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Potoky pro život ‒ Streams for Life

PROJECTS COMPLETED FROM 2005 TO 2015

10 years of revitalization projects in Prague


MOTTO: „WE RETURN LIFE AND NATURAL BEAUTY TO STREAMS.“

Apart from the rivers of Vltava and Berounka, another 357 kilometres of smaller watercourses flow through Prague, of which 308 km are managed by the City of Prague, 18 km by Povodí Vltavy, state enterprise, 25 km by Povodí Labe, state enterprise, and 6 km by Lesy ČR, state enterprise. The most significant Prague brooks include Rokytka, which is the longest stream in the city (with the total length of 37.5 km of which 30.3 km is located in the territory of Prague). The largest stream in Prague is the Botič Stream,with the total length of 34.5 km. Other major brooks include the Litovický and Šárecký Stream (23.4 km), or the Dalejský (14.3 km) and the Kunratický Stream (13.3 km). The hardly noticeable small brook of Brusnice is probably the most notable from a historical point of view, as its name appears in the oldest legends on the foundation of Prague.

OBJECTIVES OF THE “STREAMS FOR LIFE PROJECT” 1. E N V I R O N M E N TA L Modification of watercourses in a manner that would provide a basic habitat for water fauna and flora, as well as creation of natural and close-to-nature alluvial and stream biotopes. During the revitalization and reconstruction process, particular emphasis is placed on replenishing riparian stands, creating littoral and riparian vegetation belts, as well as constructing small eyots, pools, and cutoff meanders. Increasing the number of plant and animal species bound with water ecosystems – enhancement of biodiversity on the territory of the capital city of Prague, preservation of protected species in the Prague watercourses. During the revitalization process, attention is given to the occurrence of protected species in streams. Concurrently, efforts are aimed at creating a „tailor-made“ environment for these species that would boost their occurrence in the capital city of Prague. Supporting the exploitation of the self-cleaning functions of watercourses and alluviums. Water oxygenation is improved by constructing ramps and chutes, vegetation elements are used for bank lining, littoral zones are complemented. Regular monitoring and improvement of water quality. Systematic research is carried out and non-permitted wastewater outlets into watercourses are removed. Clearing of watercourses in order to secure the penetrability of migrating water organisms. Cascades and other obstacles are removed or replaced with stone slides. Lengthening of watercourses. The revitalization of streams is aimed at retaining the water flowing down the stream and through the landscape as long as possible. Restoration of the natural function of channel creation and formation.

2. TECHNICAL Securing the stability and safety of channels during increased flow rates and minimizing damage in the event of high water. Widening of channels with the use of ecological berms facilitating controlled flood flow effusion. Within the reconstruction of technical elements and bank lining, namely natural materials are used, such as stone, wood and vegetation elements.. Removal of former pipeline and concrete channels and their replacement with close-to-nature channels with vegetation accompaniment.

3. CULTURAL, HISTORICAL AND SOCIAL Increasing the awareness of Prague inhabitants about Prague streams, their history, and their role in the urban landscape. The restoration of the historical channels is based on contemporary documents and historical maps. Usage of watercourses as green corridors of the city and inclusion of revitalized areas into the citywide system of greenery with a high recreational potential. During the revitalization process, emphasis is placed on the aesthetic and recreational value of the landscape along the watercourses. Development of an information system promoting current projects. Information on projects that are currently underway is published on the websites www.praha-priroda.cz and http://envis.praha-mesto.cz. In addition, information boards may be found at the particular project sites.


Project results during 2005–2015

14

12,33

12

• By 2015, 12,3 km of streams were revitalized in the following phases: ‒ 1,1 km technically adjusted ‒ 5,6 km adjusted in a nature close way ‒ 5,6 km adjusted in a natural way. • Stream channels were extended by 3,5 km. • Within the revitalization 14.141 m of ponds were excavated. • Four steps were rebuilt to migratory permeable rocky slides. 2

10,348 9,003

10

7,508

8 6

4,418

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4,928

3,268

4 2

4,808

1,663 0,25 2005

0,29 2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

Increase in length of revitalized streams within ten recent years.


Žežulka Jenerálka Nebušický stream Zlatnice ký ec r á Š The stream o- am Krutecký stream Rokytka in the Stromovce ickstre v o Near the Hořejší Pond Over Lit Unearthing near the Hvězda the Hořejší Pond In front of the Ruzyně Prison Čihadla – Svépravický stream Below the Smetanka Čihadla Řepský stream Motolský stream In front of Fidlovačka

Cibulka The catch basin in Řeporyje

The Klukovice Swimming Pool

Dalejský stream

Revitalization in Dolní Počernice

Botič Záběhlice

Kozina square

Slatina

Chodovecký stream Košíkovský stream Zátišský stream

Baňský stream

Weir In Petrovice


Within the project the following revitalization actions were done: Hostavický stream – Revitalization Slatina Svépravický stream – Revitalization Čihadla II Hostavický stream – Revitalization in Dolní Počernice Nebušický stream – Revitalization under the Nebušický Pond Rokytka – Revitalization over the Hořejší Pond

9 25 10

2014

Řepský stream

23

2013

Zátišský stream – Stabilization of the riverbed Dalejský stream – Removal of the Klukovice Swimming Pool Rokytka – Revitalization below the Smetanka

26

2015

2012

2011

Chodovecký stream – Stabilization of the riverbed Litovicko-Šárecký stream – Revitalization in the Šárecké valley (Zlatnice, Žežulka, Jenerálka) Motolský stream – Stabilization of the riverbed Rokytka – Modification of the channel near the Hořejší Pond Litovicko-Šárecký stream – Revitalizace in front of the Ruzyně Prison

2010

Revitalization in the Stromovka Park

24

2009

Botič stream – Redevelopment of the channel in Záběhlice Botič stream – Revitalization anti-flood measures near Kozina square Cibulka stream – Unearthing of the channel Dalejský stream – Restoration of the catch basin in Řeporyje Litovicko-Šárecký stream – Unearthing of the channel near the Hvězda Game Preserve

04

18 22

8 21 11

2008

15

07 14

Rokytka – Revitalization of the Čihadla dry retention reservoir

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Botič stream – Revitalization of the Botič channel in front of Fidlovačka Baňský stream – Restoration of three stone dikes Košíkovský stream – Revitalization of the channel

03 01 12

2006

Botič stream – Wier In Petrovice

02

2005

Krutecký stream – Revitalization

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2007

16 17 20

05 06

www.praha-priroda.cz


REVITALIZATION OF THE BÁŇSKÝ STREAM

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Stone dikes before reconstruction

Natural channel of the Báňský Stream

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Restoration of three stone dikes

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The Báňský Stream springs in the district of Zbraslav known as Na Báních in Prague 5. The stream is 700 metres long and the difference in elevation of its upstream and downstream endpoints is 80 metres. Seven stone dikes were built along its course to reduce the gradient, as well as channel erosion. The three lower dikes were in a very poor condition. The Báňský Stream has the character of a torrent stream, its ravine cuts its way down a narrow gullet and overcomes a considerable difference in elevation over a relatively short distance. In terms of aquosity, the stream is largely dependent on precipitation, namely on storm rainfall. The upper half of the stream is without constant water discharge for a major part of the year. Continual discharge is noticeable only from the middle stream, which is fed by a fountain on the left bank. The revitalization of the Báňský Stream comprised the restoration of the three lower dikes, the cleaning of the pool at the first dike, the reconstruction of the inlet structure, and the revitalization of the channel. The repair works carried out on the dikes and the paving were aimed at restoring their original condition and appearance from the early 20th century. The masonry on the dikes and the stilling ponds was repaired and missing stones were replaced. The channel was cleaned; silt depositions and vegetation were removed from the bed. Sediments (gravel and mud silting, tree branches) were also removed from the pool at the first dike in order to restore sedimentation space near the exit of the stream from the woods where the underground pipeline was frequently clogged. The unsatisfactory inflow into the underground pipeline was replaced with a higher capacity inlet structure.

