Flooding Integrated engineering for resilient flood management across the UK and Ireland
Engineering | Programme Management | Consulting
Contents
About Ayesa Engineering
4
Our Approach
6
Sector: Flooding
8
Specialist Expertise
10
Sub-sectors Catchment Area Planning and Hazard Mapping
12
Flood Resilience Planning
14
Flood Risk Assessment (FRA) and Management Plans (FRMP)
16
Flood Relief Schemes
18
Hydraulics, Hydrology and Hydromorphology
20
Projects
22
4
Flooding Brochure / About Ayesa Engineering
About Ayesa Engineering A global leader in engineering services
Top 50 International engineering design firm
20+ Countries (active in)
€312m+ Revenue
1966 Established
3,400+ Professionals
70+ 40+ Skill sets
11 Offices in UK and Ireland
For almost 60 years, Ayesa Engineering’s multidisciplinary teams have successfully delivered significant large-scale projects worldwide while staying true to their guiding principles of “making it happen”. Today, the company is a global provider of engineering services, specialising in over 40 disciplines and with an active presence in 20+ countries. Ayesa Engineering’s expansion into various sectors and geographic locations has played a significant role in its growth, ultimately leading to its position as one of the 50 largest engineering firms globally. In 2025, Ayesa Engineering grew to 3,400 professionals united in the shared goal of developing solutions that foster a new, improved, sustainable and digitally-oriented world. World Rankings #43
ENR 2025 Top 225 International Engineering Design Firms
#56
ENR 2025 Top Global 150 Design Firms
#61
WA100 2026, Building Design Top Architects
#18
Geplus.co.uk Top 50 Geotechnical Consultants (UK) 2025
ENR 2025 Top International Design Firms (sector) #24 Transportation
#14 Water Supply
#20 Marine & Port
#50 Sewer & Solid Waste
#38 Oil & Gas
#35 Industrial Process
#18 Highways
#11 Rail and Mass Transit
#18 Water Treatment
Flooding View Sector >
Water and the Environment
Geoscience
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// Catchment Area Planning and Hazard Mapping // Flood Resilience Planning // Flood Risk Assessment (FRA) and Management Plans (FRMP) // Flood Relief Schemes // Hydraulics, Hydrology and Hydromorphology
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Marine and Coastal
Energy
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// Ports and Harbours // Marine Structures // Coastal Modelling and Engineering // Marinas and Waterfronts // Subsea Pipelines // Environmental Assessments and Planning // Offshores Renewables
// Solar Energy // Onshore and Offshore Wind Power // Biomass // Hydroelectric Power // Hydrogen and Renewables Gases // Energy Storage // Thermal Generation // HV Transmission and Distribution
// Airports // Bridges and Structures // Highways and Roads // HSL, Railways // Land Management // Metros, LRT and Tramways // Stations and Terminals // Transportation Systems // Tunnels and Underground Spaces
Buildings and Cities
Oil and Gas
Industry
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// Arts and Culture // Education // Healthcare and Research // Heritage and Flooding // Office and Commercial // Residential and Hotels // Sports and Leisure // Technology and Data Centres // Urban Planning and Landscaping
// Liquefied Natural Gas (LNG) // Pipelines // Production Facilities // Refining Facilities // Storage and Terminals
// Logistics Plants and Distribution Centres // Metallurgical and Transformation Plants // Agri-Food Plants // Mining Facilities // Chemical and Petrochemical Plants // Yeast and Life Sciences
// // // //
Environment and Sustainability Flooding and Rivers Waste Management Dams, Reservoirs and Major Water Infrastructure Drainage, Groundwater and Irrigation Water Conveyance and Distribution Water Resource Management Water Treatment and Desalination
// Urban Geotechnics // Infrastructure Geotechnics // Engineering Geology // Underground Space // Site Investigation // Land Quality and Regeneration // Surface Water and Groundwater Risk Assessments
Transportation View Sector >
6
Flooding Brochure / Our Approach
Our Approach An End-to End Partner Lasting Positive Impacts We offer the highest standards of design, project management and stakeholder collaboration to realise optimum project solutions. Our engineering consultants are among the very best in their fields. Continuous involvement in challenging projects maintains and enhances our high standards of technical excellence.
People Centric We invest in our staff to deliver a positive, enriching, safe and empowering work experience at Ayesa Engineering. We are committed to equality, diversity and inclusion to provide a place where everyone can thrive. We invest significantly in training and development to keep our staff at the cutting edge of their industry. Our focus is on positively influencing those SDGs most applicable to us in our role as a leading engineering consultant. Everything from CO2 emissions, water reduction, social value, health and wellbeing, community engagement, apprenticeships, and safe working.
Our company is built on relationships and superior client care. We deliver on our unwavering commitment to assist our clients in achieving their desired results. We are agile and responsive and build a collaborative framework across stakeholders for project success.
Bridging the Gap We are seasoned in managing projects and supervising construction phases of projects across the project lifecycle. We help clients “bridge the gap” across all relevant stakeholders within a project. We seek to understand the needs, constraints, opportunities and to optimise solutions.
Proven Track Record We have extensive experience across a broad range of sectors. We currently sit on a number of frameworks, such as Irish Water, Port of Cork, Oil and Pipeline Agency, Waterways Ireland, Gas Networks Ireland, Irish Rail, Fusion 21 and Translink.
Utilising Relationships Getting a project off to the right start and mitigating any delays helps to keep costs down - Our team has forged close working relationships with environmental authorities and regulators throughout the regions we operate in, enabling us to expeditiously progress projects through the permitting, construction, verification and site closure.
Client Focused Our culture focuses on developing strong working relationships with clients who continue to work with us based on the value we provide. Our clients are in both the public and private sector and range from major companies and national regulatory organisations to smaller regional organisations providing optimum solutions for significant infrastructure projects and local sites.
Innovation and Sustainability
Technical Excellence
We offer innovation with a deep understanding of environmental issues such as climate change and sustainability, waste to energy, renewables to deliver maximum value to clients.
We keep our clients informed of the implications of legislative changes to their businesses and manage stakeholder engagement to help progress projects in a profitable yet environmentally compliant manner. Our proactive approach helps you to benefit from our expertise in a constantly changing regulatory environment.
