. In doing so, their plants receive the nutrients they require to produce healthy fruit. The company is especially well known for producing, packaging, distributing, and marketing fruit in Southern Africa.

Heldervue

Heldervue is one of five South African farms part of TFFG. The farm is located on top of the Piketberg Mountain in the Western Cape, an area well known for cultivating deciduous fruits including apples and pears. This region has a typical Mediterranean climate, with warm, dry summers and cold, wet winters.

During summer, they rely on boreholes and storage dams for irrigation. The area forms part of the Breede-Olifants Water Management Area (WMA), according to the 2023 classification.

Company: GEOSS South Africa Pty Ltd

Country: Fruit Farm Group (TFFG)

Location: Western Cape

Previously, Heldervue was situated on the border between the Berg and Olifants-Doorn WMA’s. In 2010, the Berg and Olifants-Doorn WMA’s were classified by the Department of Water and Sanitation as those having the lowest volume of available groundwater per year (DWS, 2010).

The Geohydrology of Heldervue

There are 17 boreholes located on the Heldervue farm, of which 9 have been

monitored since 2017. These boreholes are drilled into the quartzitic Peninsula Formation of the Table Mountain Group, which is a fractured super-aquifer (Blake et al., 2010).

Considering that the farm is situated on top of a mountain, the geology is complex (Figure 1). The locations of the boreholes are plotted with yellow dots in Figure 1 and the locations of the monitoring boreholes are displayed in Figure 2. The boreholes are fairly deep (80+ meters) and low yielding (2-5 L/s).

The Groundwater

Above: BBA Pumps BA150KS D285 with hydrogen combustion engine

Above: BBA Pumps PT100 methanol fuel cell pump for wellpoint dewatering

BA180E D328, multifunctional hydrogen pump. Here we will also utilize a standard vacuumassisted sewage water pump from the BA series.

Above: Figure 1

The Geology of Heldervue on the Piketberg Mountain

Left: Figure 2 Monitoring Borehole Locations on the Heldervue Farm

Author: Marige Carstens, GEOSS South Africa Pty Ltd

Table 1 Heldervue Rainfall Data (2013–2023)

*Data is displayed in millimeters and collected from a rain gauge at Heldervue (32°48’47.14”S, 18°43’18.83”E).

The Hydrology of Heldervue

There are 9 dams Figure 3, located on the main farm portion of Heldervue, spread across six catchment areas (Grobler & Barrow, 2021). Only 54.35% of the total surface area of the farm drains into the dams (Grobler & Barrow, 2021). Additionally, groundwater is used to fill the dams.

A drought hit the Western Cape of South Africa from 2016-2018. Rainfall was low and the draw down of the borehole water levels were as low as the pump inlet. In Table 1 the effect of the drought is clear in 2017, when the farm only received 61% of the 10-year average yearly rainfall.

The Drought and Invasive Plant Species

Groundwater’s resilience to drought is well-known and many would respond by drilling more boreholes (DWS, 2010). However, TFFG had a different approach to the multi-year drought.

In South Africa, invasive plant species pose a serious threat to the ecosystem because they increase evapotranspiration and above-ground biomass, which reduce surface water runoff and groundwater recharge (Chamier et al., 2012).

About 5% of our priceless water resources are consumed by invasive plant species, which also lowers the carrying capacity of our natural rangelands.

Richard Bugan, Hydrogeologist for The Nature Conservancy in South Africa.

According to CapeFarmMapper 3 (2023), the potential evapotranspiration loss on the Piketberg Mountain is 1100–1 200 mm/year. Increases in evapotranspiration brought on by invasive plants result in lower dilution and higher concentrations of nutrients, contaminants, and suspended particles in water as well as reductions in streamflow and groundwater recharge rates (Chamier et al., 2012). Where evapotranspiration exceeds rainfall, irrigation is needed to ensure a healthy crop.

Heldervue’s Adaptation Strategy

The farm's alien plant species lowered the amount of water that drained into the storage dams on the property and lessened the potential discharge from the watershed. To assure continuity in irrigation water supplies and to alleviate water stress, TFFG partnered with BlueScience to evaluate the costs of removing and controlling the invasive species, as well as the potential benefits.

BlueScience identified Black Wattle, Eucalyptus, and Port Jackson as the

most common alien species found on the Heldervue farm (Grobler & Barrow, 2021). Densely infested areas covered 14.93 ha and moderately infested areas covered 11.06 ha (Grobler & Barrow, 2021). Under a moderate rainfall scenario, an 8.11% increase in surface runoff was predicted upon the completion of the alien vegetation clearing (Grobler & Barrow, 2021).

Outcomes

Heldervue started the alien clearing process in August 2021, and by August 2022 most of the aliens were cleared. They started from the northern farm boundary and worked to the south. In Figure 4 (below), the area where the alien clearing took place is indicated in yellow.

During January 2024, the shallowest (best recovered) groundwater levels were measured since monitoring commenced in 2017. Significant groundwater recharge was observed at all of the monitoring boreholes and can be attributed to the alien clearing.

Surface runoff increased and resulted in increased groundwater recharge and drainage into storage dams. The triple La Niña of the past three years (2021-2023) also resulted in reduced abstraction from the boreholes. The Eikevlei boreholes are located at the southern border of the farm.

Eikevlei BH3 Figure 5 (next page) and Eikevlei BH2 Figure 6 were used as case studies.

Case Studies

In Figure 3, the consequence of the drought can be observed from 2018 to 2021, when pumped water levels were running at the pump inlet. This poses a risk of burning out the pump and dewatering the aquifer and is a result of insufficient recharge and increased abstraction due to below-average rainfall. Eikevlei BH3 is one of the main production boreholes on the farm and could not be left to rest. The period when alien clearing occurred is marked with a red band on the graph in Figure 3 It is evident that since alien clearing started in August 2021, water levels have begun to rise.

The recharge potential on the farm increased and the good rainfall of 2023 resulted in reduced abstraction. Before alien clearing, the static water level was 80 meters below ground level (mbgl). After the good rainfall of 2023, and the completion of the alien clearing in August 2022, static water levels were 20 mbgl. The static groundwater level recovered by an astonishing 60 meters. The water level has since dropped during the 20232024 summer period, as abstraction increased and rainfall reduced but still demonstrates significant improvement.

Above: Figure 3 Monitoring Borehole Locations on the Heldervue Farm

Above: Figure 4 Alien Clearing Area on Heldervue

In Figure 6 (below), a decommissioned borehole, Eikevlei BH2, is shown. This borehole can be considered a proper monitoring borehole, as no abstraction has been taking place since the end of 2021, when water levels dropped below the pump inlet.

The period when alien clearing took place (August 2021 – August 2022) is also marked with a red band on the graph in Figure 6. Since abstraction ceased, and the alien vegetation cleared, water levels continued to rise. Static water levels were 70 mbgl before 2022. Manual water level measurements obtained in January 2024 showed that the static water level was ~10 mbgl, also indicating a 60 m rise in the groundwater levels. During May 2024, the water level was still at ~20 mbgl, according to manual measurements.

Discussion and Conclusion

Maclear already identified the significance of saving water in South Africa in 1995 due to rising demands on limited water resources (Maclear, 1995). With a sustainability mindset, Heldervue placed itself in a very good situation.

The early implementation of a groundwater monitoring and management plan helped them understand their drought resilience. Due to its value in the agricultural sector, groundwater is directly related to food

security and must be treated as a limited resource in land-use planning (DWS, 2010).

All essential precautions must be taken to protect the resource and its recharge processes (DWS, 2010) and even though very few studies have quantified the impacts of invasive alien plants on stream flow, runoff, or groundwater recharge (Chamier et al., 2012) Heldervue took a leap of faith and is now “picking the fruit”.

The conjunctive use of surface water and groundwater, in addition to the removal

Innovation for a greener tomorrow, one drill at a time.

Malcolm Drilling is proud to announce the introduction of our new Sonic Drills built PFASfree, setting a new standard in environmentally responsible drilling technology. These state-of-the-art drills are manufactured without the use of per- and polyfluoroalkyl substances (PFAS).

As a leader in geotechnical and foundation construction, Malcolm Drilling continuously strives to innovate and improve its methods for tackling complex projects. The built PFAS-free Sonic Drill not only ensures safer and cleaner drilling operations but also underscores Malcolm’s commitment to reducing the industry’s environmental impact and advancing sustainable practices.

of alien vegetation, will ensure long-term water security on the farm.

Acknowledgements

I would like to express my gratitude to Mr Trevor Dukes and The Fruit Farm Group for allowing me the opportunity to write about their success. A special thanks goes out to Mr Jaco Botma for sharing all the required information.

Additionally, I would like to thank Mr Dana Grobler, who shared his knowledge.

References Blake D., Mlisa A. and Hartnady C., 2010. Large scale quantification of aquifer storage and volumes from the Peninsula and Skurweberg Formations in the southwestern Cape. Water SA, 36(2): 177-184. Bonthuys J., 2021. Assessing groundwater reclamation benefits of clearing invasive alien trees – insights from the Atlantis aquifer. The Water Wheel: 34-37. Cape Farm Mapper 3, 2023. Western Cape Government Department of Agriculture. Available online: https://gis.elsenburg.com/apps/cfm/ [Accessed: 03 June 2024]. Chamier J., Schachtschneider K., Maitre D.C.L., Ashton P.J. and Van Wilgen B.W., 2012. Impacts of invasive alien plants on water quality, with particular emphasis on South Africa. Water SA, 38(2): 345-356. DWS, 2010. Groundwater Strategy 2010. Available online: https://www.dws.gov.za/Groundwater/gs.aspx [Accessed: 03 June 2024]. Grobler D. and Barrow S., 2021. The Potential Runoff Reduction on the Heldervue Farm Piketberg due to Alien Invasive Vegetation. BlueScience, Somerset West. Maclear L.G.A., 1995. Cape Town Needs Groundwater – A Note on the Potential of the Cape Flats Aquifer Unit to Supply Groundwater for Domestic Use in the Cape Town Metropolitan Area. Geohydrology Directorate, Department of Water Affairs and Forestry, Cape Town.

This innovation significantly strengthens our efforts toward environmental sustainability by mitigating the risk of cross-contamination during drilling operations, protecting both the environment and public health.

Malcolm Drilling’s Sonic Exploration

Drilling service offers unmatched precision and efficiency in subsurface investigation.

Our advanced sonic drilling technology provides continuous, high-quality core samples, allowing for precise analysis of soil and rock properties. This method significantly reduces drilling time and minimizes site disturbance, making it an ideal solution for environmentally sensitive areas and projects requiring minimal disruption.

By offering these groundbreaking technologies, Malcolm Drilling reinforces its reputation for excellence and forward-thinking solutions.

Malcolm Drilling specializes in providing innovative geotechnical and specialty foundation solutions for challenging projects. With a dedicated team and advanced equipment, we deliver accurate and timely results, ensuring cost and time savings for our clients.

Figure 5: Eikevlei BH3 Water Level and Monthly Rainfall (2017 – 2024 YTD)

Figure 6: Eikevlei BH2 Water Level and Monthly Abstraction (2018 – 2023)

Van Tongeren Watertechniek reflects on a landmark year

Below: Guido van Tongeren, owner / entrepreneur Van Tongeren Watertechniek & GeoHydron and Christoffel Botha, a member of the TDI Advisory Council.

For Van Tongeren Watertechniek, 2024 was a year of milestones, celebrating 75 years of craftsmanship, innovation, and dedication to sustainable groundwater management. It was a time to honor a rich legacy while looking ahead to a future of continued innovation and opportunity. The highlight of this anniversary year was the largest groundwater festival of 2024, held on October 4 and 5.

This event celebrated shared achievements and reflected the passion that defines Van Tongeren: groundwater technology.

75 Years of expertise and innovation

Since its founding in 1949, Van Tongeren Watertechniek has been a trusted name in the sector. The journey began with Henk van Tongeren, who, following World War II, launched a plumbing and well-drilling business using custom-built machines, some repurposed from military vehicles. What began as a small familyrun operation has grown into a leader in groundwater technology. Through adaptability and innovation, the company played a vital role in the Netherlands’ post-war reconstruction and laid the foundation for a wide range of services in the industry.

Today, Van Tongeren Watertechniek operates through five specialized companies: Henk van Tongeren Water & Techniek, Raaijmakers en Zn. Bronbemaling, Tjaden Adviesbureau

voor Grondmechanica, Theo van Velzen Grondboortechniek and Bronbemaling and Beemsterboer Boringen and Bemalingen.

Together they are Bronbemaling.com, a powerhouse of expertise, equipped to address diverse groundwater challenges with confidence.