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Remodelled length: 500 metres | Restoration of three stone dikes | Total costs: 1,600,000 CZK

2007


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička EXECUTION PERIOD:

Dike function

Damaged dike walls

Cleaned dike pool

Newly repaired masonry

April 2007 – July 2007 TOTAL COSTS: CZK 1.6 million

Reconstruction of stone dikes from the early 20 th century | Cleaning of the channel | Remodelling of the pipeline inflow

1


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Original Petrovice Weir

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The weir on the Botič Stream in the district of Petrovice was built in the 17th century. Its main purpose was to increase the water level in the stream so that water could be diverted to a mill in Petrovice through a millrace. When the mill had been closed down after the World War II, the millrace was no longer serving its function and some of its parts were filled in. A few remnants of the millrace, however, are still visible on the right side of the Botič Stream below the weir and Euklidova Street. In the following years, the weir was rather neglected and it was gradually decaying. In early 2004, only a torso of the original weir remained standing with remnants of its sidewalls that could come tumbling down at any time. The banks above the weir were washed out at several places, the trees on the banks were bending over the stream, and the back of the weir was clogged with mud. Therefore, a project aimed at the reconstruction of the weir and the revitalization of its close surroundings was launched in 2004. With a view of its financial demand,, an application for the co-financing of the project from the EU structural funds and from the funds of the Ministry of Regional Development was submitted. The reconstruction of the weir commenced in March and it was completed in June 2006. Mud was removed from the area above the weir, the washedout banks were repaired with the aid of stone-filled wire mattresses that were covered with soil and planted with willow twigs. The original weir structure was replaced with a rough boulder ramp with several hollows, which serve as throughways for migrating fish. In order to eliminate any changes to the flood land in the district of Křeslice, the boulder ramp is of the same height as the preserved parts of the original weir. The original sidewalls were taken apart and rebuilt with new stones. The height of the walls was determined by the requirement for the future placement of a bridge over the Botič Stream that should be a part of the newly planned bicycle path.

Morseova

BOTIČ STREAM – WEIR IN PETROVICE

Reconstruction of the weir into the rough boulder ramp | Total costs: CZK 6,000,000

2006


Overview

Project funding

The project wa s co-financed from the eu structural funds (JPD2) and by the ministry of regional development

Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Nowastav a.s. DESIGNER: Atelier životního prostředí (Environmental Studio) Ing. Cyril Mikyška EXECUTION PERIOD:

Damaged banks above the weir

Remodelled bank with planted vegetation

Renovation and stabilization of the banks Construction of the rough boulder ramp

March 2006 – June 2006 TOTAL COSTS: CZK 6 million

Construction of the rough boulder ramp | Construction of the bank walls for the planned bicycle path | Reconstruction of the bank ruptures | Replanting of vegetation

2


REVITALIZATION OF THE BOTIČ CHANNEL IN FRONT OF FIDLOVAČKA

Map of revitalization

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The Botič is the largest and the best-known Prague stream. It springs to the southwest of Prague in the vicinity of the municipality of Čenětice. It flows into the Vltava River near the railway bridge at Výtoň. In the section in front of Fidlovačka, the lining of the channel had been in an emergency condition for some time. The section is 183 metres long and it begins at the bridge in Závišova Street in front of Fidlovačka and ends at the bridge in Na Folimance Street. The central concrete part of the stream bed was completely disintegrated, the remaining part was lined with disrupted stone paving and crumbling concrete. The channel slopes were covered with, among other plants, the tree of heaven and the hop tree, which are deemed invasive and undesirable plant species. Within the revitalization process, the channel was newly lined with stone paving and naturalized. The original paving and the remaining concrete were removed and the whole channel was thoroughly cleaned. The shape of the channel was newly remodelled so that instead of creating a straight ditch, the flowing water, waves at the bottom from one bank to the other. Five bends were built in this section. The original hard-concrete lining was replaced with interlocked stone paving laid in gravel. Similar techniques have been used since the early 20th century and may be seen at numerous places to this day. To reduce the purely technical appearance of the newly modelled channel, vegetation lining was also used in addition to stone paving. The vegetation lining comprises of various wetland plants in different colour and variety combinations that are planted onto coconut mats. The mats are then installed in prepared cassettes with the aid of which the stream bed is stabilized without any special maintenance requirements. Due to the large flow rates in the Botič Stream channel, stone rollers were placed on the sides of the mats to hold them in place and the mats were covered with nets. After the first vegetation season, each cassette creaNa ted a compact green isle in the paved channel. Pa

Remodelled length: 183 metres | Naturalization of technically remodelled channel | Total costs: CZK 7,000,000

2007


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER: Ekotechnik-inženýring s.r.o. Ing. Jiří Jílek EXECUTION PERIOD:

Installation of vegetation cassettes

Revitalized channel – the resulting state Installation of vegetation cassettes After the completion of construction work

July 2007 – December 2007 TOTAL COSTS: CZK 7 million

Removal of concrete cunette and replacement with stone paving laid in gravel | Cunette meandering | Installation of vegetation cassettes in the channel

3


BOTIČ STREAM – REDEVELOPMENT OF THE CHANNEL IN ZÁBĚHLICE

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Newly remodelled channel

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The channel of the Botič Stream in the district of Záběhlice was severely affected by human activity. Waste dumps, landfills, and illegally built structures in the close vicinity of the Botič Stream resulted in the total degradation of the channel at some locations. The waste dumps along the banks were gradually taken away by high waters and the vegetation growing on such sites was becoming a threat. The project of close-to-nature stabilization and cleaning of the channel focused on a 400-metre long section between Záběhlická and K Prádelně streets. Within the project, illegal structures were removed from the channel of the Botič Stream and some of the trees along its banks that could not be saved due to their extremely washed-out roots were felled. The stream banks were cleaned and stabilized with the aid of large boulders. Some of these boulders weighed up to 500 kg and were placed on top of each other to form the resulting shapes. The height of the lining was selected with a view to its function of protecting the surrounding land and it varies from 1 to 2.5 metres. In general, the project involved the remodelling and close-to-nature stabilization of the channel in the residential area with the use of natural materials, as well as the securing of the basic functions of the watercourse.