Safety First
Multi-Disciplinary
We advance safety, applying rigorous processes that manage technical, environmental and social risks and hold ISO 45001:2018 – the internationally recognised standard for occupational health and safety management systems.
We provide engineering and design consultancy services across ten sectors: marine and coastal, geoscience, buildings, transportation, energy, environment, water, flooding, waste management, and conservation.
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Flooding Brochure / Sector: Flooding
Sector: Flooding Bringing Insight and Resilience
Technical Strength
Over one billion people now live in flood risk areas, as flooding becomes the most frequent and costly natural disaster affecting economies, businesses and communities worldwide. Climate change is accelerating this risk through more intense rainfall, rising sea levels and increased pressure on ageing drainage networks.
Ayesa Engineering has extensive experience working under NEC, PW-CF and FIDIC contracts, and supporting D&B and ECI delivery models, and are recognised as a global leader in water and transportation, ranked:
Ayesa Engineering helps clients understand flood risk, quantify its financial and operational implications and design sustainable solutions that protect people, assets and places. Our engineers play a vital role in safeguarding communities from flooding at coastlines, along rivers and waterways, and from surface water and groundwater within urban and rural drainage networks. Growth and Perspective Ayesa Engineering has tripled in size over the past three years, driven by strategic growth and the successful integration of specialist firms. This gives us both depth and agility: the reach of a global consultancy with the responsiveness of a focused expert partner. In flooding and water resilience, this matters. Climate risk does not respect borders. Our clients face common challenges across river basins, coastlines and cities worldwide. Ayesa Engineering brings global experience, local knowledge and engineering rigour to deliver flood solutions that are resilient, buildable and sustainable.
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14th in Water supply 24th in Transportation
(ENR Global Sourcebook 2025) Integrated Expertise Our scale allows us to bring together hydrology, civil engineering, environmental science, digital modelling, planning, cost consultancy and construction support within a single, integrated team. This means our clients benefit from: • • • •
Consistent technical standards across borders Rapid mobilisation of specialist expertise Multidisciplinary progression from strategy to delivery Resilient solutions designed for long-term performance
Our Approach Our approach is holistic. We engage with clients and communities to deliver solutions that not only reduce flood risk but also enhance biodiversity and improve the spaces in which we live. We work across transport, marine, energy, critical infrastructure and environmental sectors to provide integrated flood mitigation, relief and management solutions.
Sub-sectors
Catchment Area Planning and Hazard Mapping
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Flood Resilience Planning
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Flood Risk Assessment (FRA) and Management Plans (FRMP)
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Flood Relief Schemes
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Hydraulics, Hydrology and Hydromorphology
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Flooding Brochure / Flooding / Specialist Expertise
Working with Ayesa Engineering Where Ayesa Engineering Plugs Into Your Team Ayesa Engineering integrates flexibly into existing delivery models:
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As specialist sub-consultant to Tier 1 contractors on frameworks
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As technical partner to lead consultants
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As direct consultant to public authorities
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Flood management services across all scales:
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National
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Regional and local flood management in partnership with public authorities and councils, including the Office of Public Works in Ireland and other major infrastructure asset owners
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Private developments for homeowners and commercial developers
As modelling and flood risk centre of excellence for multidisciplinary teams
We add value where it matters most: at bid stage, at planning gateways, and on site.
From national flood programmes to urban resilience and critical infrastructure protection, Ayesa Engineering helps communities adapt, protect and thrive in a changing climate.
Services Across The Full Lifecycle Data Capture and Baseline Studies
Catchment and Hazard Assessment
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Aerial, LiDAR and DTM surveys
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Area and catchment planning
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Topographical and bathymetric survey management
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Catchment area modelling
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Hydraulic and hydrodynamic modelling
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Ground investigations and surveys
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River, coastal and surface water modelling
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Flood defence condition surveys
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Hydrological studies and flood estimation
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Historical flood and data analysis
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Flood extent and hazard mapping
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Ecological and environmental risk mapping
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Flood Risk Assessment and appraisal
Why Ayesa Engineering as Framework Partners As a specialist flood and water consultancy, Ayesa Engineering, enhances capability, improves bid quality, and supports efficient, low-risk delivery as a trusted technical partner - helping teams win work and deliver schemes that are technically robust, fundable, and buildable. Contractors and consultants partner with Ayesa Engineering because we: •
De-risk bids through proven delivery on nationally significant flood schemes such as Arklow (€57m) and Bandon (€30.5m)
Working With UK Frameworks And The Environment Agency In the UK, flood risk is managed through the national Flood and Coastal Erosion Risk Management (FCERM) framework led by the Environment Agency and devolved authorities, working with Lead Local Flood Authorities and Risk Management Authorities. Ayesa Engineering is positioned to operate within this landscape by: •
Supporting Environment Agency and Local Authority frameworks
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Strengthening Tier 1 contractor bids with specialist flood expertise
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Mobilise rapidly with in-house hydraulic modelling, hydrology and geomorphology teams
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Bring deep planning and EIAR expertise in sensitive and constrained environments
Aligning schemes with FCERM Strategy objectives and Outcome Measures
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Provide seamless continuity from feasibility through to construction supervision
Supporting Green Book-compliant business cases and funding submissions
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Design for buildability and temporary works interfaces
Embedding climate resilience and nature-based solutions
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Strengthen business cases through evidence-led optioneering and cost-benefit analysis
Accelerating optioneering, modelling and scheme development
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Reduce programme risk through early identification of environmental, hydraulic and constructability constraints
We understand the commercial and regulatory pressures within UK frameworks: pace of delivery, funding gateways, environmental compliance and buildability. Our role is to help partners move from concept to construction with confidence, clarity and technical rigour.