Celebrating with the year’s largest water festival

The 75th anniversary was commemorated with a two-day festival in Apeldoorn, featuring an engaging mix of keynote presentations, discussions, and activities. Friday, October 4, focused on groundwater management and the impacts of climate change, while Saturday, October 5, spotlighted teamwork and collaboration.

On the first day, meteorologist and climate expert Margot Ribberink opened the program with an insightful talk on the challenges climate change poses for water management and the steps needed to address these issues. She was followed by Christoffel Botha, a member of the advisory board at The Dewatering Institute (TDI), who explored the future of groundwater management and the technological innovations driving sustainability.

Later that day, Professor Ruud Schotting, a hydrogeology professor and Harold Lever, chair of the ONG division at Bouwend Nederland, discussed the

future of water management. Their talks highlighted the importance of scientific insights and the expanding role of groundwater management in underground networks and urban development.

Saturday brought a more informal approach, focusing on the human side of success. Former professional cyclist Gert Jakobs and former football star Kees Kist captivated attendees with stories of resilience, teamwork, and motivation, drawing parallels between their sports careers and the shared values that drive success in the groundwater sector.

The festival also included exclusive behind-the-scenes tours of Van Tongeren Watertechniek, offering visitors a closer look at the cutting-edge technologies and processes that enable the company to deliver sustainable groundwater solutions every day.

Connection at the heart of the anniversary

Reflecting on the milestone event, owner Guido van Tongeren shared:

“

What stood out most to me was how this anniversary brought people together, not only colleagues from our specialized companies across The Netherlands but also business partners, family, and friends. Despite the variety of faces, both familiar and new, there was a shared sense of purpose and passion for groundwater technology.

”Looking ahead to 2025

Building on the lessons and inspiration of 2024, Van Tongeren Watertechniek enters 2025 with renewed energy and focus. The company remains dedicated to driving innovation, strengthening partnerships with organizations like TDI, and building sustainable solutions for clients, communities, and future generations.

With 75 years of expertise as a foundation, Van Tongeren Watertechniek is ready to shape a groundwater-secure tomorrow. Here’s to the next chapter of innovation and excellence!

Author: Roné van der Vliet

TDI AWARDS 2024

Celebrating Global Excellence in Groundwater Innovation

The TDI Awards 2024, in its third year, United global dewatering and groundwater professionals to honor industry excellence, innovation, and commitment.

This year’s event was an outstanding success celebrating the remarkable accomplishments of individuals and companies driving innovation and paving the way for a more sustainable and efficient future in the dewatering industry. With 11 expert judges from across the globe, the awards attracted 40 entries representing a cross-section

of the industry, from smaller consultancies to large contractors and consultants, across 8 categories.

The TDI Awards were attended by over 50 online participants, including CEOs and managers from renowned dewatering organizations worldwide, culminating in 20 nominees and 8 category winners.

The event underscored the strength and growth of TDI’s global network and its pivotal role in fostering collaboration and excellence across the sector.

The ceremony was expertly co-hosted by Peter Brooke, Regional Director Strategic Sales and Marketing at Fugro and Vivian Veldstra-Botha, TDI Marketing Director and President of Roscoe Moss, Timothy Lynch delivered an inspiring address on the excellent calibre of project submitted for this years’ awards.

Special thanks go to our 2024 judging panel, award presenters who made this remarkable event possible. Their support ensures the continued recognition of exceptional contributions to our field.

During the ceremony, Chris Botha, representing the TDI Advisory Council, delivered an inspiring keynote message on the future of water and the dewatering industry worldwide. Highlighting the complexity of the field, Chris described dewatering and groundwater control as both an art and a science, requiring precise predictions and innovative approaches.

He emphasized the critical role of TDI in shaping the industry's future and as an industry addressing global challenges like urbanization, climate change, and water scarcity.

Reflecting on TDI’s impact, Chris stated:

“ ”

TDI’s role in our field is invaluable. It’s not enough to simply transfer knowledge— we must actively drive innovation and progress to secure the future of our industry. Events like this

award ceremony shine a spotlight on our capabilities and demonstrate to the world what we can achieve.

Looking ahead, he expressed optimism about the industry’s potential to meet growing demands for sustainable water management, emphasizing the importance of collaboration and innovation in the years to come.

Congratulations to the 2024 award winners

Looking ahead to TDI 2025

As we celebrate the successes of 2024, we are already looking ahead to next year’s TDI Awards. In 2025, we’ll once again honor the incredible achievements of dewatering professionals from around the globe. We can’t wait to see the industry’s ongoing innovation and dedication to excellence.

Do you have a project, product, or team you want to showcase? Nominations for the 2025 TDI Awards will open soon. Stay tuned for updates by subscribing to the TDI newsletter or emailing Riette Laas at riette@dewateringinst.com

Don’t miss the opportunity to share your story and celebrate the outstanding work being done in our industry.

These awards remain a powerful testament to the dedication, creativity, and resilience of the dewatering and groundwater control community. Thank you to everyone who contributed to making the TDI Awards 2024 a truly unforgettable event. We look forward to seeing you at the TDI Awards 2025!

Wells / Drilling Project of the Year:

Dewatering

Young Professional of the Year: Martin Welsford, Stuart Wells Ltd. Groundwater Treatment Project of the Year: Keller North America Dewatering Consultant

Excellence Company of the Year: Hydroserv International

Owen Gilbert Chief Executive Officer at NCS Fluid Handling Systems Inc. and NCS at Environmental Solutions Ltd.

Niel Kriel Operations Hydrogeologist at Rio Tinto, Perth, Western Australia

Dr. Joseph Sopko Director at Keller North America

Mark Claassen Regional Director, Tunnel Construction Management, East USA at Hatch Peter Brooke Regional Director Strategic Sales & Marketing Europe & Africa at Fugro

Timothy D. Lynch President at Roscoe Moss

Andres Pinto MSc., Civil Engineer, Engineering Division Manager at Terratest Qatar LLC

Clément Lerevenu Deputy Project Manager to Qatar Hydrogeological Assessment Project, Sr. Hydrogeologist at Egis

Robin Lomulder Senior Hydrological Consultant at Fugro

Francois Gous Dewatering Specialist / Technical Engineer at Project Dewatering Limited

Dr. Kym Morton Water Strategist and Consulting Mining Hydrologist at KLM Consulting Services Pty Ltd

TDI Young Professional of the Year 2024

Tgrouted in permanent conductor casing. The works were then successfully installed and operated by Stuart Wells.

What do you predict will be the most significant challenges for the industry in the future?

In the UK, the biggest challenge facing dewatering are the regulatory bodies permit processing times. From the point of submission, in my experience, clients are waiting anywhere between 4 to 18 months to get the required licenses to undertake dewatering legally.

Therefore, vast amounts of money are being spent of construction redesigns to avoid dewatering, which is ultimately resulting in more concrete and steel being installed into the ground, and thus permanently affecting our environment and aquifers.

In what ways do you envision technology influencing the industry in the coming years?

he Dewatering Institute (TDI) is proud to spotlight outstanding professionals in the dewatering and groundwater engineering field through its monthly interview series. This edition features Martin Welsford, an accomplished dewatering specialist and groundwater engineer who serves as Associate & Technical Manager at Stuart Wells Ltd. With a BSc (Hons), recognition as a Fellow of the Geological Society (FGS), and membership in the Institution of Civil Engineers (AMICE), Martin recently earned the prestigious Young Professional of the Year Award, during the The Dewatering Institute Awards 2024, for his significant contributions to the industry. Join us as he shares insights into his career journey, technical expertise, and vision for the future of dewatering.

What led you to the dewatering field, and what motivated your choice?

It all started when I was about six, I was completely obsessed with Dinosaurs, geology, the natural earth, evolution, and science. This motivated me to study Geology at University. I chose the University of Plymouth as it had a renown course, excellent field trip opportunities, and bonus - Professor Iain Stewart lectured there at the time!

Whilst studying for my undergraduate degree, I was fascinated by Hydrogeology, Groundwater Engineering and Engineering Geology, and wanted to explore these areas once I had graduated.

After being offered a position at Stuart Wells, my career started by immersing myself in the practical elements of

dewatering. In that role I had vast exposure to a variety of interesting dewatering projects, all around the UK. My love for dewatering started there and I haven’t looked back since.

Have any projects been instrumental in launching your career?

One of the most important projects I’ve worked on was an artesian groundwater control design on High-Speed Rail 2, at the River Leam Viaduct.

I lead and managed the design works when I was at Preene Groundwater in 2023.

The works were particularly difficult because there was a confined artesian groundwater head, approximately 5m above existing ground level. This confined

aquifer posed a risk to the installation of a series of deep piles and risked basal heave of excavations.

I analysed the factual ground information available and produced an initial hydrogeological conceptual model for the site. This highlighted some key areas that needed quantifying.

I determined the extra ground investigation requirements and produced groundwater investigation specifications. I supervised the additional testing to ensure compliance with specifications and analysed the extra testing data to refine the hydrogeological conceptual model.

The groundwater control design ultimately comprised a series of pumped artesian dewatering wells, with

I am excited to see the potential of artificial intelligence, and how it can be utilised for analysing ground, groundwater and dewatering data. I hope these technological advances can streamline data processing and interpretation, so that collected data is analysed in a better way and in shorter timeframes.

Also, there has already been a transition to low carbon HVO fuels, but It will be interesting to see if additional alternative fuels, such as hydrogen, become viable and affordable. If so, their introduction into construction will mean that we can continue to pursue dewatering in the most sustainable way possible.

What elements of the industry do you believe require improving?

Data sharing and publicly available hydrogeological information. I would like to see a national public database generated for pumping tests, pumping test data and groundwater level data. I feel this would massively improve designers understanding of ground conditions at the desk study stage. Which would aid in getting a clearer idea of the hydrogeological conceptual model of sites prior to intrusive works.

Why do you think TDI is important for the industry and how it can help the industry develop?

I think it’s important to have an international body solely dedicated to groundwater control, as it helps to further legitimise the industry.

Groundwater control is often overlooked until it becomes a problem, which often means it is more costly and complicated than it needs to be. Working with the TDI allows contractors and consultants from around the world to share knowledge, discuss, and learn from our experiences. This pushes us as individuals, and our companies forward, and ultimately improves standards within the industry.

Ultimately, who stands as your most enthusiastic advocate? Professionally? I have a couple

David Wright, Managing Director at Stuart Wells. Since I entered the industry, David has been a constant source of support and

guidance for me, both personally and professionally. His mentorship has pushed me to grow, develop and broaden my skills. I wholly appreciate all the time and energy David has invested in me and am grateful for his continued support and belief in me.

Dr Martin Preene. I was lucky enough to work alongside and was mentored by Martin at Preene Groundwater Consulting. Martin has helped me further develop my knowledge and capabilities, and together we worked on some incredibly interesting, challenging, and innovative groundwater control designs. Since both leaving Preene Groundwater, Martin continues to support my professional development, and I am grateful for all his ongoing support.

In my life in the wider sense, definitely my wife Steph. No matter what I am doing, or where I am in life, she’s has always believed in and supported me, even when we were both penniless youths! I am incredibly lucky to have her by my side.

What stage are you at in your career right now?

I am at the stage where am starting to establish myself as a dewatering and groundwater specialist. I still have plenty to learn, but I am passionate about what I do, and I am committed to being the best I can possibly be!

What is your life motto?

A society grows great when old men plant trees whose shade they know they shall never sit in.

– Greek Proverb.

Above: Martin Welsford. TDI Young Professional of the Year 2024

Above: Marin Welsford

Central Doha & Corniche Beautification Package

The Public Works Authority (PWA) and General Consultant (Parsons) were engaged to undertake the master planning and design of the Central Doha and Corniche Beautification (CDCB) Project. The CDCB project covers downtown Doha from Al Corniche Road to C-Ring Road.

The project covers the institutional, government, and prestige developments between Al Corniche Road and A-Ring Road, and the commercial, residential, and business developments between A-Ring Road and C-Ring Road. The scope of work includes the following: eleven structures and TSE, SW & FOUL utilities (3km trenching + manholes).

Company: Hydroserv International Country: Middle East Location: State of Qatar

Left: Corniche Pedestrian Underpass, Corniche Seaside Plaza, Corniche Cityside Plaza & Utility Building

3.

Project Challenges

The nature of the geology in the area, karstic limestone, and the close proximity of the sea as a source of recharge meant the system needed to be designed with flexibility to meet any unexpected inflows. Wherever we have an additional in-flow at the site, we installed additional electrical sump pumps to avoid flooding at the site.

The sedimentation tank and clarifier are cleaned regularly to ensure optimal performance and maintain the efficiency of the dewatering system. The Corniche is one of the busiest routes in Qatar and it was a project requirement that it remain open during the entire works. The impact of this was:

projects in the vicinity of the site, as a result was aware of the variable ground conditions and identified that this would be a high risk to the project that would lead to project delays and cost escalation.