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Total length of the remodelled channel: 400 metres | Revitalization of the channel | Total costs: CZK 3,800,000

2009


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER:

Illegal waste dumps along the stream

Devastated channel

Access to the stream Liquidation of waste dumps

Atelier životního prostředí (Environmental Studio) Ing. Cyril Mikyška EXECUTION PERIOD: March 2009 – June 2009 TOTAL COSTS: CZK 3.8 million

Removal of illegal waste dumps and structures from the channel | Cleaning of the channel | Stabilization of the channel by rubble lining

4


BOTIČ STREAM – REVITALIZATION ANTI-FLOOD MEASURES NEAR KOZINA SQUARE

Situation before liquidation of waste dumps

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During the floods in 2002, some parts of the channel and the banks of the Botič Stream in this area were severely damaged and disrupted. In the past, the height of the left bank was artificially raised by construction waste. The bank, largely overgrown with black locust almost 1.5 metres high at some places, channelled high water during increased flow rates to the lower right bank, which caused the flooding of adjacent structures. As a part of anti-flood measures, the manager of the watercourse, i.e. the Department of Environmental Protection of the Prague City Hall, commissioned a project aimed at the overall revitalization and widening of this part of the channel. Within the execution of the project, the originally deposited construction waste was removed from the bank to a distance of approximately nine metres from the channel. The channel shape was remodelled in order to create a wide berm (bench) on the left bank, which is connected to the original terrain by an undulating slope with a 1:2 gradient ratio. The berm rises 20 cm above the water surface and it is shaped as a natural part of the channel. Two small pools were created and the channel was split into two branches. Larger boulders, on which not only animals but also passersby may rest or sit, were placed along the banks. Intensely exposed parts of the slopes were stabilized by boulder masonry. Grass was planted on the less exposed segments and the whole site is regularly mown. Overall, the project increased the capacity of the channel and concurrently transformed the whole area into a more nature-like landscape. It is the very first anti-flood protection project undertaken by Prague that offers a unique solution based on widening and naturalizing the watercourse channel.

Total remodelled length: 130 metres | The first revitalization anti-flood measures | Total costs: CZK 4,500,000

2009


Rekapitulace Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka

Removal of landfills

CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER: Aquatest a.s.

Eyot and access to water

New pool in the berm

EXECUTION PERIOD: April 2009 – August 2009 TOTAL COSTS: CZK 4.5 million

Widened channel at the higher flow rates

Removal of historical landfills and widening of the channel | Creation of ecological berm | Construction of pools | Replanting of vegetation

5


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The Cibuka Stream, which is the right-side tributary of the Motolský Stream, springs from a fountain beneath the rocky outcrops of the Vidoule Nature Monument. It flows through the woody landscape of the Cibulka area and continues along railway tracks before it flows into the newly restored Pod Dianou Pond. From there, it follows the road leading to wetlands below a cherry orchard, and at the statue of St. John of Nepomuk, it disappears in an underground pipeline. The original pipeline led from the Homolka dry retention reservoir up to the Motolský Stream. The revitalization project was focused on the restoration of the historical pond, the stabilization of the sunken channel and its unearthing in the vicinity of the Homolka retention reservoir. The project followed up with the initial revitalization phase, which involved the restoration of the Pod Dianou Pond and the renovation of the considerably decayed culverts beneath the local roads. Where the channel of the Cibulka Stream sunk too deep, the bed was stabilized with the aid of steps built either of stone or of logs placed crosswise to the channel and firmly mounted into the banks. This way, the gradual erosion of the channel was eliminated. According to historical records, a small pond was located above the statue of St. John of Nepomuk. Within the revitalization process, the historical water body was renewed by building a small pool with an overflow dike modelled to resemble a terrain fault. A part of the existing pipeline in front of the statue of St. John of Nepomuk diverts the stream away from this historical site and allows it to resurface near the dry retention reservoir. The newly built channel is 20–30 centimetres deep and its leads across the reservoir up to the dam where it flows into the Motolský Stream. Three smaller pools were built in the vicinity of the stream to liven-up the whole area. Overall, the project resulted in the extension of the channel of the Cibulka Stream and in the increased attractiveness of the Homolka dry retention reservoir, which had been used for recreational purposes rather scarcely until then.

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REVITALIZATION OF THE CIBULKA STREAM

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m

Area of dry retention reservoir before revitalization

290 metres of new water channels | 710 square metres of new water bodies | Construction of pools | Total costs: CZK 1,300,000

2009


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER:

Restoration of the original pond

Stabilization of channel with stone sill

Ekotechnik-inženýring s.r.o. Ing. Jiří Jílek EXECUTION PERIOD: April 2009 – July 2009 TOTAL COSTS: CZK 1.3 million

Restoration of the historical pond | Unearthing of the channel | Stabilization of the channel damaged by erosion

6


DALEJSKÝ STREAM – RESTORATION OF THE CATCH BASIN IN ŘEPORYJE The catch basin on the Dalejský Stream may be found in Ve Výrech Street in the municipal district of Řeporyje. In the past, there were two small ponds on the site. The upper pond no longer exists and the lower pond was rebuilt to serve as a catch basin. The main function of a catch basin is to catch sediments coming from upstream. The sediments are deposited in the basin and do not silt up the channel further downstream. In order to function properly, the catch basin requires regular cleaning. The catch basin was built in the early 20 th century and it was in a very poor condition. The original stone walls were disintegrating, the outlet structure was damaged and the whole basin was clogged with mud. This led the watercourse manager to a decision to completely reconstruct the whole basin. The stone embankment walls of the basin were repaired with the use of limestone, which was commonly used in the area. The discharge structure was rebuilt into a semi-circular overflow spillway with a gradually declining slide. Next to the spillway, a new outlet structure was built along with an access for vehicles. The original stone step above the basin – a remnant of the former upper pond – was taken apart and rebuilt into a rough boulder ramp. While the basin retains its primary sediment catchment function, it has been remodelled into a flow through pond. The project also involved the cleaning of the catch basin surroundings, liquidation of illegal waste dumps and removal of self-seeded ruderal vegetation, namely acacias. As a non-native tree, the acacia is considered an invasive species suppressing natural native vegetation. The project was closely linked to the previous phase, during which illegal waste dumps in Ve Výrech Street had been removed and the whole channel of the Dalejský Stream had been cleaned and remodelled.