Strategy and Planning
Design and Delivery
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Flood risk management plans
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Design of flood defence systems
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Flood resilience planning
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Flood Relief Schemes
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FCERM Flood and Coastal Erosion Risk Management
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Pumping station assessment and development
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Contract administration
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Natural flood risk management measures
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Project Supervisor for Design Process (PSDP)
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Feasibility studies
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Principal Designer
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Environmental Impact and Appropriate Assessments
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Funding submissions
Engagement and Operations •
Stakeholder engagement and management
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Early flood warning systems
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Flooding Brochure / Flooding / Catchment Area Planning & Hazard Mapping
Catchment Area Planning & Hazard Mapping Catchment-Based Flood Management Catchment area planning recognises, assesses and manages flood risk at the river basin or catchment scale. It reflects a holistic approach that considers all sources of flooding and the interactions within a river basin to inform effective mitigation and risk management measures. At the European level, the EU Floods Directive (Directive 2007/60/EC) sets out a framework for Member States to undertake a Preliminary Flood Risk Assessment, develop detailed flood hazard and risk maps and prepare Flood Risk Management Plans. These plans must be updated in cycles and aligned with the objectives of the EU Water Framework Directive (Directive 2000/60/ EC), which provides an integrated framework for protecting the water environment. UK Landscape In the UK, flood risk is managed through a national framework led by the Environment Agency and devolved authorities, working alongside Lead Local Flood Authorities and other Risk Management Authorities. This is underpinned by a catchmentbased approach and the Flood and Coastal Erosion Risk Management (FCERM) Strategy for England, supported by Flood Risk Management Plans and Surface Water Management Plans across river basin districts. These programmes identify communities and assets at greatest risk, map fluvial, pluvial, coastal and groundwater flooding, and prioritise investment in both engineered defences and nature-based solutions. Ayesa Engineering is Your Specialist Partner for Flood Resilience within UK Frameworks Ayesa Engineering is positioned to support this landscape by working alongside the consultants, contractors and delivery partners operating within these frameworks. We provide specialist flood risk, hydraulic modelling and resilience expertise to framework teams, strengthening bids, shaping solutions and de-risking delivery. Our role is to complement and enhance existing capabilities, supporting lead consultants and contractors with robust technical input, innovative design and evidence-led decision making. This allows our partners to deliver compliant, fundable and climateresilient schemes at pace, while embedding flood resilience into both new development and existing communities.
Ireland Landscape In Ireland, catchment-based flood risk assessment and management has been delivered through the National Catchment Flood Risk Assessment and Management (CFRAM) Programme, led by the Office of Public Works in collaboration with local authorities and other stakeholders. The CFRAM Programme identified approximately 300 areas across the country at potentially significant flood risk and produced detailed flood maps and Flood Risk Management Plans to support evidence-based decision making on mitigation measures. Supporting the Office of Public Works and Local County Councils Ayesa Engineering works within this national framework alongside the OPW and County Councils to support the planning, design and delivery of flood relief schemes. We act as a trusted technical partner to public bodies and their delivery teams, providing specialist flood risk assessment, hydraulic modelling and scheme design expertise. Our role is to strengthen programme delivery at local level, helping authorities progress CFRAM actions into buildable, fundable and resilient flood schemes that protect communities, critical infrastructure and economic activity. Catchment planning uses a wide range of evidence to inform detailed schemes and strategies, including: • • • •
Historical flood records and event analysis Long-term rainfall and hydrological data High-resolution floodplain and channel surveys Predictive hydraulic and hydrodynamic modelling for riverine, coastal, groundwater and pluvial sources
Our hydraulic and catchment models identify potential flood hazards and quantify associated risks to people, infrastructure, the economy and the environment. These models inform the selection and design of appropriate mitigation measures, from broad catchment-scale interventions to targeted local flood relief schemes where required. Our approach aligns with national policy and natural ecosystem functions, integrating detailed surveys and walkovers to identify opportunities and co-benefits, stakeholder engagement, rigorous modelling and options assessment, and the use of natural water retention measures where feasible to support multiple environmental objectives. This evidence-based methodology ensures that flood risk management solutions are resilient, sustainable and tailored to local and catchment-wide needs.
Related Projects • • • •
Arklow Flood Relief Scheme Bandon Flood Relief Scheme Borrisokane surface water drainage improvements Clontarf Flood Relief Scheme
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Ennis Flood Relief Scheme Glen / Passage West Flood Defence Scheme Howth Flood Relief Scheme River Dargle Flood Relief Scheme River Fergus Ennis Flood Scheme
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Flooding Brochure / Flooding / Flood Resilience Planning
Flood Resilience Planning Planning for Urban and Rural Resilience Flood resilience is no longer optional. Local authorities, councils, municipalities and businesses must plan for increasing flood risk, where practical interventions can materially reduce exposure and long-term damage. Flood resilience planning is often linked to flood forecasting and warning systems. However, the greatest value is achieved when resilience is embedded into the fabric of places through flood resilient design. We help clients move from reactive protection to proactive, integrated resilience. We support local authorities and asset owners in delivering physical flood management solutions including engineered defences, river training, nature-based interventions and coastal protection. Our approach integrates water-sensitive design into the built environment, protecting communities, enabling regeneration and safeguarding ecosystems. We have delivered flood resilience solutions for highly vulnerable receptors such as hospitals and nursing homes, enabling them to achieve levels of protection aligned with their corporate risk tolerance and duty of care.
Our Flood Resilience Services Local Authorities and Government •
Design and delivery of resilient flood alleviation and defence schemes including engineered defences, river training, wetlands, catchment planning and coastal protection Development of flood forecasting and warning systems Emergency and response planning Nature-based solutions for water attenuation Implementation of Sustainable Urban Drainage Systems (SuDS) Cross-boundary collaboration between counties and authorities
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Businesses and Individual Properties •
Asset flood survey mapping for risk and resilience, pre and post event Risk assessment across fluvial, pluvial, coastal and groundwater flooding, including climate change impacts Development of property-level resilience measures including demountable barriers, nonreturn valves and flood-compatible design
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Related Projects • •
Bon Secours Hospital Blarney Housing Development
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Flooding Brochure / Flooding / FRA & FRMP
Flood Risk Assessment (FRA) and Flood Risk Management Plans (FRMP) Assessing and Managing Flooding Risks The purpose of a Flood Risk Assessment (FRA) is to identify and quantify the risk of flooding to people, property and infrastructure. Following the flood risk assessment, if the identified risk is unacceptable, we prepare a Flood Risk Management Plan (FRMP) that outlines cost-effective and sustainable long-term management strategies. FRAs can be undertaken at regional, strategic or sitespecific scales. The assessment of the flood risk follows a specific sequence of steps: • • • •
Calculate the extent and frequency of flooding Determine the economic, social and environmental impact of flooding, including the safety and health impacts Outline the existing risk and potential future risk resulting from changes in climate and human activity Flood Maps are used to indicate flood extents, depths and hazards for a range of probabilities (return periods). Determination of economic damages are typically calculated from databases of historical costs of flooding
The assessment of the flood risk follows a specific sequence of steps: • • • • • • • • •
Adaptation planning Emergency response planning Flood forecasting and warning Individual property protection Land use management Maintenance of river channels Natural water retention measures Promotion of individual and community resilience Structural measures such as flood defence walls and embankments Sustainable planning and development management Sustainable Urban Drainage Systems (SUDS) Voluntary Home Relocation
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Certain options will address the existing flood risk, e.g., structural measures, whereas others are suitable for managing future flood risk only, e.g. sustainable planning and development. All feasible options are considered in detail through a multi-criteria analysis that considers the technical, environmental, and eco nomic aspects of each, allowing a preferred option to be chosen from the results.