Due to the site's location, the only viable discharge options were direct discharge to the sea and to the stormwater network (manholes). As per QCS 2014, maintaining both the quantity and quality of the water within the permit parameters set by MOECC and PWA proved to be a significant challenge.

Unfortunately, due to space limitations on-site, there was no suitable area available for installing retention or settlement lagoons or ponds to manage high-turbidity water. To address this issue, we implemented our in-house designed lamella clarifiers to reduce turbidity. Additionally, we secured multiple discharge points within the site boundary to disperse the water more evenly across a larger area.

• The Al Bidda Underpass and Tunneling works had to be completed in 3 phases to maintain the flow of traffic along the corniche. The dewatering system requires pipe welding works and to be operated fully over the entire tunnels even under the live road as it was diverted, and new phases were dewatered.

• Ministry headquarters, business towers and office buildings were located adjacent to this project site. These structures made access difficult making installations and monitoring works a daily challenge.

Project Summary

The following is a summary of the dewatering works for Central Doha & Corniche Beautification Package Initially, the main contractor wanted to excavate using an open-cut method. Hydroserv had experience with other

As part of Hydroserv’s value engineering and risk mitigation approach, it proposed conducting a pumping test in each area to assess the effectiveness of the hydraulic barriers. Using the data generated it also performed a sensitivity analysis and numerical modeling.

Although the scope was broad and many challenges were faced in this project, Hydroserv was able to successfully dewater the whole scope.

There was a total flow of 1,750 l/s for the 11 nos. of structures and a total peak flow of 100 to 250 l/s for every 100Lm trenching works.Hydroserv installed a total of 222 nos. of deepwell pumps, 28 nos. of sump pumps, 84 nos. of diesel pumps, 42 nos. of generators, 8 nos. of lamella water clarifiers, 6 nos. of v-notch weir discharge tanks and 6,500 meters of HDPE pipes (range from 250mm Ø to 630mm Ø) during the course of this project.

Above: TSE, SW & FOUL utilities (3km Trenches + manholes)

Above: Corniche Pedestrian Underpass, Corniche Seaside Plaza, Corniche Cityside Plaza & Utility Building

HSLA Steel a 100-Year Legacy

High-Strength, Low-Alloy (HSLA Steel) has been a cornerstone in industrial applications for over a century, valued for its exceptional strength and corrosion resistance. Its reliability makes it a preferred choice for water well construction, extending the lifespan of wells and enhancing their economic efficiency.

A Brief History

The development of HSLA steel began in the 1920s and 1930s, with extensive research led by industry leaders United States Steel (USS) and Kaiser Steel. After a decade of experimentation and testing various metallurgy compositions, USS introduced COR-TEN steel in 1933, the first commercial HSLA steel.

Its innovative composition—incorporating chromium, nickel, silicon, copper, and phosphorus—delivered:

50% higher strength compared to structural carbon steel.

4-6 times the corrosion resistance of standard carbon steel.

This breakthrough provided engineers with lightweight, durable solutions for various industrial needs.

ASTM Guide G101 presents a method for estimating the atmospheric corrosion resistance of low-alloy, weathering steels such as A606 Type 4. Specifically, the ASTM Guide calls out the following:

Early Applications

As industrial innovation continued to expand during the mid-20th century, HSLA steel became the material of choice for industries requiring its superior strength and increased corrosion resistance. Key applications included:

• Railroad freight cars

• Railroad passenger cars

• Mine cars

• Automotive equipment

• Tanker Trucks

• Container ships

• Bridge trellises and supports

Today, HSLA steel remains vital for heavy machinery components, and structural projects like bridges, and buildings. Given HSLA’s 100-year record of success, water well designers and owners rely on HSLA casing and screen for the construction of wells requiring strength, longevity, and economic efficiency.

HSLA Steel in Water Wells:

Physical and Chemical Requirements

While HSLA steel offers numerous advantages, not all HSLA steels guarantee the level of corrosion resistance required for water wells. For water well applications, it’s critical to specify HSLA steel that meets ASTM Standard A606 Type 4 requirements.

ASTM A606 Type 4 unique requirement is explicitly described below:

For [HSLA] Type 4 steel, the basis for this evidence is a corrosion-resistance index calculated from the chemical composition of the steel in accordance with Guide G101. To comply with ASTM Standard A606 Type 4, steel shall have a minimum corrosion-resistance index of 6.0, based upon Guide G101.

Equations for predicting corrosion loss of low-alloy steels after 15.5 years of exposure to various atmospheres, based on the chemical composition of the steel, were published by Legault and Leckie. For use in this guide, the Legault-Leckie equation for an industrial atmosphere was modified to allow calculation of an atmospheric corrosion resistance index based on chemical composition.

The Legault-Leckie equation is listed below:

Atmospheric Corrosion Resistance Index ( I )

( I ) = 26.01*(% Cu) + 3.88*(% Ni) + 1.2*(% Cr) + 1.49*(% Si) + 17.28* (% P) – [7.29*(% Cr)*(% Ni)] – [9.10*(% Ni)*(% P)] – 33.39*(% Cu)2

Resistant

Benefits of ASTM A606 Type 4 HSLA Steel

Compared to mild steel, A606 Type 4 HSLA steel offers: 9x higher corrosion resistance, confirmed by field analysis (Williams, 1990).

Significantly higher strength:

- Tensile strength: 75,000 psi (vs. 50,000 psi for mild steel) - Yield strength: 55,000 psi (vs. 35,000 psi for mild steel)

These qualities make A606 Type 4 HSLA steel ideal for water well casings and screens, ensuring extended operational life and reliability in demanding environments.

As illustrated by the table above, today’s HSLA steel conforming to A606 Type 4 must possess a minimum quantity of alloying elements such as Copper, Chromium and Nickel. Compared to mild steel, A606 Type 4 HSLA steel offers: 9x higher corrosion resistance confirmed by field analysis Williams, 1990).

Significantly higher strength: - Tensile strength: 75,000 psi (vs. 50,000 psi for mild steel) - Yield strength: 55,000 psi (vs. 35,000 psi for mild steel)

The

Legacy of HSLA Steel

For over 100 years, HSLA steel has proven its unmatched performance in the operation and longevity of water wells. To maximize the benefits of HSLA steel in water well casing and screen, specifying ASTM A606 Type 4 ensures the strength and corrosion resistance needed for long-term success.

Above: Barclay’s Center in Brooklyn, NY. Exterior façade constructed from HSLA Steel.

Above: HSLA A606 Type 4 Pipe Manufactured at Roscoe Moss Company’s Los Angeles Facility

Article by Roscoe Moss Company

Adventure Park Groundwater Treatment

The Adventure Park stormwater capture project in Whittier, CA, involves the construction of an underground stormwater storage and treatment system capable of holding approximately 19.5 acre-feet of water. The primary objective of this project is to divert stormwater from Sorensen Drain to an underground concrete vault. This vault serves as a pre-treatment facility to ensure that stormwater meets regulatory standards before it is discharged into the local sanitary sewer system.

The Challenge

The construction of the new vault posed significant challenges, particularly due to the high groundwater table prevalent in the area. Managing groundwater during excavation was critical, necessitating a robust groundwater control system to mitigate potential issues.

During the planning phase, groundwater samples were analyzed to assess water quality against the Water Quality Board’s maximum contaminant levels (MCLs) for discharge compliance. Analysis revealed elevated perchlorate concentrations exceeding recommended MCLs, highlighting the imperative for treatment of dewatering effluent before discharge.

Given the scale and depth of the excavation, anticipated flow rates at the site were substantial, necessitating large-scale treatment equipment. Perchlorate, being a highly soluble contaminant, demanded specialized ion exchange treatment for effective removal.

Company: Griffin Fluid Management

Country: Country: USA

Location: Whittier, CA

Duration: 2023 - 2024

The Solution

Griffin tailored a comprehensive solution to address these challenges, designing and installing a groundwater control system around the storage vault capable of handling flow rates of up to 500 gallons per minute (gpm).

The treatment process integrated mechanical filtration alongside specialized ion exchange media specifically engineered to eliminate perchlorate from the water. This integrated approach not only ensured compliance with regulatory standards but also optimized operational efficiency throughout the project lifecycle.

Griffin’s comprehensive dewatering and water treatment services ensure seamless project execution and simplify client project management. Their dedicated field teams expertly handle every aspect through meticulous system installation and maintenance, delivering exceptional results and upholding Griffin’s standard of excellence.

E.D.R.S joins as TDI's latest member

Founded in 1996, Drilling & Pumping Contractors

E.D.R.S specializes in drilling services

TDI is excited to announce that E.D.R.S has become a Company Member of The Dewatering Institute (TDI). Empowerment Drilling & Remediation Sales is renowned as a leading entity in the sectors of Drilling, Dewatering, Pumping, and Remediation.

Their team collectively boasts over 150 years of expertise in drilling, testing, and pump installation. EDRS has successfully executed projects across several southern African nations, including the Central African Republic, Democratic Republic of Congo,Zambia, Botswana, Lesotho, Zimbabwe,Namibia, South Africa, Mozambique, and Madagascar.

Currently, the company operates from Elandsdrift with an additional office located in Cape Town, South Africa. Owned and managed by professionals in geology and hydrogeology, EDRS offers a distinctive combination of scientific insight and technical expertise.

Delivering exceptional service to every client is their top priority. With over 40 dedicated team members, many of whom have been part of the company since its founding, they ensure high standards. Their equipment ranks among the best in quality.

They also offer comprehensive support services, including a well-equipped workshop where they produce alltheir drilling supplies. EDRS is widely recognized as a leader in the Drilling, Dewatering, Pumping, and Remediation industries.

“They are devoted to the adoption and upkeep of a safety, health, and environmental management system that alignswithboth national and international standards and best practices.

”All employees are responsibleand accountable for ensuring implementation and compliance with the aims and principles of this policy.

Services include:

• RC Exploration Drilling Onshore Gas Exploration ~800m

• RC Grade Control Sonic Drilling SDC-550 Rig– Unconsolidated

• Geothermal Drilling & Loop installations IGPSHA accredited

• Mine Dewatering Drilling

– large diameter boreholes Bulk Mine

• Water Supply Drilling Aquifer Test Pumping – 10m³/hr – 450m³/hr

• Environmental Drilling & Contracting Services Dump Drilling

• Vacuum Pumping & Excavations

Borehole rehabilitation & decommissioning.

Project Dewatering Limited: UK dewatering contractor turns

Author: Francois Gous Dewatering Specialist / Technical Engineer for Project Dewatering Limited.

1999 – Project Dewatering Ltd is established

Project Dewatering is created by a team of knowledgeable professionals to serve the UK construction industry. Applying practical solutions to geotechnical problems whilst collaborating with specialist drilling contractors.

2000 – Channel Tunnel Rail Link (CTRL)

The Channel Tunnel Rail Link, now High Speed 1 (HS1), is the UK's first high-speed rail line, connecting the Channel Tunnel to London. PDL installed 22 deep dewatering wells, monitoring wells, and piezometers, initially for temporary dewatering but later integrated into a permanent system. These wells, with a 120-year design life, included pumping equipment and headworks connected to control panels with alarms to regulate water levels critical to Stratford Station's construction. This project was a great success and showcased our competence in the field of dewatering.

2003 – Gibraltar Europort Hospital

PDL supported Gibraltar's largest hospital project by managing belowground excavations for four cofferdams

(up to 8m deep) and 160m of drainage runs (up to 4m deep). For the cofferdams, 14 deep wells were drilled to 14m in fine sand, tested, and fitted with submersible pumps. Vacuum wellpoints were used for drainage runs, connected to a header main powered by diesel vacuum pumps.

PDL also conducted pumping tests and installed monitoring standpipes to ensure the design’s effectiveness.

2006 – Belfast Sewers Project

Belfast's state-of-the-art stormwater tunnel, part of Northern Ireland Water's £160m project, aimed to upgrade sewer networks, increase stormwater capacity, and reduce flood risks.

PDL was tasked with controlling groundwater inflow during the construction of 20 shafts, ranging from 6m to 37m in diameter and 25m to 55m deep. PDL conducted ground condition and inflow analyses to design tailored dewatering solutions for each shaft. For high-flow shafts, external deepwells were installed, while ejector well systems were used for lower-flow shafts in less permeable soil. In shafts at risk of base heave, internal pressure relief wells were employed. In total, 57 wells were installed, reaching depths of up to 50m.

2008 – Tyne Tunnel

The New Tyne Crossing in Newcastle, completed in 2011, doubled the capacity of a 1967 road tunnel, easing congestion on a key north-south route.