Rough boulder ramp

Catch basin with slide

Restoration of the catch basin | Total costs: CZK 3,000,000

Overflow spillway with a slide

Spillway construction

2009


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: NAVIMOR – INVEST sp. z o.o. DESIGNER: Ing. Jiří Hybášek

Original spillway

Original step above the catch basin

Clogged catch basin

EXECUTION PERIOD: April 2009 – August 2009 Cihelna Řeporyje

TOTAL COSTS: CZK 3 million

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cleaning of channel

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Construction of the rough boulder ramp | Removal of illegal waste dumps | Replanting of vegetation in the stream surroundings

7


Dalejský CREEK – REMOVAL OF THE KLUKOVICE SWIMMING POOL

Banks after concrete removal

The new channel is tempting for the games eská

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The Klukovice swimming pool was built in the 1930s as a part of the sun baths. The original woodless valley and the nearby train stop ensured abundant presence of holidaymakers from Prague. Small depth, approx. 1.1 m, very cold water and frequent clogging of the swimming pool by mud and stones gradually worsened water quality and, last but not least, the shading of the beaches ended the activity of the swimming pool in the 1960s. Since then, the entire swimming pool fell into disrepair and up till now there have only been decaying concrete structures that have remained in the Dalejský Creek. In 2012 the flow manager decided to definitively eliminate the remains of the swimming pool and to return the natural look to the Dalejský Creek. In the spring of 2013 all concrete structures were knocked down. The left crashed bank was cleaned up to the rock wall, the right one was settled and left in the natural state. As there is a playground next to the creek, several gradual accesses to the water were created. After the flood in June 2013 the whole event was completed by nature itself and several gravel benches were created in the surroundings of the creek, which became a pleasant amusement for the visitors of the playground.

REMOVAL OF THE SWIMMING POOL

Liščí

Kuní

Sojčí

Length of the revitalization 125 m | Costs: CZK 1,000,000

Zaječí

Historical photograph of the Klukovice swimming pool

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Ha

Bu

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bla

Do

Klu

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2013


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Josef Richtera

Revitalized natural channel

The original concrete channel

DESIGNER:

Demolition of the concrete fortification The original inflow to the swimming pool

Ing. Zdeněk Viták EXECUTION PERIOD: January 2013 – March 2013 TOTAL COSTS: CZK 1,000,000

Removal of concrete structures from the creek | Cleaning the rocks | Adjustment of the surrounding banks

8


Hostavický Creek – Revitalization of Slatina Another revitalization of the Hostavický Creek was carried out in 2015 in Dubec above the Retention Reservoir Slatina in the length of 266 m. Originally there was a concreted channel of the creek, there were concrete steps and a gully holes. As a part of the revitalization the original channel of the creek was covered with a new, nature close, meandering channel which corresponds more to current demands for watercourses and nature conservation. Due to the fact that the rainwater from Mecholupy made floods above the reservoir, a large berm with pools for the conversion of large waters was created there. Just above the place, where the channel flows to the Retention Reservoir Slatina, the revitalization of the channel was terminated and the water spills into a small wetland. Revitalization was complemented by planting trees and shrubs and the whole berm was grassed over. The aim of this revitalization was to integrate the Hostavický Creek into the surrounding greenery and connect it to the Retention Reservoir Slatina. The project was co-financed by the Operational Program Prague – Competitiveness.

Deepening the pool

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Retention Reservoir Slatina

Uprav

Start of modification

Map of revitalization

K lesíku

Slatin

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Revitalization of the channel

pools

Length of revitalization 266 m | Landscape modification of the Slatina Retention Reservoir | Costs: CZK 3,900,000

2015


Overview

Prague & EU: We invest into your future, European Union

European Fund for regional development

Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková

Northern Pintail

CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička, Pavel Semecky DESIGNER: Ing. Jiří Hybášek

The channel before revitalization

The revitalized Hostavický Creek

European Fire-bellied Toad Little Bittern

EXECUTION PERIOD: March 2015 – October 2015 TOTAL COSTS: CZK 3,900,000

Recovery of the floodplain | Creating organic berm | Construction of pools of the total area of 1,150 m 2 | Vegetative treatment

9


Hostavický Creek – revitalization in Dolni Pocernice The last revitalization of the Hostavický Creek was accomplished in Dolni Pocernice in 2015. With respect to the property law relations the revitalization was proposed in the length of 1.1-2.0 km from the Ceskobrodska Street to the confluence with the Sterboholsky Creek. The stream served here ‘only for the transmission of water’ and its ecological, aesthetic and landscape value was minimal. The surroundings of the creek were modified rather into a park with several children’s playgrounds and forest with scattered greenery that was partly in a very poor condition, especially the vegetation of our non-indigenous Acer negundo with damaged stability. The aim of the revitalization of the Hostavický Creek was to integrate the watercourse into the surrounding greenery to increase the ecological, aesthetic and recreational potential of the area. As a part of the revitalization the whole area was first cleaned up and a larger sunken area called berm was created. A smaller meandering channel of the Hostavický Creek was modelled there. The small riverbed serves for normal flows, the berm serves for flood flows. The berm is grassed and integrated into the surrounding terrain in such a way that it gradually copies its surroundings. The original riverbed was covered almost in a full length. A section where the watercourses are flowing into the creek was only left in the original route. Several small water bodies have been created around the creek especially for amphibians. A visitor can walk along the creek on new gravel roads through the entire area. The original footpaths across the creek were left here and allow access to the locality from the Street V Zahorskem. Several benches were added along the paths and new play elements were placed in the playground. The project was co-financed by the Operational Program Prague – Competitiveness.

Pool

Deepening a new riverbed

Riverbed and pool

Mapa revitalizace

Revitalization of the riverbed

Length of revitalization 1 126 m | Construction of the berm and the meandering channel | Costs: CZK 3,900,000

pools

2015


Overview

Prague & EU: We invest into your future, European Union

European Fund for regional development

Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková CONTRACTOR: Stavby rybníku s. r. o. Ing. Martin Suchopár New riverbed

DESIGNER:

Rocky slide at start of modification

Sindlar, s. r. o. EXECUTION PERIOD:

The riverbed before revitalization

The revitalized Hostavický Creek

March 2015 – October 2015 TOTAL COSTS: CZK 3,900,000

Extension of the riverbed by 248 m | Creating organic berm | Construction of pools of the total area of 706 m 2 | Vegetative treatment

10


CHODOVECKÝ CREEK – STABILIZATION OF THE RIVERBED

Enlargement of the riverbed under the outflow of the rainwater drainage Bojanovick

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2011–2012

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Revitalized length of 256 m | Stabilization of the creek riverbed | Costs: CZK 1,300,000

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Stabilized riverbed

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The overall modification of the valley of the Chodovecký Creek took place in the mid-1970s in connection with the construction of the Southern Town. Three retention reservoirs were built on the creek. They are used to capture rain water in the territory of the Southern Town – Chodov. By bringing rainwater into the creek the riverbed capacity increased and the original natural riverbed had to be stabilized. Flagstones were used for fortification and the riverbed was straightened. This created too difficult element in such a gentle environment and the nature has shown its disagreement with this treatment very quickly. In 2011 there were only a few stones left in the 2.5 m deep shore instead of the original fortification. On both sides the entire valley was filled with soil and construction waste from the construction of the housing estates. Some of the trees are visible as they have been protruding from the concrete till now and they cannot be removed. The creek was newly stabilized by a heavy equatorial stone (so-called alpine treatment), which allows to create a stable but close to nature riverbed with pools and little weirs. Compared to the classical fortification there is much more water in this creek, which is oxidized in the little weirs and the pools serve as a home for many aquatic organisms. The surroundings of the creek were cleaned and new trees and wetland vegetation were planted here.