Related Projects • • • • • • •
Ballyvolane Flood Risk Assessment & Plan Bon Secours Flood Risk Assessment & Management Plan Howth Flood Relief Scheme Cuil Didin Nursing Home Flood Risk Assessment Stoke by Nayland FRA HS2 Shadow Brook Diversions FRA Mortimer Brook FRA
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Flooding Brochure / Flooding / Flood Relief Schemes (FRS)
Flood Relief Schemes (FRS) Helping alleviate flooding at regional and national levels When developing and delivering a flood relief scheme, our team of engineering and environmental experts provide consulting services and advice across all stages of the scheme lifecycle. We collaborate across our broad pool of experts to conduct surveys/investigations and analysis (hazard mapping, hydrological and geomorphological studies), as well as Drainage Assessments, Rainwater Management Plans and Sustainable Drainage Systems (SuDS) to fully understand flooding and its impacts on the environment, on landform, on ecology and on society and explore impacts, resilience and trends. Sustainable FRS solutions require a detailed understanding of flood risk management through consideration of both structural and non-structural flood alleviation measures. All potential options require a rigorous assessment of their technical and environmental aspects including cost-benefit analysis and suitability for adaption to climate change. We consider the entire scheme lifecycle to ensure that the operational and maintenance requirements are given adequate attention. Project, Location, Country
At Ayesa Engineering, our team has decades of experience in developing and assessing flood relief measures that are both robust and sustainable. We incorporate Nature Based Solutions into flood risk management where appropriate. Using catchmentscale mapping, we identify opportunities for measures such as floodplain reconnection, wetland restoration and natural storage to reduce flood risk while enhancing biodiversity and climate resilience. These options are assessed alongside traditional engineering approaches to deliver sustainable and adaptable flood relief schemes.
Stakeholder Engagement and Planning Public and stakeholder consultation is a key component for the successful delivery of a flood relief scheme. This includes liaisons with statutory bodies and citizens either directly affected by flooding or impacted by the proposed solutions for flood alleviation. Most flood relief schemes will require planning permission either from the Local Authority or An Bord Pleanála through the Planning and Development Regulations and/or the Arterial Drainage Acts. The planning process has become significantly more challenging in recent years and Ayesa Engineering has met this challenge through attention to detail to ensure proposals are compatible with the relevant legislation. Our flood relief schemes strive to combine resilient engineering with minimal environmental impacts and numerous community benefits. Buildability is another key consideration that Ayesa Engineering addresses at all stages of the scheme development ensuring flood relief measures can be delivered with minimal risks to successful completion.
Our consultants offer expertise spanning all phases: • • • • •
Feasibility/preliminary design Contract procurement and project management Environmental assessment & planning Detailed design of Flood Relief Scheme (FRS) Stakeholder communications, engagement and consultation Construction supervision and handover Construction Quality Assurance (CQA) and works verification
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Related Projects • • • • • • •
Arklow Flood Defence Scheme Bandon Flood Relief Scheme Tipperary Flood Relief Schemes Borrisokane Flood Surface Water Drainage Cavan Flood Defence Scheme Clontarf Flood Relief Scheme Ennis Flood Relief Scheme
Project, Location, Country
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Graiguenamanagh-Tinnahinch FRS Glen Passage West Flood Defence Scheme Holycross Flood Relief Scheme Howth Flood Relief Scheme Knocklofty Flood Relief Scheme River Dargle Flood Relief Scheme River Dodder Flood Alleviation Scheme (P3).
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Flooding Brochure / Flooding / Hydraulics, Hydrology and Hydromorphology
Hydraulics, Hydrology and Hydromorphology Understanding Flood Behaviours, Risks and Consequences There are many areas, including towns and cities, that are already at risk from periodic flooding. The effects of climate change, such as more severe rainfall events and rising sea levels, will exacerbate risks and put areas at risk that may not have flooded in the past. Thus, it has become vital to study flood behaviours, risks, and consequences. Our team uses hydrologic/ hydraulic modelling to investigate the relationship between rainfall, runoff, and flooding. When appraising flood potential and the risks within particular areas (e.g. flood plains), we often apply hydraulic and hydrologic data modelling to examine meteorological and river flow data. Hydraulic modelling analyses the performance and design of infrastructure such as bridges, stormwater infrastructure and wastewater systems during a potential flood event. Commonly, a hydraulic analysis uses computer modelling software to represent the surrounding ecosystems – the terrain, structure, river and water flow. Through our studies, clients can understand flood risk and develop robust flood mitigation measures. We apply computational flood modelling to support spatial planning, risk assessment, management and the development of flood risk management (FRM) schemes. We also use Hydraulic modelling in 1D, 2D and linked 1D-2D to better understand coastal, pluvial, fluvial, drainage networks. We use hydromorphology (or fluvial geomorphology) to investigate potential impacts of watercourses on landform over time. These can include possible erosion/scour, sediment transport and deposition. As man-made construction can affect the hydromorphological watercourse regime - assessing any potential impacts on the proposed scheme or development is crucial for success. We use fluvial geomorphology to inform and guide a variety of projects: • • • • •
Construction River restoration Sediment transport Hydraulic modelling Natural Flood Management (NFM)
Hydromorphology can play a role in appraising Natural Flood Management (NFM). Nature-based solutions for flooding can be as simple as restoring a river to a meandering path, widening or deepening a river, adding wetlands, woodlands and heaths or introducing soft engineering works (woody debris dams). Our in-depth knowledge of river hydromorphology and geomorphological dynamics assists clients in risk assessments, informs the environmental impact process, helps alleviate flooding impacts, and informs instream flow requirements, system restoration, and ecology. Ayesa Engineering provides flood risk services to public and private sector clients in the public and private sectors. We work with local authorities such as the OPW in Ireland to deliver key flood relief schemes. Our projects range from large flood relief schemes or one-off site assessments for developers. Services • • • • •