PDL provided temporary dewatering for the tunnel approaches on both sides of the River Tyne. For the North approach, 9 deep wells (30m deep) were installed within a diaphragm wall to manage sub-artesian pressure. On the South approach, 35m deep ejector wells were used to dewater silty sands. PDL also conducted pumping tests and a wellpoint pump-and-treat operation to address contamination in an upper gravel aquifer using an oil/water separator tank.

2012 – Stoke Bardolph

At the Stoke Bardolph anaerobic digestion plant, a third CHP unit boosted electricity generation to 23GWh annually. Plans in 2016 proposed adding a third digestion stream to increase output to 44GWh annually and enable biogas export. PDL designed a dewatering system for a 156m x 75m Activated Sludge Plant Tank and eight 36mØ Final Settlement Tanks, constructed in Holme Pierrepoint Sand & Gravel overlying Mercia Mudstone. The system provided lateral groundwater

cut-off for slope stability and achieved a draw down from 18.5mAOD to 14.0mAOD across a 35,000m² area. This involved 800 vacuum wellpoints installed via waterjetting and 12 Geho ZD900 piston pumps to maintain groundwater levels, ensuring dry and safe excavation conditions.

Northstowe’s large housing development aims to create a town of 10,000 homes for 25,000 residents. PDL managed groundwater control to facilitate trench excavations for drainage runs & open cut excavations for building foundations in sandy, gravelly strata with high groundwater levels. Over 2000 wellpoints were installed across the project, as the new town in Cambridgeshire was created.

Project Dewatering Ltd is acquired by German dewatering business Hölscher Wasserbau in an expansion of their international department. The intention is to grow the business in to new markets in the emerging ground source energy sector. Hölscher, see the UK & Project Dewatering as an ideal location to apply their extensive geotechnical and drilling experience through knowledge sharing which is subsequently extended through the Hölscher International companies.

2017 – Open loop ground source heating and cooling

Project Dewatering are successfully awarded multiple GSE projects across the UK. With a focus on Central London, the company completes the specialist drilling for the open loop geothermal energy boreholes at the Chelsea Barracks development where renewable heating and cooling uses water from the chalk aquifer of the London Basin. Four 80m deep, 500mm diameter bores were drilled by reverse circulation drilling. The wells underwent acid treatment and

rigorous development through airlift and intermittent pumping to ensure compliance with strict environmental standards.

2020 – Citigen Decarbonisation Project

Moving on to larger scale and more experimental works, Project Dewatering work with E-On at Citigen. The Decarbonisation Project aimed to integrate a ground source heat pump with existing CHP boilers and chillers to reduce carbon dioxide emissions by up to 50%, improve air quality by cutting NOx emissions, and align with City of London and Greater London Authority requirements. PDL supplied, installed, tested, and commissioned the borehole package, managing all plant, equipment, traffic, and temporary works. The scope included drilling three 200m-deep boreholes. These were initially drilled at 670mm diameter to 50m depth, cased with 12mm-thick steel, and then continued as open-hole to 200m at 450mm diameter.

PDL’s contributions earned the Wells and Drilling Project of the Year 2023 award from The Dewatering Institute.

2024 - PDL’s 25th Anniversary

Achieving a significant anniversary comes with an expansive and diverse backlog of projects. The current team celebrate with colleagues, family, friends and clients the growth through experience that PDL has gained.

2015 – Northstowe

2016 - Hölscher Wasserbau

The Bull Lake Dam Project

Introduction

The Bull Lake Dam Spillway Modifications project required an intricate dewatering strategy to ensure the stability and safety of the excavation for the spillway stilling basin. This submission outlines the innovative and technical aspects of the dewatering plan, executed by Malcolm Drilling Company, Inc. (Malcolm) focusing on methods, risk mitigation, safety measures, and the overall success of the project. The project began in late 2019 and was completed and decommissioned in February 2024.

The dewatering plan aimed to lower groundwater levels, control seepage, maintain the stability of cut slopes, prevent hydrostatic uplift, and provide dry working conditions during excavation of the new spillway and lazy river. The plan required multiple sonic soil samples, pumping tests and integration of threedimensional modeling to achieve the target groundwater levels and ensure construction proceeded as intended.

The dewatering project stands out for the well drilling project of the year due to its innovative application of a combination of eductor wells, deep wells and vacuum assist deep wells (VADW). The use of a Sonic Drilling to collect continuous soil samples allowed Malcolm to log and characterize the soils during the construction of the wells. The real-time data collection of the water levels and pumping volumes enabled a realtime pump test to help determine the potential connection to the reservoir.

Company: Malcolm Drilling Company

Country: USA

Location: Wind River Reservation, WY

Duration: 2019 - 2024

This comprehensive approach ensured efficient water removal across varying site conditions, maximizing both effectiveness and reliability of the dewatering system. Adding to the project's uniqueness, Malcolm devised an innovative vacuum assist system for deep wells, tailored specifically to the diverse soil conditions encountered on site. This customized solution enhanced the deep well performance, addressing challenges posed by the heterogeneous soil composition and ensuring optimal dewatering.

Project Overview and Scope

Geology of the Project

Due to the remote project's location and difficult access to it, only one boring in the middle of the future spillway was provided for bidding purposes. Other borings outside the project location were available; however, they were considered but not used for the dewatering system design. Subsurface investigations indicated that the primary foundation unit for the new spillway is Quaternary Glacial Lacustrine (Qgl), consisting of fine grained, laminated sediments. To the west, beneath Bull Lake embankment dam, these sediments transition to Quaternary Glacial till (Qgt), typically classified as fine-grained Silt (ML) and Lean Clay (CL). While the deposits were mainly fine-grained (clay and silt), borehole logs and index test summaries indicate a sand content of 25 to 30 percent. The presence of sand within the soil matrix may be significant if present as stringers, lenses, enhancing the

to create both a high local vacuum and sufficient discharge pressure. This setup allows water to be brought back to the ground surface through the return riser pipe. The application of additional high vacuum induced at depth by the jet-eductor assembly (or jet pump) can be particularly advantageous in lowpermeability soils, helping to lower pore pressures, increase effective stress, and expedite consolidation and drawdown.

Groundwater flow modeling assumed that eductor wells extend 60 feet below the excavation bench, operating continuously with a reduced hydraulic head. This model facilitated the calculation of seepage quantities and dewatering drawdown rates, forming the basis for the design of the JetEductor Dewatering System to ensure effective groundwater management prior to excavation. Performance calculations, based on Powrie and Preene's equations, were employed to assess eductor sizing, supply flow rates, induced groundwater flow, and performance under backpressure conditions. A set of monitoring wells was installed to verify the effectiveness of the dewatering system before excavation commenced.

horizontal hydraulic conductivity of the soil’s mass.

A modified groundwater drawdown and recovery test near the new spillway stilling basin indicated a hydraulic conductivity of 0.01 feet per day for silt and clay units, as presented by United States Bureau of Reclamation (USBR). Consolidation testing provided additional soil properties: a moisture content of 19.9%, a specific gravity of 2.73, and a dry density of 103.2 pcf. Estimated values include a void ratio of 0.65, a total porosity of 39.5%, and a saturated bulk density of 127.9 pcf. These properties were crucial for determining the coefficient of volume change and specific storage, used in designing the dewatering system to predict drawdown rates.

Phase A: Jet Eductor System

The low-permeability glacio-marine soils are not conducive to conventional dewatering approaches using pumped wells that rely solely on gravity flow drainage. Vacuum wellpoints are considered, but the excavation depth required for the spillway stilling basin exceeds practical limits for suction lift from a single stage or tier of wellpoints. This is especially notable due to the reduced atmospheric pressure at the site's higher altitude, which is 20 percent lower than at sea level.

A primary system of jet-eductor dewatering wells was deemed suitable for addressing the low-permeability soils. Jet-eductor’s utilize individual jet pumps located near the bottom of each well

Left and top: Initial Jet-Eductor Dewatering Design

Installation of the dewatering system utilized a TSI 150cc Sonic drill. Malcolm engaged Geo Engineers to log all boreholes for both dewatering and monitoring wells. Throughout the drilling process, 100% sonic cores seven-inch in diameter were obtained, and all samples were stored in bags for logging purposes. A total of 52 eight-inch boreholes were drilled and utilized as eductor wells, with an additional 30 small-diameter wells installed at various depths within the spillway. Approximately 5,600 feet of drilling was completed for the contractual system.

Phase B: Additional Investigation

The project had significant discrepancies between the expected and actual subsurface conditions, which impacted the dewatering system's performance. The original hydraulic conductivity value provided by the USBR was 0.01 ft/day, which was used for the dewatering system design. However, ongoing piezometer testing revealed actual hydraulic conductivity values up to ten times higher, suggesting more complex soil conditions than initially anticipated. The presence of interconnected sandy layers had led to higher recharge rates, overwhelming the dewatering system.

Additionally, automated and manual water level monitoring showed variable groundwater responses, indicating that the dewatering system's current setup was insufficient to handle the observed groundwater inflows. After several months of observation and daily meetings with the owner it was determined that additional sonic drilling and dewatering efforts would be needed. The approach was to drill a series of small diameter wells to a depth of 150 feet between the spacing of the current system. After the wells were installed pump testing was conducted to help determine the lower unit of water. Then, the system was allowed to run in conjunction with the contractor's system while water levels were monitored.

The results were positive but not sufficient to draw the water down to the levels needed to excavate. During the additional exploratory drilling it was determined that the water was in some way connected and was feeding the bottom of the excavation from a depth of between 250 to 312 feet below the ground surface. Malcolm recommended installing deep wells and vacuum assist deep wells due to the presence of discrete sandy zones that resulted in lateral seepage into the stilling basin excavation area.

Phase C: Deep Wells and Vacuum Assist Deep Wells

Malcolm recognized the critical importance of maintaining stability and implemented stringent water level control measures to prevent soil erosion, sloughing, and potential collapses, thereby ensuring a safe working environment for construction crews and minimizing risks to surrounding infrastructure. Malcolm proposed drilling deep wells and utilizing Vacuum Assist Deep Wells (VADWs) around the excavation site.

Innovation of Well

VADWs involve drilling deeper into the ground where water accumulates from underground aquifers and highwater tables beneath the settling basin. These wells incorporate a surface-based vacuum pump system connected to the deep well via pipes. The vacuum pump creates negative pressure inside the well, effectively lowering the water table within and around it. As pressure decreases within the well, water from surrounding soil and aquifers begins to flow towards the wellbore, accelerated by the vacuum's pressure differential. VADWs are renowned for their efficiency in dewatering, particularly in drawing water from deeper and less permeable soils compared to traditional methods.

Risk Mitigation

Malcolm Drilling installed a total of 349 wells, including piezometers, deep wells, and VADWs around the excavation site, ranging in depths from 22 feet to 312 feet. Risk mitigation was a pivotal focus throughout the project, encompassing 39,020 linear feet of drilling to facilitate safe excavation. Daily operations included drilling, logging soil samples, and collecting inflow and outflow data. Weekly reports provided clients with findings and settlement analyses.

Future Implementation

In soil formations with low permeability, such as clays or silts, water movement can be sluggish, posing challenges for traditional dewatering methods. VADWs offer a more robust draw down, efficiently pulling water between these soils. Traditional well types may struggle to reach sufficient depths to lower water tables in deep aquifers effectively, whereas VADWs can operate effectively at significant depths due to their vacuum-assist mechanism. VADWs provide precise control over water level drawdown, crucial in construction sites requiring stable water levels to prevent soil instability or groundwater contamination.

Safety

Training: All personnel underwent extensive training on the operation and safety protocols of the dewatering system. Each member of the dewatering team was trained, licensed, and tested.

Monitoring: Continuous monitoring of groundwater levels and system performance ensured excavation safety. Malcolm implemented a 24-hour pump watch with two personnel on site. Daily water level readings were conducted and reported to the owners.

Well Treatment/Swabbing: Well swabbing and cleaning due to organic biological growth was conducted every day aimed at removing microbial or algae buildup inside wells. The process often includes physical cleaning with brushes or swabs to remove biofilms and deposits that can impair well performance and water quali

Due to Malcolm’s extensive training and safety program there were no reported injuries in the three years of maintenance. Additionally due to the regular cleaning and maintenance, Malcolm prevented clogging , reduced pumping costs, and maintained the integrity of the groundwater system and the safety of operators. )

Conclusion

The successful implementation and performance of the deep Vacuum Assist Deep Well (VADW) at Bull Lake Dam, including adjustments for well fouling and real-time system design changes, highlight its potential as a best practice for future projects in similar geological conditions. This system's efficiency, adaptability, and minimal environmental impact provides a valuable method for construction dewatering in low permeable soils. The dewatering wells played a pivotal role in ensuring stable and dry conditions for the spillway excavation.