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Zdeněk Baloun DESIGNER:

Newly stabilized riverbed

Erosion depth of the riverbed

Original mouth of the creek Demolition of the damaged fortification

Ing. Cyril Mikyška EXECUTION PERIOD: June 2011 – July 2012 TOTAL COSTS: CZK 1,300,000

Stabilization of the damaged riverbed by a heavy stone layer | Construction of pools on the creek | Clean-up of the creek surroundings

11


REVITALIZATION OF THE KOŠÍKOVSKÝ STREAM

Stream after revitalization

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Damaged concrete lining

General map

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The Košíkovský Stream flows into the Botič Stream from the left side below the Hostivař Dam. During the construction of the Chodov housing estate, the upper part of the stream was diverted into an underground pipeline and connected to the storm sewer system. In the section between Mírového hnutí Street and the retention reservoirs, the stream channel was paved with stones laid in concrete. The vegetation that eventually started growing in the channel (i.e. self-revitalization) returned an almost natural character to the Košíkovský Stream. Despite its relative massiveness, the lining of the channel, especially in the section of two steps and the pipeline mouth, was of poor quality and thus frequent and extremely high flow rates led to the destruction of the steps, as well as the surrounding bed. Moreover, the extent of the damage was continuously growing. In order to stabilize the channel, the manager of the watercourse carried out repair works with the use of revitalization elements. The area around the pipeline mouth was newly paved with interlocked stone paving. The upper step was completely removed and replaced with a rough boulder ramp. The lower step was also removed and the channel was remodelled and widened to create a flow through pool. Hydrophilic plants were planted in the surroundings of the pool. In case of a straightened trapezoidal channel, such elements play a crucial role in the segmentation of the watercourse and thereby in increasing the environmental and aesthetic value of the stream. The revitalization project also included cleaning of both reservoirs where, in addition to excavating mud, minor repairs of various objects were carried out, as well as the renovation of the channel above the confluence with the Botič Stream. The whole project was finalized with extensive planting of woody and wetland plant species in and around the reservoirs.

Matúško

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Remodelled length: 390 metres | Replacement of lined channel with pool | Total costs: CZK 3,400,000

2007


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka

Washed-out „hard“ lining

CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER:

New pool in the stream

Rough boulder ramp below the pool

Atelier životního prostředí (Environmental Studio) Ing. Cyril Mikyška

Construction of the pool Rough boulder ramp

EXECUTION PERIOD: April 2007 – November 2007 TOTAL COSTS: CZK 3.4 million

Reconstruction of step to the rough boulder ramp | Renovation of paving | Building of small pools | Replanting of vegetation

12


REVITALIZATION OF THE KRuTECKÝ STREAM

Stream crossing

Pool in the Krutecký Stream after revitalization

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The Krutecký Stream is the right-side tributary of the Litovecký and Šárecký Stream. Its catchment area is situated on the southern slope of the valley of Šárka between the Džbán open air swimming pool and the Vltava River. The whole territory is a part of the Šárka-Lysolaje Nature Park and its most valuable sections have been declared a small-size protected areas. In this location, the Krutecký Stream may be divided into two characteristic parts. The first part (upstream wise) began at a culvert under a local road between a gardening colony and Horoměřická Street and it continued down a 100-metre long concrete channel. The second part, which is approximately 160 metres long, led through a concrete channel between Na Krutci Street and a ruderal meadow with illegal waste dumps. Due to the unfavourable condition, the Department of Environmental Protection decided to revitalize 260 metres of the Krůtecký Stream. All concrete gutters were removed from the first part of the stream and moderate bends were created on the channel between the forest path and the local road. The remains of the old straight bed were integrated in the new channel only in the form of several small pools. In the second part, the route of the channel was modified to allow the stream to once again meander along the valley line.. From the outlet structure, up to which a part of stream flows in an underground pipeline, the channel was diverted into the middle of a meadow to enable the meandering of the stream in a close-to-nature manner. In the central part, a small area with wetland and a 90 m2 pool with a maximum depth of 0.5 metres was created. With a view to the number of self-seeded ashes and maples on the meadow, the new route of the channel was adjusted to the existing young tree stand. In order to prevent the possible destruction of the new channels, the bends were reinforced with rubble. The banks of the new stream were planted with wetland vegetation and gravel crossings were built at the bend transient points. The project also included the reconstruction of the damaged pipeline outlet structure and the drainage of the local road. The original channel of the Krůtecký Stream was preserved in this section so it would serve as a roadside ditch leading into the watercourse. This revitalization was the very first project of the natural revitalization of streams carried out in Prague.

Length of new channel: 250 metres | The first natural revitalization in Prague | Total costs: CZK 650,000

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2005


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki

Construction of new channel

CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER: Ing. Jiří Hybášek EXECUTION PERIOD:

Stream meanders

Krutecký Stream before revitalization

Krutecký Stream before revitalization

May 2004 – July 2005 TOTAL COSTS: CZK 0.65 million

Filling of the original concrete channel | Building of the new close-to-nature channel | Building of small pools | Replanting of vegetation in the stream surroundings

13


UNEARTHING OF THE LITOVICKo-ŠÁRECKÝ STREAM NEAR THE HVĚZDA GAME PRESERVE

Original channel prior to construction of underground waterway e tan ic

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Unearthing of the channel

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Length of new channel: 280 metres | Unearthing of the channel | Total costs: CZK 10,000,000

2009

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Footbridge to Hvězda Game Preserve

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Newly remodelled channel

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The source of the Litovicko-Šárecký Stream may be found in the district of Prague-West, approximately 1.5 kilometres to the west of the municipality of Chýně. It flows through the Bašta Pond and continues through the Břevský, Kalu and Litovický ponds to the town of Hostivice. The stream then flows through the Strnad retention reservoir situated in the eastern part of the cadastral territory of Hostivice. Just before the Jiviny retention reservoir, the stream enters the territory of the capital city of Prague in the district of Ruzyně. From there, it flows to Liboc where it feeds the Libocký Pond and it continues via Vokovice to the Šárka-Lysolaje Nature Park where it flows through the Džbán water reservoir. The Litovicko-Šárecký Stream flows into the Vltava River near the east end of the nature park. In the 1960s, a massive project was launched, the aim of which was to divert the Litovecký and Šárecký Stream into a underground waterway leading under the Ruzyně Prison and all the way up to the Hvězda Game Preserve. The revitalized part of the stream begins at the mouth of the former underground waterway in the vicinity of the intersection of Ruzyňská and Stochovská streets. The underground waterway originally led under a green belt between the game preserve walls and Ruzyňská Street up to the intersection of Ledecká, Ruzyňská and Jinočanská streets. The underground waterway was of a 3 by 1.1 metre rectangular profile with an approximate width of 0.5 metres. It was built of U-shaped armoured concrete frames covered with armoured concrete panels. As a result, one of the major streams of Prague was ultimately degraded by the underground waterway to a lifeless sewer without any aesthetic or environmental function. Therefore, the Department of Environmental Protection of the Prague City Hall decided to execute a project aimed at the complete revitalization and unearthing of the Litovicko-Šárecký Stream along the Hvězda Game Preserve. The project involved the unearthing of a 280-metre long section of the stream. The original concrete waterway was removed along the whole length and the newly uncovered channel was remodelled in a close-to-nature manner. The bed and the banks of the newly uncovered channel are stabilized by rubble, as well as occasional vegetation lining. Alders and willow scrubs were planted along the banks and a new footbridge allowing access to the Hvězda Game Preserve was built below the existing bus stop.