Geomorphology Assessment Ground Investigations and Surveys (GIS Hydrogeological Assessment Hydrodynamic modelling & assessment Hydraulic modelling in 1D, 2D and linked 1D-2D for coastal, pluvial, fluvial, drainage network Hydrological studies Hydromorphology assessment Natural flood risk management measures River modelling Surface water modelling Sediment transport
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Related Projects • • • • •
Bon Secours Flood Assessment and Planning Carrigtwohill Flood Relief Scheme Cuil Didin Nursing Home Flood Risk Assessment Tipperary Bundles Flood Relief River Fergus Ennis Flood Scheme
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Flooding Brochure / Flooding / Projects
Projects
Arklow Flood Relief Scheme
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Bons Secours Flood Risk Assessment & Management Plan
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Carrigtwohill Flood Relief Scheme
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Howth Flood Relief Scheme
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River Fergus Ennis - Flood scheme
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Bandon Flood Relief Scheme
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River Dargle Flood Defence Scheme
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Tipperary Bundles Flood Relief Schemes
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Graiguenamanagh - Tinnahinch Flood Relief Scheme
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Cuil Didin Nursing Home Flood Risk Assessment
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Stoke by Nayland FRA
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Ballyvolane Flood Risk Assessment & Management Plan
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HS2 Shadow Brook Diversions FRA
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Mortimer Brook FRA
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Other Projects include: • • • • • • • • •
Ramelton FRS Buncrana FRS Cavan FDS River Dodder FRS Knocklofty FRS Kenmare FRS Springfield FRS Ballina FRS Ballybofey-Stranolar FRS
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Borrisokane Flood Surface Water Drainage Clontarf FRS Graiguenamanagh-Tinnahinch FRS Glen Passage West FDS Holycross FRS Howth FRS Knocklofty FRS River Dodder Flood Alleviation Scheme (Phase 3). Glen / Passage West FDS
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Flooding Brochure / Flooding / Projects Project Focus
Arklow Flood Relief Scheme
Overview Located in County Wicklow, Ireland, the Arklow Flood Relief Scheme has been developed to address the town’s long-standing and severe flood risk. Arklow, home to approximately 14,000 people, has experienced repeated and damaging flood events over several decades, with major incidents recorded in August 1986, December 1989, November 2000, February 2002, October 2004, October 2005, January 2010, January 2013, December 2015 and January 2026. These events have caused extensive damage to homes, businesses, and public infrastructure, disrupting daily life and placing a sustained economic and social burden on the community. The frequency and severity of flooding in Arklow clearly demonstrate the vulnerability of the town and the urgent need for a robust, long-term flood defence solution. Our Role Ayesa Engineering was initially appointed by OPW to complete the feasibility assessment and to develop the scheme. Ayesa Engineering completed all hydrological and hydraulics modelling, including development of flood mapping for national risk identification. Ayesa Engineering undertook a detailed multi-criteria analysis to arrive at a preferred option, including a cost:benefit analysis in accordance with the Flood and Coastal Erosion Risk Management A Manual for Economic Appraisal (Multicoloured Manual). Once a preferred scheme was identified and agreed with the Client, Ayesa Engineering developed the scheme for planning, including all preliminary design and drawings and relevant chapters of the EIAR. Our remit extended to managing critical site investigations and surveys across the Scheme Area. Key achievements during this phase include the environmental constraints study, the assessment of design options, the development and public consultation of the preferred scheme, and the finalisation of the scheme design and environmental assessment.
Location:
Arklow
Country:
Ireland
Capital Value:
€57m
Client:
Wicklow County Council in partnership with the
OPW (Office of Public Works)
During the planning stage, Ayesa Engineering led the Avoca River (Arklow) Flood Relief Feasibility Study, a rigorous technical programme to determine appropriate design return periods for river flows and tidal levels. This involved the use of both gauged and ungauged flood estimation methods, together with advanced hydraulic modelling tools including HECRAS and TeleMac2D. The outputs comprised detailed flood mapping showing predicted extents, depths and hazard levels, providing critical evidence to underpin the mitigation strategy. Working collaboratively with other consultants, Ayesa Engineering optimised resources and reduced overall costs, while engaging closely with key stakeholders including Irish Water, the National Parks and Wildlife Service, the Department of Housing, Local Government and Heritage, and Inland Fisheries Ireland. The Public Realm design integrates flood defence walls seamlessly into the urban and riverine landscape, enhancing both functionality and amenity. The scheme incorporates a range of ecological enhancements, including riverbank extensions, native species planting, roosting platforms for birds, and bat tubes within bridge arches and flood walls. A significant innovation has been Ayesa Engineering’s coordination of parallel consultant teams working across planned locations to achieve economies of scale. Our geomorphological studies also supported the retention of a strategic “pinch point” within the Flood Relief Scheme, preserving the existing quay wall. This approach enables the extension of the riverside promenade and green spaces, delivering tangible community benefits while strengthening Arklow’s long-term resilience to flooding. Following the successful planning approval granted by An Bord Pleanála in July 2022, Ayesa Engineering was reappointed to advancing the scheme into its next phase, supported by a €57 million investment from Wicklow County Council and the OPW. Ayesa Engineering has thus far provide advice on strategy for design, and procurement and completed the detail design, work specifications and pricing documents for an Employer Design PWC contract.
Key Project Highlights: Ayesa proposed and designed an approach to underpinning the historic Arklow Bridge, a mid 18th century 19-span stone masonry protected structure. The bridge sits on estuarine gravels and the challenge was to devise an efficient means of reducing the bed of the river though the reach to improve flow capacity of the channel.
The design entails grouting of the piers and substrate, a Dywidag micropile foundations tied with a Cintec anchor across each pier and a liner wall. This approach standardised the construction methods, therefore reducing the construction programme, minimised risk of settlement of the bridge and mitigated cultural heritage impacts compared to traditional underpinning.