The performance of the wells surpassed expectations, effectively managing groundwater levels and demonstrating the unique advantages of a combination of jet-eductor wells, VADW, and small-diameter deep well systems in challenging soil conditions. The success of the Bull Lake Dam Spillway Modifications project underscores Malcolm‘s technical expertise as an innovative solution provider.

This project serves as a testament to the successful application of advanced dewatering systems, emphasizing innovation, safety, and effective risk mitigation. Not only did it achieve its objectives, but it also established a new benchmark for dewatering practices in similar construction environments.

Right: Vacuum Assist Deep Wells Schematic

Below and right: Organic Growth in Wells

Above: Differing Site Conditions Evaluation Reports

Predict Environmental Software

Company: NCS Fluid Systems

Country: Canada

Location: Nisku, Alberta

The environmental industry is a complex and cumbersome space with many pain points that create cost and confusion and waste time. This is true for end-users, environmental consultants, solution providers and regulators, making it a prime candidate for disruptive technology.

The engineering and chemical calculations, bench-testing, pilot-testing and research that is involved in getting actionable answers are a tremendous burden to technical professionals and very intimidating to a non-technical person. PREDICT is an A.I. based software tech-nology that utilizes science, laboratory, and field data to provide quick and simple answers to the environmental industry.

The typical life cycle of an environmental project can have as many as 16 stages/ steps; PREDICT can be a powerful tool in 11 of these complex steps, by providing quick, ondemand answers to technical and non-technical users. Engineers, environmental managers, operators, regulators, solution-provider salespeople and maintenance professionals can utilize PREDICT to:

• Save Time

• Reduce Cost

• Share information

• Obtain quick actionable answers

• Estimate Cost

Vapor phase activated carbon modeling

Liquid phase activated carbon modeling

Ion exchange consumption modeling

Greensand regeneration modeling

Sludge production calculations

Pressure drop modeling for air treatment

Pressure drop modeling for water treatment

Crowd sourcing

How Does It Work?

Features of Computer Modeling

Artificial Intelligent Powered Modeling

Ability to model over 16,000 chemicals

3. Cf is the final concentration of an ion in the solution (mg/L)

4. Vf is the final volume of the solution (L)

PREDICT is available as a web-application. Individual and corporate subscription models allow for a cost-effective approach adding this powerful resource to your team with no impact to your CAPEX budget.

Water Treatment Modelling

Features of Predict:

• Activated Carbon Modeling: Predict computer modeling program provides predictive calculations of activated carbon performance, consumption, & pressure drop for over 16,000 chemicals, in both vapor and liquid phase applications; with the ability to adjust for temperature, relative humidity, and type of activated carbon. A.I. powered smart search can simulate any new contaminants that are not in the database.

Ion Exchange Modeling: Ability to predict the performance of ion exchange media for the removal of over 50 common ionic contaminants in wastewater.

Sludge Generation Modeling: Allows for solid waste generation modeling on a wastewater treatment project by calculating sludge generation volume.

Shareable Reports: Creates shareable reports that can be saved on the cloud, shared with vendors, customers, and regulators.

Predict’s activated carbon modeling software is powered by three sources: The Freundlich equation or Freundlich adsorption isotherm. An adsorption isotherm is an empirical relationship between the quantity of a gas adsorbed into a solid surface and the gas pressure. The same relationship is also applicable for the concentration of a solute adsorbed onto the surface of a solid and the concentration of the solute in the liquid phase. In 1909, German scientist Herbert Freundlich gave an expression representing the isothermal variation of adsorption of a quantity of gas adsorbed by unit mass of solid adsorbent with gas pressure. This equation x/m = k.P1/n is known as Freundlich adsorption isotherm or Freundlich adsorption equation.

Experimental results supporting the Freundlich equation, validating the behavior of adsorption within a certain range of temperatures and pressures.

Artificial Intelligence capabilities that allow machine learning to model almost any chemical, while predicting the accuracy of the modeling, based on the Freundlich equation and inputted experimental data.

Predict utilizes the capacity of the ion exchange material (volume of exchangeable ions it can remove from a solution), the composition of the solution (concentration and type of ions present in it), and a mass balance equation to relate the volume of ions removed by the ion exchange material to the volume of ions remaining in the solution. The mass balance equation can be written as: Qi=Ceq,iCiVi−CfVf

where:

1. Ci is the initial concentration of an ion in the solution (mg/L)

2. Vi is the initial volume of the solution (L)

5. Qi is the capacity of the ion exchange material for an ion (mg/g)

6. Ceq,i is the equilibrium concentration of an ion on the ion exchange material (mg/g)

This equation powers Predict and allows the user to model ion exchange consumption based on an individual application’s flow and concentrations.

Over 100 commonly used ion exchange brands’ capacity data are pre-loaded into the Predict modeling program. If you do not find your specific ion exchange brand, Predict can estimate and model the ion exchange consumption by guiding you through a simple process of selecting what type of product you plan on utilizing for your project.

A wide array of ion exchange resins is available to remove dissolved ionic contaminates from water. IX resins target contaminants for removal based on their electrical charges.

Strong Acid Cation (SAC) resins are often the best choice for water softening and demineralization applications. SAC resins are a relatively safe and costeffective method for removal of scaleforming hardness, such as calcium and magnesium, as they may be regenerated with a concentrated salt solution, such as a sodium chloride brine. When used in the hydrogen cycle with sulfuric or hydrochloric acid (HCl) as a regenerant, SAC resins are also highly effective for demineralization.

Weak Acid Cation (WAC) resins are a cost-effective choice for de-alkalization applications where the feed water has a high proportion of hardness to alkalinity. The WAC resin accomplishes this by removing divalent cations (i.e., calcium), and replacing them with

hydrogen / sodium depending on process conditions. Depending upon process needs, the IX process may be followed with degasification and/or pH adjustment. WAC resins are also good choices for softening of streams with high salinity.

Strong Base Anion (SBA) are a good choice for silica removal and removal of uranium, nitrates (NO3) and halogens.

Weak Base Anion (WBA) resins are effective for deionization applications where removal of carbon dioxide (CO2) and/or silicon dioxide (SiO2) is not required. WBA resins are also effective for acid absorption, as they work to neutralize strong mineral acids.

Chelating resins are effective for removal and/or recovery of metals from solutions, including solutions with high dissolved solids concentrations. Applications using chelating resin include sodium (Na), potassium (K) and lithium (Li) brine purification for feeding electrochemical cells, hydrometallurgy, metals concentration, and recovery for metals such as cadmium (Cd), cobalt (Co), nickel (Ni), and copper (Cu).

Polymer Catalysts are mostly used for organic contaminants such as phenols, alcohols and aldehydes.

When planning a water treatment project, where you are using flocculants or coagulants, knowing your solid waste (sludge) volumes is a critical part of project management and operational planning. Predict software allows you to simply input each individual contaminant in your water, followed by the flow rate or volume of water. Based on your input parameters, Predict will calculate the anticipated solid waste generated.

As with all other Predict’s modeling, you can generate a report, with your imbedded information, that can be easily shared with your team, client, or regulatory agencies.

Sanford Dam Restoration Sanford, Michigan

Project Summary

The Griffin team designed and installed an eductor dewatering system for acritical dam rehabilitation project in Sanford, Michigan. The Sanford Dam is located on the Tittabawassee River approximately 11 miles upstream of Midland, Michigan. It is the most downstream of a set of four (4) dams and was built to provide water level control for the purpose of hydroelectric power generation.

The Challenge

In May of 2020, heavy flooding resulted in the catastrophic failure of the Edenville Dam embankment, sending a wall of water downstream in the Tittabawassee River and completely draining Wixom Lake. The breach wave quickly overwhelmed the downstream Sanford Dam, and caused embankment failure. Over 10,000 residents in Sanford, Midland, and Saginaw were evacuated.

› As part of the repair and rehabilitation process, a new low-level outlet (LLO) was proposed to be added onto the existing concrete dam

› This would require rerouting the river to the emergency spillway area & placing temporary cofferdams to isolate the area for excavation

› Several existing piezometers are located near the dam which have recorded water levels in a lower layer of coarse glacial till which is several feet above the existing ground surface

› Given the depth of the excavation below ground surface (~23ft) & the proximity of the subgrade to the lower coarse glacial till layer, there were concerns regarding uplift/heave as the excavation approached its final level

Company: Griffen Fluid Managment

Country: USA

Location: Sanford, Michigan

The Solution

Griffin was initially contacted to review the drawings and geotechnical information for the project and provide feedback regarding potential dewatering measures for the LLO excavation. It was determined that a pilot pumping test utilizing eductors would be beneficial for verifying the effectiveness of the system for lowering the piezometric level along with providing valuable information regarding the aquifer parameters for flow estimations.

› Griffin mobilized to the site and installed a single eductor well along with a series of piezometers, running in 2 different directions from pumping well

› A mixture of open-pipe and vibrating wire piezometers were used to assist in verifying the reduction in pore pressure during testing

› The presence of artesian pressures posed an interesting challenge during the installation of the monitoring wells

› Extension pipes were added to all monitoring wells to keep them from continuously flowing groundwater

› Testing was conducted for 72 hours with readings taken both manually and using pressure transducers located in each well

Dewatering Program

Upon completion of the testing, Griffin analyzed the information to determine several aquifer parameters such as transmissivity, storativity, and hydraulic conductivity. This information was utilized to develop a dewatering program that would provide the necessary pressure relief prior to the excavation. Several groundwater models were also prepared using this information to help predict the influence of the nearby river and the unique geology and dewatering alignment for the project.

Ultimately a dewatering program was prepared by Griffin which required several levels of approval given the risk profile of the project. Once approved, Griffin installed the system as designed and put the system into operation. Additional monitoring wells were also added during the installation and have been used to verify the drawdown levels during the dewatering. After the system was activated, the actual flows and drawdowns very closely mimicked those estimated during the design process using the information gathered during the pilot testing.

The Griffin Difference

Griffin was able to both successfully develop a pilot testing program and an effective dewatering system thanks to the efforts of our engineering and operations teams. Griffin was able to overcome the unique challenges associated with this site and provide

Griffin gathered critical information then applied the findings to design a dewatering program that would provide the necessary pressure relief prior to the excavation.

engineering and consulting services which have allowed the excavation to proceed safely. A great team effort on this project. From Engineering and Design, the Field Crews and the Safety team got this project done right for the client.

The Griffin Difference

Above: Sanford Dam, base drilling.

Fugro-Suhaimi's VHRA

Breaking Barriers, Fostering Safety, and Celebrating Diversity

We at Fugro-Suhaimi have tasked ourselves with redefining workplace safety and fostering a culture of well-being. Through our innovative VHRA (Visual Hazard Risk Assessment) system, we have introduced a groundbreaking initiative that embodies the principles of 3S

Think

Safe,

Work Safe,

and Stay Safe.

This document aims to highlight how FugroSuhaimi's VHRA campaign aligns with these core concepts, fostering a diverse and inclusive environment while prioritizing the health and safety of our employees.

Creating the VHRA System

Fugro-Suhaimi's VHRA (Visual Hazard Risk Assessment) system was conceived by the QHSSE Country Manager Ziyad Alrabeh. Recognizing the limitations of traditional risk assessments in communicating effectively to employees with diverse linguistic capabilities, Mr. Alrabeh and his team developed the VHRA.

Company: Fugro-Suhaimi

Country: Kingdom of Saudi Arabia

Location: Damman

They utilized specialized photo drafting and editing software, conducting site visits to test and refine the system's ability to convey critical information. The VHRA system emerged as an inclusive solution, replacing text-based assessments with intuitive visuals, bridging language barriers, and promoting workplace safety effectively. Through collaborative efforts and employee feedback, the VHRA system evolved into a powerful tool for hazard recognition, risk mitigation, and wellbeing promotion.

Unveiling the VHRA System

The VHRA system, a testament to Fugro-Suhaimi's commitment to safety, diversity, and inclusion, encompasses the essence of "3S – Think Safe, Work Safe, Stay Safe" in its very foundation. By leveraging visual communication, this innovative poster campaign effectively conveys potential hazards, their locations, and mitigation strategies across various work areas.

Through thoughtful design and imagery, the VHRA system encourages employees to embrace the concept of Thinking Safe as they recognize hazards and assess risks without the need for written text

Breaking Language Barriers

In line with the principle of Working Safe, Fugro-Suhaimi's VHRA system transcends language barriers, fostering a cohesive and inclusive workforce. By replacing written text with intuitive visuals and diagrams, the VHRA campaign ensures that safety information can be easily understood by individuals from diverse backgrounds and language preferences. This approach encourages all employees, regardless of their language proficiency, to actively participate in hazard recognition and risk mitigation, creating a collaborative environment where safety is a shared responsibility.