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER: Ing. Jiří Hybášek

Newly remodelled channel

Stream before unearthing

Demolition of concrete waterway Demolition of the original and building of the new channel

EXECUTION PERIOD: August 2009 – December 2009 TOTAL COSTS: CZK 10 milion

Removal of concrete waterway | Building of new close-to-nature channel | Lining of the channel with rubble | Replanting of vegetation

14


Litovicko-Šárecký CREEK – REVITALIZATION IN FRONT OF THE Ruzyně PRISON

A stony riverbed with plenty of water and shelters

Newly modified riverbed

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The revitalization of the Litovicko-Šárecký Creek continued in the park in front of the Ruzyně Prison in 2011. Historically, there used to be a pond. In the 1960s the riverbed was straightened and concreted into a trapezoidal shape which resulted in the separation of the water element from the adjacent park. In addition, under normal flow conditions approximately 5 cm of water flowed down the bottom of the creek, which is wholly unsatisfactory for aquatic fauna and flora. As a part of the revitalization the original concrete riverbed was demolished and the creek, as well as the Hvězda Game Reserve, were stabilized by a heavy stone layer. Deep and shallower bundles were formed in the bottom, so that even under low flow conditions there was plenty of water in the riverbed. In order to interconnect water and the surrounding greenery the left bank was reduced in several places and a gradual access to water was accomplished. Several stones for sitting were placed on the shore. The revitalized riverbed was planted with wetland vegetation. The entire project contributed to the acclimatization of the whole area and returned life to Litovicko-Šárecký Creek in this area.

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Revitalized length of 120 m | Revitalization of the concrete riverbed | Costs: CZK 4,400,000

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Kralupská

Za humny Pod hřbit ovem

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Na Jivinách

The Litovicko-Šárecký Creek in front of the Ruzyně Prison, on the site of the former brewery

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2011

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Overview INVESTOR: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Vladimír Denis DESIGNER:

Newly modified riverbed

Creek before revitalization

Demolition of the concrete riverbed Creek before revitalization

Aquatest, a. s. EXECUTION PERIOD: August 2011 – November 2011 TOTAL COSTS: CZK 4,400,000

Removal of the concrete fortification of the creek | Construction of a new nature close riverbed | Stone fortification of the creek bed

15


Litovicko-Šárecký CREEK – REVITALIZATION OF THE THREE LOCALITIES IN THE Šárecké VALLEY Another modification of the Litovicko-Šárecký Creek was accomplished in 2012. The creek was revitalized in three localities in the Šárecké Valley. The properties owned by the City of Prague were selected for the revitalization. Prague – Žežulka location, Zlatnice and Jenerálka localities in the total length of 620 m of the original riverbed. In the locality of Žežulka the creek was historically pushed out to the edge of the valley wetlands below the forest and it was completely separated from the extracted sediments from the nearby meadows. The meadow was regularly sown and mulched and was not valuable from the botanical point of view. Approximately in its half it was divided by the waste from the historic buildings. The creek was converted to the centre of the meadow and modelled as a nature close meandering creek with pools and fords as a part of the revitalization. Prior to returning the creek to the original basin it was divided into two parts in order to improve the flow of the area. The shape and depth of the riverbed was based on the assumption that the revitalized riverbed should not moist the surrounding meadow because it was used for recreational purposes by residents. For better recreational use and maintenance a small wooden footbridge was built in the upper part. The original riverbed was covered with soil that was excavated during the construction of a new riverbed. During revitalization it was necessary to preserve as much as possible of the valuable and locally native trees, and so the creek riverbed could better fit into the new environment. At Zlatnice the creek originally copied the road in the Šárecké Valley and was put between the road and fences of family houses. Because of the confined conditions the creek was fortified by stone or concrete walls. On the other side of the road there was tall reed with fragments of valuable floodplain meadows and remnants of an old millrace. Due to the significance of the locality a botanical survey was carried out before the start of the works (Rezac 2012). The 11 kinds of plants from the red list were found here, such as hoary willow herb (Epilobium parviflorum), Berula erecta, Scrophularia umbrosa, Carex cespitosa or greater pond sedge (Carex riparia). When the revitalization was planned, the original passes were

used for the millrace and the creek was converted back to the 650-meter-long floodplain. Once again the meandering riverbed was created there with respect to the most valuable parts of the floodplain. The completion of the revitalization consisted of five pools, some of them are connected through the drainage directly with the creek. The original riverbed was left there to improve the flow of flood flows off the area. Water is driven to the revitalized and original channels by a distribution object made of large boulders. In this locality the depth of the new riverbed was given by the passes under the road at the inflow and outflow from the revitalized area. The remains of the original millrace were covered and, thanks to the clearing of the edge of the adjacent forest, the water, meadow and forest environment have been interconnected. To make the revitalization more attractive for the visitors, a grassy footpath was built through the middle of the meadow and a wooden footbridge across the creek. Based on the recommendations of botanists a part of the valley will be regularly mowed to allow the desirable development of rare plant species. The third location Under Jenerálka was the least affected by a human activity. Although the creek was historically pushed to the edge of the valley of the floodplain, due to its long-term use the original meadow changed into reed and the creek began gradually to meander. The target of the revitalization was to support the natural winding of the riverbed and create several pools in the locality. A part of the revitalization also included a revitalization of the Krutecky Creek, which was converted from the original concrete channel along the road to the floodplain, where it flows with other springs and flows into the Litovicko-Šárecký Creek. Subsequent care for the floodplain will be based on the overall subsidence of the site. The goal is to keep the mowing of the meadow on regular basis. Management will be based on the experience from the first year of revitalization. Completed revitalization was hit by flood in June 2013, which corresponded to a five-year flood. At all three localities water spilled into the floodplain and thus forming process of the riverbed started. Gravel fords and floodplains were created and the pools were formed there.