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Flooding Brochure / Flooding / Projects Project Focus
Bons Secours Flood Risk Assessment & Management Plan
Location:
Overview
Our Role
Bon Secours Health System Cork is Ireland’s largest private hospital, and it is also one of the largest private hospitals in Europe. The hospital was established in 1915 and has more than 300 beds. It employs more than 1,000 staff and admits about 35,000 patients every year. It is a general hospital providing an extensive range of medical and surgical specialities for adults and children.
Ayesa Engineering was retained by Bon Secours Health Systems to review the proposed development in the context of flood risk from the River Lee South Channel to the development itself and the risk to other properties as a result of the development, to assess and quantify the flood risk, to develop measures to manage and mitigate the flood risk and to apply the Justification Test in accordance with the “The Planning System and Flood Risk Management – November 2009”.
A planning application was submitted to Cork City Council on behalf of Bon Secours Health Systems for an extension to the Bon Secours Hospital at College Road, Cork, part of a €77million expansion of the hospital. The proposed development included a seven-storey extension to the north of the existing hospital with bridge link connections at a high level between the existing hospital and the proposed extension. It also included a replacement of the existing single-lane vehicle bridge over the South channel of the River Lee with a two-lane vehicle bridge. A decision to grant planning was issued by Cork City Council in July 2014. This decision was appealed to An Bord Pleanála (ABP) by a third party who cited flood risk as the appeal ground, calling for the decision to be overturned.
Cork
Country:
Ireland
Capital Value:
€77m
Client:
Bon Secours Health Systems
Our team worked with the project team including the Client, Planners, Architects and Structural Engineers to ensure that the Development could be delivered with planning permission and also satisfy the requirements of the hospital to deliver a first class health service. A Flood Risk Assessment & Management Plan together with a Justification Test was prepared by Ayesa Engineering for submission to ABP in response to the third-party appeal. Innovation / Value Add The project was challenging as the hospital extension would be located in flood zone A of the River Lee South Channel. As such, modifications to the development were put forward to manage any impact on flood storage and ensure that the facility would remain functional during a flood event. The Development was subsequently granted planning with ABP upholding the Council’s decision and the new extension was formally opened in 2019.
28
Flooding Brochure / Flooding / Projects Project Focus
Carrigtwohill Flood Relief Scheme
Overview Carrigtwohill Flood Mitigation Measures (FMM) was a €4.2 million project in County Cork, Ireland, undertaken to reduce flood risk on lands owned and operated by the Industrial Development Agency (IDA), Ireland’s national foreign direct investment agency. The IDA’s Carrigtwohill landholding extended to approximately 54 hectares and was zoned for high quality industrial development of regional or national economic importance. The scheme commenced in early 2018, with preparatory flood risk assessment work having been commissioned earlier in the decade, and the mitigation works were completed in Autumn 2019. The project involved infrastructure to manage and control surface water flood risk across the site and helped stabilise watercourses, provide scour protection and debris control, and reduce the potential for flooding impacting future industrial development.
Our Role IDA (Irish Development Authority) Ireland appointed Ayesa Engineering to the role of consulting engineer to manage all professional services, including hydrological studies and assessments, hydraulic modelling, assessment of flood risk management options and planning applications. Ayesa Engineering undertook the complete preliminary and detailed design of the scheme, which included a 15,000m3+ attenuation crate system, linked to an 30,000m3 open pond to storage flood waters. The scheme also includes surface water drainage system, flood embankments and flow control structures. Ayesa Engineering acted as Employer’s Representaitve for the duration of the construction, administering the contract and until completion.
Location:
London
Country: Location: Capital Value: Country: Client: Capital Value:
UK Carrigtohill Undisclosed Ireland PCC of St George’s, Hanover Square €4.2m
Client:
IDA Ireland
30
Flooding Brochure / Flooding / Projects Project Focus
Howth Flood Relief Scheme
Location:
Howth, Dublin
Country:
Ireland
Capital Value:
Undisclosed
Client:
Fingal County Council
Overview
Our Solution
Ayesa Engineering was appointed to prepare a preliminary report to assess flood risk across the steep and hilly Howth Peninsula arising from the foul water network, storm drainage systems and the small numerous watercourses that drain the area. The objective was to identify viable, sustainable solutions to mitigate flood risk across the peninsula. The commission covered the entire peninsula, with the exception of the Offington area, which had already been assessed under a separate scheme.
Our solution delivered a clear cost benefit while ensuring there was no significant risk to the environmentally sensitive sites in the vicinity of Howth. The agreed measures focused on targeted, buildable interventions to reduce flood risk across the area:
Working closely with the local authority and community, Ayesa Engineering met with residents and received formal submissions to inform the study. Our team undertook a comprehensive programme of CCTV, manhole, flow, rainfall and topographic surveys, and developed a robust hydraulic model of the catchment. Through detailed hydraulic analysis, we identified the areas most vulnerable to pluvial (stormwater) flooding and established the underlying mechanisms driving risk. The hydrological review confirmed that historic flood events occur when intense rainfall falls over a short duration, overwhelming the local drainage network. In total, approximately 44 properties were identified as being at risk of flooding. This evidence-based approach provided a clear foundation for developing targeted, sustainable flood mitigation measures for Howth.
1.
Construction of 258 m of new storm drainage to remove stormwater flows from combined sewers together with the upgrade of 124 m of existing storm sewer.
2.
Construction of 350 m of new storm drainage, 750 mm in diameter.
3.
Construction of a cross-connection between an existing siphon and overflow from a pumping station to alleviate flooding the main arterial road into Howth Village.
4.
Implementation of short-term, cost-effective measures, including installation of non-return valves at low-lying outfalls and on domestic foul water connections known to flood..
5.
Local kerb raising at Kilrock Road to direct overland flows away from vulnerable properties.
6.
Assessment of an existing stone culvert along Main Street, which had been observed to be in poor structural condition with at least two known collapses in recent years.
7.
Full CCTV survey of areas with a known flood history to identify and rule out structural or maintenance-related issues within the drainage network.
Together, these measures formed a coordinated, practical response to surface water and sewer flooding, delivering tangible risk reduction while remaining sensitive to the local environment and community.