The rolling out of the VHRA campaign showcased a noticeable impact on site-staff enthusiasm for HSE and the 3S principles, particularly among staff

members who were previously shy to speak up vocally about safety matters. Because of the VHRA campaign, staff members now had the confidence to demonstrate their HSE knowledge on site.

This was a significant positive shift in attitude towards not just safety, but themselves. Everyone now felt empowered to embrace the role of a "safety officer" on their respective jobsites.

The “HSE staff” feeling was no longer reserved to the select few; everybody can be HSE now – it became available to all, and every-body was proud of it. This newfound confidence was evident in their everyday interactions, as they actively shared their knowledge, offered suggestions, and took pride in demonstrating their commitment to safety. The campaign fostered an

inclusive environment where everyone felt empowered to contribute to the overall safety of themselves and others, creating a culture of collective responsibility.

Promoting Diversity and Inclusion

The VHRA system exemplifies FugroSuhaimi's commitment to fostering a diverse and inclusive workplace. By embracing the concept of Staying Safe, this initiative encourages active participation and contributions from employees of varying perspectives, experiences, and cultural backgrounds.

It celebrates diversity by empowering individuals to share their unique insights and knowledge in improving safety protocols. In doing so, the VHRA campaign not only enhances hazard identification and risk reduction but also strengthens the sense of belonging and inclusion among our workforce.

Enhancing Well-being

At the core of Fugro-Suhaimi's VHRA initiative lies the principle of Staying Safe, which encompasses employee well-being. By presenting hazards visually alongside mitigation strategies (such as avoiding hazards by barriers, distance, or mitigating risk with PPE), the VHRA posters empower individuals to make informed decisions that prioritize their personal well-being.

This initiative reinforces the message that every employee's health and safety matter, fostering a sense of ownership and responsibility for their own wellbeing and that of their colleagues. By integrating elements of well-being into our safety measures, the VHRA system ensures that our employees can Work Safe while maintaining their physical and mental health.

Driving Continuous Improvement

The VHRA system embodies the principles of "3S" by promoting a cycle ofcontinuous improvement.

Through Thinking Safe, employees are encouraged to provide feedback on the effectiveness of the VHRA campaign, ensuring thatsafety measures are continuously refined and updated to meet evolving needs.

This iterative process fosters a culture of ongoing dialogue, employee engagement, and collaboration, driving our collective commitment to Work Safe and Stay Safe. By embedding "3S" in every aspect of our safety initiative, Fugro-Suhaimi remains at the forefront of innovation, setting new benchmarks for safety, diversity, and inclusion.

Conclusion

Fugro-Suhaimi's VHRA system is an embodiment of the "3S" concept - Think Safe, Work Safe, Stay Safe. Through this initiative, our organization has redefined workplace safety by transcending language barriers, embracing diversity, and prioritizing employee well-being. By fostering a culture where individuals actively participate in hazard recognition, risk mitigation, and continuous improvement,

Fugro-Suhaimi sets a new standard for safety initiatives. As we move forward, we remain committed to the principles of "3S," ensuring that safety, diversity, and inclusion are at the core of our organizational being. Through the VHRA system, we empower our employees to Think Safe, Work Safe, Stay Safe, creating a harmonious and secure work environment for all.

TDI Supports ISMAR12 in Cape Town: A Global Platform for Innovation in Managed Aquifer Recharge

The 12th International Symposium on Managed Aquifer Recharge (ISMAR12) will take place from 28 April to 2 May 2025 in Cape Town, South Africa. As a leading event in the global water industry, ISMAR12 provides a unique platform for industry leaders, researchers, and practitioners to share insights and advance the future of Managed Aquifer Recharge (MAR). TDI is proud to sponsor this year’s event, offering a remarkable opportunity to connect with key players in the field.

An Exciting Programme Awaits

ISMAR12 has received an impressive 150 abstracts, resulting in a dynamic programme featuring oral and poster presentations, interactive workshops, panel discussions, and networking events. The five-day event will kick off with workshops on Monday, 28 April, followed by plenary sessions, parallel technical sessions, and poster presentations throughout the week. Delegates will also have the chance to attend two focused panel discussions, covering critical topics such as "The Microbiome and MAR" and "MAR in Africa".

The symposium will conclude with three exciting field trip options, exploring Atlantis, Cape Flats, and ElandsfonteinLangebaan Road—offering hands-on learning opportunities in these diverse hydrogeological environments.

Interactive Learning Opportunities

A key highlight of ISMAR12 is the array of workshops and in-programme discussions aimed at tackling real-world challenges in MAR. Topics include:

• MAR Scheme Design and Operations

• Technical Solutions for Integrated Water Resource Management (IWRM)

• Advancements in MAR Feasibility NMapping

• American Society of Engineers (ASCE) Standard Guidelines for MAR Design and Operation

Each workshop brings together experts to share insights on the latest developments in MAR science, technology, and engineering, ensuring that attendees leave with practical knowledge they can implement in their own projects.

Networking and Social Events

Beyond technical sessions, ISMAR12 is packed with opportunities to connect and collaborate. Social events include a Welcome Function on Monday evening a Water Tasting Session on Tuesday, and the highlight Gala Dinner on Wednesday night. Between these events, tea and coffee breaks, lunch hours, and poster sessions provide ample time for attendees to network and foster professional relationships.

Looking Ahead

As a sponsor, TDI is committed to supporting advancements in MAR and engaging with this vibrant global community. With the ISMAR12 programme offering unparalleled learning and networking opportunities, we’re excited to play an integral role in shaping the future of MAR. Join us in Stellenbosch for what promises to be an inspiring and impactful event! Registration Link - https://dewateringinst. com/international-symposium-onmanaged-aquifer-recharge/

media and advertising across the continent.Our wide range of publications spans across diverse industries, ensuring that we meet the specific needs of various sectors. With extensive reach and experience, we are well-equipped to address a multitude of requirements.

28 APRIL - 2 MAY 2025 | STELLENBOSCH SOUTH AFRICA

Sand drains and deep wells at I35

Keller installs passive sand drains and depressurization deep wells along Interstate 35W as part of the larger I-35 W Stormwater Storage Facility GMGC project.

Introduction

Heavy rainfall and continued land development have caused an increase in significant flooding events on I-35, and the Minnesota Department of Transportation (MnDOT) was seeking a solution.

Over 160,000 vehicles travel on I-35 a day through Minneapolis. During flood events, these travelers face traffic delays or lane closures. In some instances, the existing storm drainage system surcharges and causes geysering of the lids of the access shafts due to the high pressures, causing full highway closures.

A stormwater solution

Working with its design team, MnDOT’s solution to managing stormwater and flooding consisted of building a new underground stormwater facility with a capacity of over 4.5 million gallons.

The facility was constructed along the shoulder of I-35 and consisted of six interlocked cylindrical stormwater storage tanks built inside diaphragm wall shafts. The tanks were designed to accommodate a six-year flood event by storing water while the existing drainage system gradually released it into the Mississippi River.

The tank construction required an excavation of over 36,000 cubic yards, with depths up to 95 ft.

Keller’s involvement

Keller was contracted to provide passive sand drains and depressurization wells. When properly constructed, predrainage dewatering and depressurization dewatering systems eliminate the migration or erosion of the native soils and permit excavation in the dry without blow-in from below.

Pre-drainage dewatering physically drains soil, while depressurization reduces the groundwater pressure from underlying strata. Both groundwater control methods prevent the failure or ‘boiling’ of the invert in a deep shaft excavation, which is the probable root cause of a catastrophic and fatal disaster.

Company: Keller-NA

Country: USA

Location: Minneapolis

In phase one of the dewatering work, Keller was responsible for drilling and installing 42 passive sand drains. Seven were interspersed around the interior perimeter of each of the six proposed storage tanks, and one was in the center of each.

In phase two of the dewatering work, Keller was responsible for drilling, installing, and furnishing 40 depressurization deep wells interspersed around the exterior perimeter of the six proposed storage tanks.

The storage tanks measured approximately 47 ft in diameter and extended from working grade to approximately 95 ft deep. A diaphragm wall around each storage tank perimeter supported the excavation for the storage tanks. The sand drains were intended to allow groundwater to drain from within the diaphragm wall once the dewatering system was activated and excavation commenced.

The anticipated geology generally consisted of silty, clayey, and poorly to well-graded sand. Groundwater was measured between approximately 4 and 9 ft below the existing grade. Layer 4C of the anticipated geology, in which the depressurization wells were screened, comprised very dense glacial deposits of poorly graded sand to silty sand. Numerical analysis of a pump test previously performed at the site indicated that the horizontal hydraulic conductivity of layer 4C was between 318 and 657 GPD/ft2, and the vertical hydraulic conductivity of layer 4C was between 0.45 and 430 GPD/ft2.

However, Keller encountered unexpected subsurface formation issues that differed from the continuous, homogeneous formation that was anticipated. The unusual ground conditions caused sudden and significant loss of drilling fluid below 150 ft on half of the installed depressurization wells.

The impacts Keller experienced, including rapid fluid loss at a consistent elevation and borehole cave-in up to the ground

surface, indicated a previously unreported feature or rock property below the depth of previous exploratory borings in the work area. Keller continued working toward completion of the drilling through the unanticipated formation issues and implemented drilling techniques to best address the differing site conditions.

Drilling rigs

For both the sand drains and depressurization well installations, Keller implemented two drill rigs and two drill crews working simultaneously to make production as efficient as possible. All rigs maneuvered well in the tight work areas and reached the required depths of the boreholes, which were up to 170 ft deep. These rigs were determined to be viable options for best applying the required drilling techniques while optimizing manpower, equipment, and the available space.

Sand drain drilling and installation methods

Before the proposed storage tanks were excavated, all 42 passive drains were installed from the working grade using open-hole mud rotary drilling methods. An approximate 16-inch diameter borehole was drilled to a target depth of approximately 135 ft. Clean water and biodegradable drill mud were mixed in the borehole to aid with drilling and borehole stability.

After reaching the target drill depth, the borehole was flushed using clean water until the drilling fluid appeared clear to the unaided eye. Clean filter sand was then poured into the water-filled borehole. The sand's uniform gradation permitted it to be placed without a tremie. The sand was added until roughly 45 ft of open borehole remained, or higher, as determined in the field.

As the excavation progressed, the sand drains were removed to the bottom of the excavation. The portion of the passive drain below the excavation remains in place today. The passive drains were not regulated as wells and did not need to be abandoned.

Depressurization deep well drilling and installation methods

Before the excavation of the proposed storage tanks, all 40 deep wells were installed from the working grade using various drilling methods. Keller’s initial approach to the project was to use open-hole mud rotary drilling methods.

Based on the expected geology, this method would be suitable and efficient to install the depressurization wells. However, due to the differing site conditions, rapid fluid loss, and borehole cave-in, Keller shifted their approach to air hammer drilling as a second drilling method. This alternative assumed that the geology was more competent rock than originally expected. However, Keller continued to encounter gravel and highly fractured bedrock materials which are both materials that do not provide enough resistance to keep an air hammer firing properly.

Keller eventually switched to duplex drilling methods. Each borehole was cased during drilling to best prevent cave-in and fluid loss.

An approximate 16-inch diameter borehole was drilled to a target depth of approximately 165 ft deep. Clean water and biodegradable drill mud were mixed in the borehole to aid with drilling and borehole stability.

After reaching the target drill depth, a 10-inch diameter well assembly was set in the borehole. The well was screened with a wire wound, high-capacity screen. Additionally, each well included a 10-foot sump at the bottom of the borehole. The pump was set in the sump such that the pump intake was below the bottom of the screen to maximize potential drawdown in the well. The well casing was extended approximately 1 ft above the working grade.

A filter pack was poured into the annular space of the borehole and well screen. The uniform gradation of the filter pack permitted it to be placed without a tremie. Filter material was added until the top of the filter pack was at least 2 feet above the top of the well screen. The remainder of the borehole was filled with cement-bentonite grout to the ground surface. The purpose of the filter pack was to prevent the pumping of any fines/ sediment from the formations.

After wells were constructed, each was developed by surging with compressed air. Clean water was added to the deep well to assist with the development process. Each well was pump tested, and the effluent was tested to ensure the well was not pumping excessive fines. Additionally, 24 hours after activation of each deep well, the effluent was tested again to ensure the well was not pumping excessive fines (> 10 ppm). If a well was found to pump fines more than 10ppm, the pump was removed and the well redeveloped.