A new footbridge across the creek Map of Litovicko-Šárecký Creek in the area of the Džbán Reservoir from 1848

Flood area of current reservoir Dzban

Extension of the channel by 730 m | 1 000 m2 of new water bodies | Costs: CZK 3,700,000

Meandring river bed of Litocko-Sarecky Creek

2012–2013


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Pavel Semecký

New meander

Map adjustments – the Žežulka locality

DESIGNER:

Gravel deposits Construction of the new riverbed

Šindlar, s. r. o. EXECUTION PERIOD: September 2012 – May 20133 TOTAL COSTS: CZK 3,700,000 new pools REVITALIZATION

new pools

The original route of the stream chanell

Length of new river bed 197 m | New forrest pools construction of the area of 25 m2 | Covering of the original river bed | Vegetative adjustments

16


Meadow before revitalization New river bed

Map of adjustments – Locality Zlatnice

Blooming meadows along the creek

new pools

The original route of the stream chanell

REVITALIZATION new pools

Length of the new river bed 650 m | Construction of 7 new pools on the area of 440 m2 | Construction of pass

Pasture – maintenance of meadows


New pools

Map of adjustments - Locality Jeneralka

Blind stream branch

New pool

The original route of the stream chanell

new pools REVITALIZATION

The original route of the stream chanell

Length of the new river bed 117m | 3 new pools construction on the area of 568 m2 | Remaining a part of the original river bed as a blind stream branch


Motolský CREEK – stabilization of the riverbed

Newly modified riverbed

Newly modified riverbed

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REVITALIZATION

REVITALIZATION

Length of a treated riverbed 300 m | Revitalization and stabilization of the creek riverbed | Costs: CZK 660,000

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The Motolský Creek springs in Stodulky and flows into the Vltava River at the Palacky Bridge. The spring of the creek is located near the Zlicin underground station under the commercial and shopping area. Out of the total length of 9.9 km the lower part is totally covered part in the length of 4.2 km and the upper part is partly covered in the length of 5.6 km. The main tributaries of the Motolský Creek include the Broken Brook and the Cibulka Creek. On the stream there are five ponds and two dry retention reservoirs Homolka and Tatra Zlicin, which are used for capturing torrential rain. In its upper part the Motolský Creek flew through an open channel in the recent past and it was covered only at the intersection of the roads. With the development of transport and increasing requirements for building sites, in the first half of the 1980s almost half of the route of this upper part of the riverbed was unfortunately gradually covered. The constantly open part of the creek is therefore outside the spring part, only from the Motol Ponds to the Cibulka Pond. As a part of the construction of the Motol Ponds the riverbed of the Motolský Creek was straightened and fortified by the stone pavement. At normal flow rates, only a few centimetres of water flowed in and the creek was degraded to the melioration channel. During the local floods in 2011 several parts of original fortifications were devastated. In 2012 the surroundings of the Motol Ponds were revitalized and the damaged parts of the original fortifications were replaced by the boulders that laced the channel. A set of small pools and ponds were created there and even at smaller flow rates the riverbed is full of water. This method of fortification of riverbeds has become more and more popular in recent years and there is a high level of satisfaction with this. In contrast to hard fortifications (concrete, stone paving) large boulders adapt better to the riverbed and are much more resistant to flood flows. Another advantage is that the riverbed is not smooth and is therefore more suitable for aquatic animals, even under the low water conditions. The fortifications do not damage trees that grow in the vicinity of the creek.

2012

550


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Vladimír Denis

New riverbed

The original paved riverbed

Construction of the new fortified riverbed The original damaged riverbed

EXECUTION PERIOD: January 2012 – March 2012 TOTAL COSTS: CZK 660,000

Removal of damaged fortifications | Cleaning the riverbed | Stabilization of the riverbed with heavy stones | Construction of pools in the riverbed

17


Nebušický Creek – revitalization under the Nebušický Pond

A new riverbed

Construction of the fortification

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REVITALIZATION

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Outflow from the pipeline

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The Nebušický Creek springs in Nebušice just above the village square pond (formerly a fire tank). In the surroundings of the pond the creek is hidden in a pipeline and comes back to the surface in the Street Pod Hláskem. Approximately after 250 m, thanks to the permeable subsoil, the water in the creek disappears and appears in the Nebušice Retention Reservoir under the sewage treatment plant. It flows together with the Litovicko-Šárecký Creek under Jenerálka where it enters the private Pond Dubak. Due to the development of the new sites and the increase of the proportion of paved areas in Nebušice, the rainwater that flows into the stream has increased significantly in recent years. Because of the unstable subsoil, the erosion and recession of the riverbed have soon followed. At some places erosion ridges reach up to 2.5 m of the erosion groove. Some private parcels in the neighbourhood were also threatened. Within the revitalization, the Nebušický Pond was stabilized by a 120-meter-long channel with a heavy stone level, so-called mountain treatment, that is increasingly used in Prague and there is a positive experience with it. The erosion grooves were covered with clayey soil and treated with geotextile in order to avoid further subsoil excavation. A part of the project also included the regulation of the riverbed over the Nebušický Pond. The stream was originally stabilized by the gutters. This neglected area was revitalized into a recreational park. The riverbed of the creek was cleaned, the gutters removed and replaced by the stone fortification and stability thresholds. The left bank was modified in several places to access the water. There was a small pond nearby.

Length of modification 130 m | Stabilization of the channel under the Nebušický Pond | Costs: CZK 1,200,000

2014–2015


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková CONTRACTOR: Nowastav, a. s. Representative: Ing. Daniel Grosman DESIGNER:

A new riverbed

The original riverbed

Ing. Zdenek Viták

Isolation of the bottom of the new riverbed New fortification of the riverbed

EXECUTION PERIOD: November 2014 – May 2015 TOTAL COSTS: CZK 1,200,000

Stabilization of the damaged riverbed by a heavy stone level | Pool construction on the creek | Gradation of shores

18


REVITALIZATION OF THE ČIHADLA DRY RETENTION RESERVOIR The revitalization of the stream channels in the area of the Čihadla dry retention reservoir is the largest and the most extensive close-to-nature project aimed at revitalizing watercourses in Prague and its surroundings. The Čihadla dry retention reservoir was built in the 1980s and its primary function is to retain storm rainfall from the Rokytka catchment area. The reservoir is built on the site of a large pond, which had served its purpose until the 18th century when it was gradually drained and transformed into agricultural land. Within the construction of the dry retention reservoir, the channels of the Hostavický, Svépravický and Ro¬kytka streams from their confluence with the Hostavický Stream were straightened and lined with concrete blocks. Since the whole area is designated for the spreading of flood water, the straightening and lining of the channels was purposeless and it only depreciated the value of the location, which is a part of the Klánovice-Čihadla Nature Park. The revitalization process began with the filling of the old, high-capacity channels lined with concrete, and it continued with the excavation of new, close-tonature channels that would be shallow and meandering. Small pools were created at the crossings of the new and old channels. The banks of the pools have gradually declining, as well as steep banks to allow the development of fauna and flora. Additional ponds were built from a part of the original channel of the Rokytka, particularly at locations where tall trees are growing from the bed. In addition, new footbridges across the streams were built and information boards dedicated to revitalization and protection of the environment were installed as a part of the project. The new channels were planted with 200 young trees, namely alders, ashes, maples and oaks, as well as with shrubs solely from our native woody plants, such as black thorns, guelder roses, spindle trees and willows. The pools and certain sections of the channels were also planted with wetland vegetation, e.g. irises, loosestrifes, and various grass species.