32
Flooding Brochure / Flooding / Projects Project Focus
River Fergus Ennis Flood Relief Scheme
Location:
London
Country: Location: Capital Value: Country: Client: Capital Value:
UK County Clare Undisclosed Ireland PCC of St George’s, Hanover Square Undisclosed
Client:
Office of Public Works
Overview Due to major flood events affecting County Clare’s county town over many centuries, the development and implementation of a comprehensive flood relief scheme in the county town, Ennis, became essential. The programme was delivered in two phases: the River Fergus (Ennis) Certified Drainage Scheme and the River Fergus Lower (Ennis) Certified Drainage Scheme. Together, these schemes formed an integrated approach to managing flood risk in Ennis, addressing both fluvial and tidal influences on the River Fergus and providing long-term protection for the town, its communities and critical infrastructure. Our Role Scope of work included: • • • • • • • • • • •
Preliminary Report Preparation Outline Design Preparation of Public Exhibition Documents including Interference Notices Cost Benefit Analysis Hydraulic Modelling of River, Estuary and Surface Water Collection System Procurement of Geotechnical Site Investigation and Utility Surveys Detailed Design and Contract Documents Preparation of Tender Documents Tender Assessment and Recommendation Construction Administration Handover
Ayesa Engineering also prepared the Environmental Impact Statement for the schemes and managed third-party specialist ecologists in the development of environmental mitigation measures, working in close consultation with the National Parks and Wildlife Service and the Shannon Regional Fisheries Board. The schemes were delivered by a project team comprising Ayesa Engineering, JB Barry (now Egis) and NUI Galway.
Ennis Town Centre during flooding in 2009
35
Flooding Brochure / Flooding / Projects Project Focus
Bandon Flood Relief Scheme
Overview Bandon, is one of the largest towns in West Cork with origins dating back to the early 17th Century. Much of the work undertaken on this flood relief scheme includes both Recorded Monuments and National Monuments. For many years the town and surrounding area have suffered significant flood events that caused damage to properties and losses to businesses. The flooding is primarily due to high flows in the Bandon River and its tributary, the Bridewell River, which exceed the channel capacities. In February 2011, the Office of Public Works, in partnership with Cork County Council, commenced initial feasibility and investigations. This was one of the first schemes to be designed using a pilot Catchment Flood Risk Assessment and Management Studies (CFRAM Study). The CFRAM Study policy was a shift to catchment-based, flood risk-management measures. In 2011, the OPW appointed Ayesa Engineering as the lead consultant to the scheme. Our scope included the hydrological studies and assessments, hydraulic modelling of flood flows in the Bandon River and its tributaries, examination of flood risk management options, and selection of preferred options based on environmental, social, technical, and economic criteria. Our Role Stage I: Feasibility Study and Preparation of a Flood Risk-Management Plan; Stage II: Public Exhibition; Stage III: Detailed Design, Confirmation and Tender; Stage IV: Construction; Stage V: Handover of Works. We prepared the final plan and the Flood Risk Management Plan and public exhibition documents to receive statutory approval and ministerial signoff on the scheme. In addition, our team carried out the geotechnical and structural design for the flood defences. This included: the design and specification of reinforced concrete flood defence walls, the design of piled foundation, piers, and deck for a new pedestrian footbridge, design and specification of flood defence embankments.
Location:
Cork
Country:
Ireland
Capital Value:
€30.5m
Client:
Office of Public Works (OPW),
Cork County Council
To increase the flow capacity of the river, it was necessary to dredge over 3.6km of the river floor and banks. This dredging of the river bed was extensive - approximately 1.8m below the existing bed level in the town and at a grade of 1/1000 until it reached the existing bed level 3.6 kilometres downstream from the town. Approximately 150,000m3 of material was dredged. The project team enforced the Construction Environmental Management Plan (CEMP) which included sediment management and solids monitoring plans. Ayesa Engineering also designed significant instream fishery rehabilitation works, using specialist in the field and in coordination with Inland Fisheries Ireland. This was the 1st time such would have been design and included in a capital works contract, rather than be done ad-hoc. Works were carried out throughout the town of Bandon, and extensive traffic management and Environmental Mitigation works were required throughout the scheme phases. New flood defences were constructed to contain flood water within the Bandon and Bridewell River and the Mill Stream. The scheme also included the construction of new defence walls and embankments along the Bandon River, the underpinning/mini pilling of Bandon Bridge which required extensive archaeological works and temporary protection and the construction of a rock ramp for fish passage. Additionally, rip-rap revetment details were designed for the dredged profiles of the river. The old steel footbridge was replaced with a new three-span steel footbridge to increase capacity and safety. Further works included the construction of new RC culverts, local drainage works in and about the town of Bandon together with extensive brick paving and landscaping. Innovation / Value Add The client tasked Ayesa Engineering with delivering a scheme that was as passive as possible, with minimal reliance on human intervention. Through intelligent design and detailed planning, the solution is almost entirely passive, operating automatically under flood conditions.Rather than relying on demountable defences or manual deployment during extreme events, the scheme uses fixed walls, embankments and increased river capacity as its primary protection measures.
36
Flooding Brochure / Flooding / Projects Project Focus
River Dargle Flood Defence Scheme
Overview The River Dargle rises in the Wicklow Mountains, falls over Powerscourt Waterfall, and enters the Irish Sea at Bray Harbour. As the river has historically been a repeated cause of flooding in Bray and the surrounding lowlands, the River Dargle Flood Defence Scheme was implemented to protect hundreds of properties in County Wicklow from future flood damage. The €46m scheme was officially opened in October 2017. Our Role Ayesa Engineering was appointed by Wicklow County Council, on behalf of the Office of Public Works (OPW) to provide detailed design and tender documentation for this scheme. In seeking to provide the best value, and in order to integrate with the existing infrastructure, a range of construction options were chosen. These included earth embankments, piled walls, concrete walls and scour protected slopes. We also designed a solution for underpinning and deepening the channel at Bray Bridge as part of a previous phase of this project.
Location:
London
Country: Location: Capital Value: Country: Client: Capital Value:
UK Wicklow Undisclosed Ireland PCC of St George’s, Hanover Square €46m
Client:
Wicklow County Council
38
Flooding Brochure / Flooding / Projects Project Focus
Tipperary Bundles Flood Relief Schemes
Overview
Location:
Tipperary
The towns of Ballina, Holycross and Knocklofty have been identified as locations prone to significant flood risks in a national assessment in Ireland. Ayesa Engineering has been appointed to complete the preliminary design, planning, detailed design, construction supervision and handover to provide flood relief protection to each of the towns. The works will include flood defence embankments, flood gates, floodwalls, river channel capacity improvements, local drainage improvements and upgrade(s) to culverts.