Following development, a submersible pump was installed in each well. The 40 HP pumps were capable of pumping 505 gallons per minute at the required head. The pumps were controlled with variable frequency drives (VFD) and NEMA 3R surface-mounted control panels for each well. Each control setup included a line reactor to protect the VFD and motor from power surges. A pressure transducer in each well drove the VFD to change the pump output to maintain an agreed-upon water level within the well. Each pump required 52 running amps at 480 volts, three-phase.

The pump column was to be suspended approximately 1 foot off the bottom of the well by a stainless-steel cable secured to the top of the well casing. A jacketed submersible electrical cable rated for full immersion connected the pump to a pump control panel mounted next to each well. The discharge from the pump was a 6-inch diameter SCH80 PVC solvent welded pipe. A wellhead made up of a throttling valve, sampling port, by-passport, and check valve was constructed for each well.

A common discharge manifold (two discharge pipes total) was installed on the east and west sides of the excavation. The discharge manifold consisted of HDPE piping and fittings with a maximum diameter of 16 inches, connected with fusion methods. Discharge from the system was routed to the existing I-35W storm drain at the 42nd St. bridge.

Clarke Creek Pump Station

Huntersville, North Carolina

Project Summary

In this project near Huntersville, North Carolina, Griffin undertook dewatering the construction of a new pump station under challenging conditions. The pump station itself measured 37 feet by 31 feet and extended over 52 feet below ground surface.

The project site posed difficulties due to a shallow static groundwater table, only 11 feet below the surface, necessitating extensive dewatering efforts to facilitate safe and efficient construction.

Griffin provided a comprehensive turn-key solution for the project, handling all aspects from dewatering permitting to design, submittal, and installation. Given the stratified soils and low anticipated hydraulic conductivity of the area, Griffin devised a specialized eductor system. This system was designed to encircle the excavation area, which combined open-cut and H-pile lagging methods.

The eductor wells were drilled to depths reaching 60 feet below the surface elevation, effectively lowering the groundwater level to 5 feet below the excavation bottom.

Company: Griffin

Country: USA

Location: Huntersville, NC

Duration: 2023 – 2024

Operating at a capacity of 65-90 gallons per minute (GPM), the eductor system played a crucial role in meeting the demanding construction schedule by efficiently dewatering the site.

The Challenge

A deep 50+-foot excavation with H pile with lagging was required for this project. Highly stratified soils and underlying saprolite, silts, and clay caused difficult dewatering conditions and the risk of groundwater infiltration into the planned excavation. The soil density also increased dramatically with depth, therefore specialized sonic drilling equipment was required to install the eductors to the designed depth.

The Solution

Griffin designed and installed an eductor dewatering system to lower ground water to over 55-feet below grade. Single pipe eductors were drilled and completed to 60-feet below grade to ensure groundwater levels would be below the total depth of the excavation. Griffin was also able to confirm the design parameters by performing a pumping test after the first several eductor wells were installed. The dewatering system produced approximately 65-90 GPM and lowered the groundwater elevation to allow for a successful project with limited sumping.

The Griffin Difference

Griffin's expertise in dewatering was evident in their optimized design tailored specifically for the challenging hydrogeological conditions of the site. Their comprehensive approach ensured that the project could proceed smoothly and safely, overcoming significant groundwater challenges through effective engineering and project management.

What did the Client Say?

"Thanks guys - We appreciate your service on this project and definitely look forward to the next one. From the design to the installation to the service, you guys are the best. Keep up the good work!"

A. Merritt, Project Manager, State Utilities Contractors

Riverton Aquifer Treatment Project

Keller provides four phases of water treatment for a master-planned community.

Introduction

After decades of industrial activity use across a 400+ acre waterfront site, the area claimed a new purpose of a 6.5 million sq. ft. master-planned community. Stretching along the Raritan River, the site will include retail and entertainment space and over 2000 residential units. Left with a contaminated pond system and groundwater after years of industrial use, a groundwater treatment solution was required throughout construction, reducing total suspended solids and dissolved metals.

Initial system and modifications

The project schedule was split into four phases based on site logistics and to limit interruptions. During the first phase, Keller installed and operated a treatment system that could handle flows up to 300 gallons per minute (GPM). While successfully treating the water and meeting permit limits, the system needed modifications to handle higher flows up to 1,000 GPM to treat and discharge water without exceeding permit effluent limits.

With inputs from chemical suppliers and process vendors, Keller developed a more efficient approach. That approach was put into action for Phases 2, 3, and 4, where Keller installed and operated a much larger temporary water treatment system, able to process and treat water from the pond system with a maximum flow rate of 1000 GPM.

The modified system and how it works

The system consisted of:

• Transfer pumps

• pH adjustment systems

Company: Keller-NA

Country: USA

Location: Riverton

• polymer injection systems

• inclined plate clarifier units for enhanced settling

• sand and bag filtration

First, the system raises the water's pH with sodium hydroxide to precipitate and flocculate metals. The metals are then coagulated with an anionic polymer. Next, an inclined plate clarifier settles the coagulated metals and suspended solids. The pH is lowered to within discharge limits by adding sulfuric acid before filtration and discharge. Finally, the treated water is discharged into a culvert, draining into the adjacent river.

Flocculation and coagulation

The purpose of flocculation and coagulation is to enhance the settling of solids contamination in the turbid influent water. The suspended particles are most effectively removed when they flocculate or clump together) in groups. An anionic polymer is then added to the water to coagulate, thicken and gather, those particles into a large mass that will settle more rapidly. During phases 2, 3, and 4, an inclined plate clarifier was added to settle the coagulated solids, vastly improving the treatment process with higher flows. The sand and bag filtration removed any remaining solids after using the plate.

System maintenance

The use of various chemicals along the treatment train and the high flows complicated the system's operation and maintenance.

Keller’s qualified water treatment technicians have operated the complex system during all phases, with a strong focus on the

crew's health and safety. Through daily meetings to review project objectives, onsite teams identified potential hazards. Specialized equipment was used to maintain safety, and detailed plans were developed and implemented to achieve project goals.

Treatment success

During the four phases of treatment, 65 million gallons of water were processed and treated with minimal downtime during operation. The fourth phase was very successful. Tweaking the treatment process and adding new equipment has proven effective in handling the highest flows possible for treatment, with an average of 500,000 gallons per day of water treated and discharged.

Keller successfully treated anddischarged water per the permit and contract requirements along with client satisfaction. Crew hours to date are over 14,400, which have been performed safely and without any safety incidents. Throughout the project, Keller had to consider several factors that affected the influent water chemistry and subsequent treatment methods, including temperature, precipitation, and depth of the pond.

The constant change in water chemistry required continuous monitoring and changes to chemical dosages and other operational details of the treatment system.

The success of the project is based on team effort, from excellent project

coordination, collaboration, and communication between Keller personnel, contractors, and vendors/ suppliers to exceptional system performance with experienced technicians.

Over 160,000 vehicles travel on I-35 a day through Minneapolis. During flood events, these travelers face traffic delays or lane closures. In some instances, the existing storm drainage system surcharges and causes geysering of the lids of the access shafts due to the high pressures, causing full highway closures.

A stormwater solution

Working with its design team, MnDOT’s solution to managing stormwater and flooding consisted of building a new under-ground stormwater facility with a capacity of over 4.5 million gallons. The facility was constructed along the shoulder of I-35 and consisted of six interlocked cylindrical stormwater storage tanks built inside diaphragm wall shafts. The tanks were designed to accommodate a six-year flood event by storing water while the existing drainage system gradually released it into the Mississippi River. The tank construction required an excavation of over 36,000 cubic yards, with depths up to 95 ft.

With a strong foundation in hydrogeology and a focus on dewatering and groundwater management, Niel's career spans multiple regions, from Africa to the Middle East, and now Australia. His commitment to environmental stewardship and operational efficiency aligns with TDI's mission to promote knowledge sharing and industry advancement.

Can you tell us more about your work history and how you got into the dewatering industry?

My journey in dewatering started as a geology vacation student in Zambia’s Copper Belt, where I first encountered groundwater and mine dewatering. After completing my undergraduate studies in geology, I pursued an honours and master’s in hydrogeology while gaining hands-on experience through hydro and geophysical investigations. I then took on a role in Qatar as a dewatering design engineer, which exposed me to extensive dewatering work during the country's rapid expansion.

After moving to Australia, I became a consulting hydrogeologist, supporting dewatering projects around Perth.

Niel Kriel

I’d highlight the need for better knowledge sharing and engagement across the industry. These improvements could help streamline operations and reduce repetitive challenges.

Why do you think TDI is important for the industry, and how can it help the industry develop?

TDI provides a platform for professionals worldwide to exchange ideas and solutions. Challenges that one team faces today may have been solved elsewhere. TDI’s commitment to facilitating this exchange strengthens the industry and helps all of us move forward.

What was the greatest encouragement someone gave you regarding business?

“If you don’t know, ask.” This advice has guided me through many projects and continues to encourage a mindset of constant learning.

What is your life motto?

Appointed as TDI Advisory Council Member “ ”

Question everything. The very foundation of science is to keep the door open to doubt.

- Carlo Rovelli.

This curiosity has been essential to my work.

As a participant of the TDI Awards judging committee, what are your impressions of this year’s entries? Do you think businesses benefit from participating in such events?

The entries showcased impressive innovation, with many projects prioritising reduced impacts and improved performance. It was inspiring to see the focus on supporting young engineers and scientists. Events like the TDI Awards not only highlight individual achievements but foster the mentorship and knowledge sharing crucial for our industry’s future.

Niel Kriel, Operations Hydrogeologist at Rio Tinto, Perth, Western Australia, brings a wealth of knowledge and a global perspective to his new role on TDI's Advisory Council.

Today, as an operations hydrogeologist in the Pilbara, I manage in-pit dewatering and groundwater operations. Each location and aquifer system has brought unique challenges, from managing drawdowns to navigating regulatory restrictions.

What are your favourite projects that you’ve worked on in your career?

Each project has contributed to my professional growth in its way. A few standouts include Al Sa’ad Plaza in Lusail, Qatar; the ECU City Campus project in Perth; and my ongoing work with the Greater Nammuldi project.

What are some of the biggest challenges you’ve seen in the industry?

One consistent challenge is the accountability and management of dewatering discharge. Regulations around water discharge are increasingly strict, affecting where and how much water can be safely discharged. Every project must navigate this landscape, often requiring innovative solutions.

How have you seen the industry develop over the past decades?

While I haven’t yet observed decades of change, I’ve seen the field evolve to

emphasise hydrogeological insights. The approach has shifted from simply drilling and pumping to conducting detailed investigations that predict system responses more accurately.

How do you see technology playing a part in the industry in the future?

Dewatering is well-positioned to benefit from advancements in technology. Today, we can monitor bore output and groundwater levels in real time, often from remote locations. This data integration enables dynamic modelling and forecasting, and I expect these tools to become even more sophisticated, further enhancing efficiency and response times.

Why would you recommend younger generations a career in the dewatering industry?

Dewatering is a universal field—whether it’s constructing infrastructure or mining, water management is essential. The industry offers diverse opportunities and attracts like-minded professionals who thrive on overcoming technical and regulatory challenges.

What aspects of the industry do you think need improving?

Above: Niel Kriel

Watering the Wells of Our Minds: Mental Wellness in the Workplace

Author: Lerato Solomon

If life were a restaurant, mine didn’t come with a menu. From an early age, I was served chaos without asking, forced to figure out the ingredients and whether they were edible. My first encounter with despair came when I was just ten years old- my first out of four suicide attempts. The overwhelming weight of the world crushed my small shoulders, and I attempted to silence it all by trying to end my life. Over the years, I faced that darkness three more times. Chronic depression and I became reluctant companions, a dance I couldn’t seem to stop. But this isn’t a story about surrender. It’s a story about watering our wells—both literal and metaphorical. Because like the groundwater beneath our feet, our mental wellness is often unseen but absolutely vital.

Imagine a serene body of water—calm, clear, and vital. Then, someone tosses a stone. The ripples spread, disrupting the stillness, their effects visible far beyond where the stone landed. That stone could be workplace stress, unresolved trauma, or the relentless pressure of life. And the water? That’s your mental health.

As a development practitioner, founder of Mental Matters, and someone who has navigated the uninvited storms of chronic depression, I’ve come to realize that mental health isn’t a problem reserved for other people. It’s our problem. It touches the overworked intern trying to prove themselves, the manager quietly shouldering unspoken burdens, and the parent balancing project deadlines with a teething baby. It’s also me.

How often have you said, I “pushed through” but at a cost of your wellbeing?

I remember when whispers in the workplace questioned my commitment after taking leave for my mental health, I stayed silent.

And when depression knocked on my door for the fourth time, I simply let it in, too exhausted to fight. But here’s what I’ve learned: pushing through isn’t always resilience or healing, and staying silent doesn’t save you.

Without addressing our inner turmoil, we risk running dry trying to water the wells of our lives with nothing but dust.

Mental Wellness Isn’t a Tick-Box Exercise

Let’s be honest: most workplace wellness initiatives feel more like PR strategies than real support systems. There’s the annual wellness day with smoothies and yoga mats, the anonymous hotline tucked into an HR handbook, or a chirpy email about “achieving work-life balance.”

But none of these address the deep, messy, very human nature of mental health. Real mental wellness in the workplace isn’t about checking boxes; it’s about building a culture where people feel safe to be human. Where someone can say, “I’m not okay,” without fearing judgment or whispers of weakness.

I’ve been in workspaces that fell short. I’ve seen the cost—not just in morale but in the bottom line. Mental health issues cost the South African economy R161 billion annually in absenteeism, presenteeism (working while unwell), and lost productivity. Yet only 27% of people with mental health conditions in South Africa receive treatment. It’s not enough to acknowledge these stats during Mental Health Awareness Month and move on. Addressing mental health requires genuine commitment.

Leading with Compassion

In one of my roles, I work with a lot of social impact projects involving underserved communities. These experiences taught me a critical lesson:

Humanity is a powerful tool. It disarms us, connects us, and makes difficult conversations approachable. I often say, “Mental health days are like WiFi-everyone needs them, but not everyone knows how to ask for them.”

When we humanise mental health discussions, we dismantle the stigma that keeps so many people silent. We recognise that people are simply just human before anything else; before being a mom, dad, the CEO, the manager or whatever hat you wear.

Watering Your Own Well

So how do we water our wells in a world that’s constantly draining us?

• Set Boundaries: Saying “no” doesn’t make you less committed—it makes you sustainable. Remember that boundaries protect your values.

• Seek Help: Therapy isn’t for “broken” people; it’s for people who want to stay whole.

• Inclusion and Diversity: If you hold a position of influence, strive to create policies that genuinely benefit everyone—from the cleaner and receptionist to the executives. Remember, we work with people, not just numbers to report on.

For organizations, remember:

a thriving workplace isn’t built on perks like free coffee or bean bags in thebreakroom. It’s built on trust, empathy, courageous conversations and a genuinecommitment to wellness.

Let’s Keep the Conversation Flowing

As you read this, ask yourself: Are you watering your own well? Are you helping others water theirs?

Together, we can rewrite the narrativeone well-watered mind at a time.

Looking for a speaker who brings heart and hard truths to the table?

I’ve shared my journey at national seminars, global spaces, communities and intimate team workshops. My talks inspire action, build empathy, and create lasting change.

Let’s talk about mental health in a way that resonates, empowers, and transforms.

Reach out to work with me today.

Because mental wellness isn’t a luxury - it’s a human right.

people flourish when they feel seen and supported. The same principle applies in workplaces.

Compassion isn’t just a leadership qualityit’s a superpower. Imagine a manager noticing an employee’s uncharacteristic behaviour and saying, “I’ve noticed you’ve been quiet lately. Are you okay?”

That simple act of care can stop a downward spiral.

Compassionate leadership isn’t about lowering expectations; it’s about creating environments where people can meet them without losing themselves. When we prioritize mental health, we reduce burnout, boost productivity, and—most importantly—build happier, healthier teams.

I remember returning to work after taking leave for my mental health. The atmosphere was icy. Rumours swirled: “She’s taking advantage.” “She’s weak.” I walked in, bracing for impact, feeling more like a liability than an asset.

But then, one colleague changed everything. She pulled me aside and said, “You don’t owe anyone an explanation. Your health is valid, and it does the business no good if you are not well.” That moment of kindness shiftedmy perspective. It reminded me that compassion and empathy aren’t just a feel-good concept—it’s transformational.

Humanity: Breaking the Stigma

Let’s address the elephant in the room: talking about mental health can feel heavy. But it doesn’t have to. One of my favourite moments during a workplace wellness workshop was when a participant said, “Lerato, I came here expecting this to be depressing, but you made it okay to just be human and normalise struggles.”

• Find Your Tribe: Surround yourself with people who recharge youpersonal, professional and social.

• Celebrate Small Wins: In a world where the “grind and hustle” are glorified, burnout can often be seen as a success result but remember that’s not it. Take stock, tough day? Got through it? Got rest? That’s a win. Treat it as one.

I’d love to continue this conversation with your team, your community, or your organization. Through Mental Matters, I offer talks, workshops, and actionable strategies to create environments that are as compassionate as they are productive.

Let’s create spaces where mental health isn’t a whisper but a courageous, ongoing dialogue.

Photo: Nik Shuliahin, Unsplash

Unifying the Global Dewatering Community:

The Dewatering Institute's Mission and Vision

At its core, The Dewatering Institute exists to unite professionals and organizations across the dewatering and groundwater control industry. Through education, collaboration, and innovation, TDI serves as a global hub for sharing expertise, promoting best practices, and driving advancements within the sector.

TDI’s Mission Statement

TDI is dedicated to fostering collaboration and innovation in the dewatering and groundwater control industry by providing a platform for education, networking, and knowledge sharing and best practices. We aim to empower professionals to meet current challenges, advance sustainability, and set new benchmarks for excellence worldwide.

Fundamentals of TDI

TDI operates on four fundamental pillars: Education, Knowledge Sharing, Best Practices, and Networking. These guiding principles translate into tangible benefits for members and the broader industry, including:

• Educational initiatives: Webinars, training courses, concise guides, and continuous professional development.

• Knowledge-sharing opportunities: Case studies, industry-specific insights, and collaborative discussions.

• Best practices: Promoting innovative and sustainable solutions through resources and guidelines.

• Networking: Connecting professionals through events, newsletters, and social media outreach.

By focusing on these fundamentals, TDI ensures that its members have the tools they need to grow professionally while making a meaningful impact within the industry.

TDI Advisory Council

The TDI Advisory Council is composed of leading experts from diverse disciplines within the dewatering and groundwater industry. These professionals provide valuable insights to ensure TDI remains at the forefront of industry developments.

This year, we are excited to welcome Niel Kriel from Rio Tinto to the Advisory Council. With extensive experience in mining and groundwater management, Niel brings a wealth of knowledge to the team. His appointment reflects TDI’s commitment to representing diverse perspectives and addressing the industry’s evolving needs.

The AdvisoryCouncil continuestoprovide strategic guidance, ensuring TDI stays true to its mission while offering unparalleled support to its members.

TDI Members: A Global Community

TDI’s vibrant community comprises members from all corners of the world, representing a wide range of disciplines and expertise within the dewatering and groundwater sector.

We are proud to recognize our founding members, who have been instrumental in shaping TDI’s vision and foundation:

• Griffin Dewatering LLC

• Roscoe Moss Company

• Van Tongeren Watertechniek

• Carl Hamm Pipes and Pump Solution

• Stuart Wells Ltd

• Hölscher Group

• Hydroserv International

• Layne, a Granite Company

• Keller North America

With a steadily growing member base, TDI is now home to an international network of contributors, company members, and individual professionals. Together, this global community fosters collaboration, innovation, and growth within the industry.

Future Plans: Expanding Horizons

TDI is committed to remaining an active and engaged organization within the global dewatering community. A key part of this commitment involves direct engagement with members through conferences, workshops, and industry events.

In 2024, TDI participated in the 75th Anniversary Groundwater Festival, hosted by Van Tongeren Watertechniek in the Netherlands. This event provided an invaluable opportunity to connect with international members, exchange ideas, and reinforce TDI’s dedication to fostering global collaboration.

Looking ahead, TDI plans to participate in at least one international conference or workshop annually, with the goal of expanding its reach and strengthening relationships with its members. With many of our members based in the United States, we are exploring the possibility of hosting future events in this region.

Why become a TDI member?

Joining TDI means becoming part of a thriving global network of dewatering professionals and organizations. As a member, you gain access to a wealth of resources, including:

• Industry-leading case studies, guides, and professional development opportunities.

• Networking with experts and peers from diverse disciplines within the sector.

• Educational webinars, hybrid events, and in-person training tailored to your needs.

• A platform for sharing your expertise, building your brand, and showcasing your achievements.

TDI is dedicated to meeting the needs of its members, which include project owners, engineers, contractors, manufacturers, suppliers, and government entities. By joining, you’ll have the chance to make meaningful connections, enhance your knowledge, and contribute to the growth of the dewatering and groundwater industry.

Join the TDI Community

Are you ready to become part of this dynamic and innovative community? For more information or to register as a member, contact TDI at admin@dewateringinst.com

Together, we can advance the industry, one step at a time

TDI Member Distribution

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TDI Member Testimonials

TDI provides a platform for professionals worldwide to exchange ideas and solutions. Challenges that one team faces today may have been solved elsewhere. TDI’s commitment to facilitating this exchange strengthens the industry and helps all of us move forward.

Mark Claassen - Regional Director, Tunnel Construction Management, East USA at Hatch

TDI provides an industry forum for sharing of knowledge related to construction dewatering. This forum promotes continuous learning and the sharing of best practices throughout the industry.

It's remarkable and highly beneficial that a relatively small and specialized sector like TDI is globally interconnected through The GEM. Not only is it delightful to engage with peers from across the globe, but it's also incredibly valuable and motivating to exchange insights and experiences. TDI genuinely facilitates the sharing of worldwide knowledge, enhancing the work at Fugro. The TDI awards ceremony highlighted once more that colleagues around the world are diligently working at a high level to ensure the creation of safe and dry construction sites through passion, effort, innovation, and the involvement of the younger generation.

The value that GEM magazine brings to the groundwater industry is immeasurable. It shines a muchneeded spotlight on the innovations, people, and projects that are driving progress in the sector. Being featured in the magazine has provided both insight and opportunity, and it’s truly a privilege to be associated with such an informative and forward-thinking publication.

Greg Ziegler - Keller NA

GEM is a great resource for those individuals and companies that operate in the construction dewatering industry to share ideas and technologies from around the world. It is interesting to understand what the leading companies in the global dewatering industry are encountering through TDI’s educational webinars and the sharing of best practices and project summaries in the GEM magazine.

Robert Hoddenbach – Global Director Climate and nature at Fugro.

Fugro is very proud to become a Company Member of The Dewatering Institute. We are one of the largest Geo-data companies in the world and have developed unique solutions for hydrogeological modelling and site investigation. Fugro is excited to connect with TDI.

TDI gives us a stage to showcase the work we do and innovative ideas from other companies around the world. We need to share these ideas to help in developing our industry.

Jeroen November - Hydrogeologist - Business Developer at iFLUX

Knowledge sharing and networking are important in a sector like the dewatering industry, given the current and future challenges to take into account (pollution, climate change, population increase). To me it’s like a global think tank where ideas may originate & be further developed regionally there where applicable.

Andres Pinto - Regional Technical Lead – Ground Engineering at Stantec.

The Dewatering Institute is important for the industry since it provides an open platform to share knowledge, industry best practices, case studies and to promote networking opportunities between its members. Collaboration between TDI members from a worldwide network will be a key aspect to develop the dewatering industry business in the future.

Niel Kriel - Operations Hydrogeologist at Rio Tinto

Volkert Lubbers - Geohydrologist at Fugro

Chris Munnich - Carl Hamm PPS

Bas Davies – Project Leader at Henk van Tongeren Water & Techniek

Did you know?

DID YOU KNOW?

It’s estimated that there is 236 million, trillion gallons of water on earth

DID YOU KNOW?

The soil beneath your feet holds the key to clean water

DID YOU KNOW?

The construction of the Burj Khalifa, the world’s tallest building, involved significant Dewatering efforts to handle the high-water table and ensure the buildings stability

DID YOU KNOW?

Effective soil moisture monitoring can improve water use efficiency by up to

DID YOU KNOW?

Water links us to our neighbor in a more profound and complex manner than any other resource

DID YOU KNOW?

Groundwater is a key part of the water cycle: It replenishes surface water, like rivers, lakes, and wetlands

DID YOU KNOW?

Groundwater is the world's most abundant freshwater source: Although it makes up less than on Earth, groundwater is the primary source of fresh water for humans

DID

YOU KNOW?

Groundwater can be tracked from space: NASA uses satellites to measure changes in gravity to track groundwater movement

DID YOU KNOW?

Groundwater is Human activities can pollute and overuse groundwater

DID YOU KNOW?

44% of the U.S. population depends on groundwater for its drinking water supply

DID YOU KNOW?

70% of the total groundwater withdrawn globally is used in the agricultural production of food industrial crops like cotton, livestock, and fabrics

Masters of dewatering