Country:
Ireland
Capital Value:
Undisclosed
Client:
Tipperary County Council
Our Role Appointed for the entire project lifecycle, from inception to completion, initial works carried out by Ayesa Engineering includes the preliminary design, which will include completing hydrological and hydraulic (river modelling) assessments, identifying the preferred schemes and then completing the necessary environmental and planning assessments in order to obtain statutory approval for the schemes.
40
Flooding Brochure / Flooding / Projects Project Focus
Graiguenamanagh Tinnahinch Flood Relief Scheme Overview The Graiguenamanagh–Tinnahinch Flood Relief Scheme is a cross-county project protecting the twin towns of Graiguenamanagh (Co. Kilkenny) and Tinnahinch (Co. Carlow) from River Barrow flooding. The towns have a history of inundation due to the river’s wide floodplain, constrained urban sections, and backwater effects from a navigation weir all of which contribute to the flooding of homes, businesses and key routes. The final scheme includes flood walls, embankments, glass sliding gates, pumping stations and drainage improvements and a large upstream storage areas controlled by a hydrobrake to reduce flows downstream on a flashy tributary. Our Role Funded by the Office of Public Works (OPW), with Kilkenny County Council acting as Client, Ayesa Engineering were appointed to complete the preliminary design and obtain planning permission for the scheme. Ayesa Engineering undertook both the engineering and environmental development of the project. This included preparation of an Environmental Constraints Report, Environmental Impact Assessment (EIA), and all ecological surveying (mammals, birds, aquatic ecology, reptiles, invertebrates), as well as the Natura Impact Statement (NIS), stakeholder engagement, and environmental optioneering. Ayesa Engineering also carried out the full engineering development of the scheme, including hydrology, hydraulics and optioneering, and provided a cost: benefit assessment in accordance with the MCM manual to justify the scheme. Outcomes •
Significant reduction in flood risk to residential and commercial properties.
•
Enhanced resilience of cross-river connectivity and local infrastructure.
•
Sensitive integration of flood defences within a historic riverside environment.
•
Long-term protection for both communities.
Location:
London
Country: Location: Capital Value: Country: Client: Capital Value:
UK County Kilkenny Undisclosed Ireland PCC of St George’s, Hanover Square €22m
Client:
Kilkenny County Council
42
Flooding Brochure / Flooding / Projects Project Focus
Flood Risk Assessment Projects
Cuil Didin Nursing Home Flood Risk Assessment Cuil Didin Residential and Nursing care home is situated near Tralee in Co. Kerry. Following the publication of the draft CFRAM study flood mapping for consultation, part of the nursing home was shown indicatively to be at risk of flooding from the 1% AEP fluvial flood event. Ayesa Engineering were retained to perform a desk based Flood Risk Assessment to estimate the flood risk to the nursing home following the ‘The Planning Systems and Flood Risk Management - Guidelines for Planning Authorities’. Stoke by Nayland FRA Ayesa Engineering was appointed by Stoke by Nayland Resort to deliver a comprehensive Flood Risk and Environmental Assessment to support reservoir de-silting works designed to restore capacity and enhance flood resilience. The project includes securing a Flood Risk Activity Permit, undertaking a Water Framework Directive Compliance Assessment to protect water quality, preparing a robust management plan for safe delivery, and completing a Preliminary Ecological Appraisal to ensure environmental protection and regulatory compliance. The scheme demonstrates a sustainable approach, reusing recovered silt within the golf course expansion while safeguarding surrounding waterbodies and habitats.
Ballyvolane Flood Risk Assessment & Management Plan A new mixed-use retail complex, comprising an anchor store, retail service units, financial services and restaurants, was proposed for a site adjacent to the Glen River in Ballyvolane, in the northern environs of Cork City. Ayesa Engineering was appointed to assess whether any flood risk issues arose from the proposed development and to identify, where necessary, appropriate measures for the management and mitigation of potential impacts. Our team undertook detailed hydrological calculations and hydraulic modelling to assess both existing and proposed scenarios. Where required, the proposed development was modified and remodelled to ensure that impacts were negligible or that suitable mitigation was provided. Ayesa Engineering also prepared the response to the Justification Test under the Planning Guidelines on Flood Risk Management, demonstrating that each of the required criteria was satisfied. The assessment concluded that the proposed development would have a negligible impact on the existing flow and flooding regime within the Glen River catchment and would, in fact, reduce flood risk. Ayesa Engineering provided the following services: • Hydrological analysis, including allowances for climate change and confidence levels • Hydraulic modelling of the river channel and culvert • Assessment of the impacts of the proposed development • Recommendations on mitigation measures where required • Preparation of the Flood Risk Assessment Report, including the Justification Test
HS2 Shadow Brook Diversions FRA
Mortimer Brook FRA
Ayesa Engineering was appointed by Balfour Beatty VINCI Joint Venture (BBV) to provide a Flood Risk Assessment (FRA) in support of the temporary diversion works being proposed and in support of a Schedule 33 Part 5 application on the Shadow Brooks watercourse. The temporary diversion works consist of two temporary division channels on the Shadow Brook Watercourse required for the installation of two proposed culverts which are facilitating the realignment of Diddington Lane as part of HS2, on the outskirts of Birmingham.
Ayesa Engineering was appointed by Southern Renewal Enterprise to prepare a Flood Risk Assessment for proposed remedial works along the Mortimer Brook Embankment, near The Street Road, Reading, UK. The works form part of Network Rail Remit and aim to prevent further ballast shoulder drop and troughing, reduce exposure of sleeper ends, and halt ongoing soil creep and earthflow along the slope. The assessment ensures the works can be carried out safely while managing flood risk and protecting the embankment’s long-term stability and reliability.
The FRA assessed the baseline flood risk and the post-scheme flood risk as a result of the construction of the two temporary diversion channels. The temporary diversion channels were designed to provide the same capacity as the existing Shadow Brook channel through the diverted area. Bunding/ embankments were also included in the temporary works design to mitigate flood risk to the dewatered area. A construction sequence for the temporary channel diversion was also provided along with a Design Risk Assessment (DRA).
Stoke by Nayland FRA
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