Vegetation in the new pool

Original straightened channel of Rokytka

The second largest revitalization project in the Czech Republic | Total costs: CZK 17,100,000

Original straightened channel of Rokytka

2007–2008


Overview

Aerial view of dry retention reservoir

Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER: Ekotechnik-inženýring s.r.o. Ing. Jiří Jílek EXECUTION PERIOD: July 2007 – April 2008

▼ Dry retention reservoir during 2002 floods

TOTAL COSTS: CZK 17.1 million

Construction of new close-to-nature meandering channels | Construction of pools | Planting of wetland vegetation, trees and shrubs

19


REVITALIZATION OF THE ČIHADLA DRY RETENTION RESERVOIR

Rough boulder ramp Construction of new channels

Gravel bed layer

New meander of Rokytka

The use of vegetation lining along the banks

Footbridge over the stream

Total length of new channels – 1 605 metres: Svéprávický Stream 1132 metres, Rokytka Stream 200 metres, Hostavický Stream 273 metres


Project funding

T h e p r o j e c t w a s co-financed from the eu structural funds (JPD2) and by the ministry of regional development

The pool with frog bit

New pools with wetland vegetation

Aerial view of the pool

Life in a pool The pool with pondwort The pool with floating heart

Total revitalized area – 27 hectares | Total area covered by new water bodies – 7 800 metres


ROKYTKA – MODIFICATION OF THE CHANNEL NEAR Hořejší POND Rokytka near the Hořejší Pond has undergone many major changes in the last century. It originally flew directly through the Hořejší Pond. In 1961 a dividing dike was built and the pond was rebuilt to the side pond, as a part of the reconstruction of the pond and the natural swimming pool. To fill the pond a stage was built on the basin and the riverbed was paved. Down the stream an experimental hydrostatic weir, called the Jermaruv weir, was built. The Rokytka riverbed was converted and concreted into the shape of a trapezoid under the pond within the construction of the Prumyslova Street. As a part of the revitalization of this part of Rokytka the remains of the non-functional Jermaruv weir and the accompanying concrete structures were removed. The height difference of the channel above and below the weir was solved by a boulder slip. The boulder slip also replaced the original step of the pond. Both slides are accessible for fish that occur in Rokytka. The concrete riverbed under the pond was knocked down and replaced by a heavy rock boulder, so-called alpine treatment. The bottom was left natural with mosaic seated stones and stone thresholds. Thus a nature close and steady riverbed was built which provides space for living of aquatic plants and animals.

Rocky slide

Stabilized riverbed

Stabilized riverbed

REVITALIZATION Replacement of concrete steps

Length of adjustments 1 060 m | Replacement of concrete steps with boulders | Costs: CZK 9,000,000

2012–2013


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Vladimír Denis

New rocky slide

Original concrete step

Demolition of concrete fortification Rocky fortification construction

DESIGNER: AŽP – Ing. Cyril Mikyška EXECUTION PERIOD: September 2012 – December 2013 TOTAL COSTS: CZK 9,000,000

Stabilization of damaged river bed by heavy rocky bowlders | Removal of concrete fortification | Surrounding banks clean up

20


ROKYTKA – REVITALIZATION OF THE CHANNEL BELOW SMETANKA Rokytka also experienced significant changes under the hill of Smetanka. Historically there was a meandering riverbed and even a millrace. In the 19th century Rokytka was there and the surroundings were covered. The shores then overgrown by impassable clusters of the acacia. The revitalization in this part of Rokytka included the removal of landfills, extension and division of the riverbed and creation of the organic berma. Two small islands and one kingfisher wall were built in the basin. They have often occurred in this area but did not have suitable nesting conditions. Several trunks from the surrounding felled trees have been inserted and stabilized the creek. They will serve as dead wood in the water, which is a very important part of aquatic ecosystems. Thanks to this the illumination aquatic vegetation have appeared in the creek, for example watercourses. A part of the revitalization was modification of the confluence of Rokytka and Mala Rokytka where up to 2 m of landfill was removed and a pleasant access to water was created. Thanks to the revitalization measure Rokytka has become a part of the urban recreational greenery in this area. At many places it is very convenient to come down directly to the water surface. One of the islands was immediately occupied by children as pirates of Hrdlorezy.

Newly modelled riverbed

Small Rokytka

Modelling the shores

Ăşprava koryta

Length of revitalization 530 m | Channel extension Costs: CZK 2,500,000

2013


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Josef Richtera

A new rugged riverbed

The original riverbed

Modelling the shores Clearing banks from self-seeded trees

DESIGNER: Šindlar, s. r. o. EXECUTION PERIOD: July 2013 – November 2013 TOTAL COSTS: CZK 2,500,000

Ecological Berma Contruction | Clean-up of the surrounding banks | Dumping and landfill

21


Rokytka – Revitalization over the Hořejší Pond The Rokytka riverbed over the Hořejší Pond was straightened at the beginning of the 20th century and the shores were planted with almonds and pear trees. Due to the long-term neglected maintenance, however, they grew up along with raid vegetation. The Rokytka riverbed itself was degraded into a channel for the drainage of fast water. The bottom of the creek lacked fragmentation and the left bank was inaccessible, completely devastated by large nutria colonies. The entire riverbed of Rokytka over the Hořejší Pond was transmitted into meadows on the left bank within the revitalization. The target was to create a nature-friendly, winding and shallow riverbed as it looked before the regulation. In order to maintain the growth of the capacity profile, about 20 m wide berm was formed in the middle of the meadow and the new riverbed was formed. Several small water bodies were created in the curves and a place, where a perpendicular wall for the Kingfishers was to be built, was found. During the construction of the berm it was found out that the entire meadow was fouled to 1.5 m height in the past. Apparently, it was silted up with mud from the Hořejší Pond. The original Rokytka riverbed was covered. To increase the protection of the surrounding properties, the meadow near the building was increased by about 0.7 m. As a part of the project there was a cycle path around the mill constructed. All in all, the connection of the aquatic environment and the surrounding area have become more attractive.

The revitalized Rokytka riverbed

Gradual shores attract to the water

Deepening a new riverbed

Map of revitalization

pools Revitalization of the riverbed

Length of modification 518 m | Creating a new nature close channel | Costs: CZK 9,700,000

2014–2015


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Josef Richtera

A new meandering riverbed

Area before revitalization

A new riverbed during the construction

DESIGNER: Šindlar, s. r. o. EXECUTION PERIOD: April 2014 – April 2015 TOTAL COSTS: CZK 9,700,000

Covering the original channel | Construction of pools, cycle paths and protective dams Restoration of the pear trees | Construction of a „loggery“

22


Řepský CREEK – Revitalization of the Creek It took time to realize that revitalization of the Řepský Creek was very demanding. The first obstacle to the project that lasted several years was the construction of the Prague orbital which did not include the Řepský Creek. The solution was found in 2006 when the slip road from the Karlovarska Street was built. During the construction of the drainage of the road the interconnection of the ditches with the rainwater sewer system was successfully introduced, leading further to the Litovicko-Šárecký Creek. Thus, the access to the Řepský Creek was opened and the first stage of the project could start. It was the connection of the drainage water, which flew into the detention basin Repy III, then continued directly into the riverbed of the Řepský Creek, and cleared the channel along the allotment. In 2010 another part of the revitalization took place. It consisted of ploughing the Zalansky Street and the connection of the drainage water from the existing rainwater sewer system into the Pond Pisecak. During the excavation there was an interesting moment from a historical perspective when the drainage monument of the monastery was historically discovered. The last stage of the revitalization, which started in the area of the Lake Hlinik and led to the Penny Market, was again suspended for several years due to a complex and unsettled property-law relations. All necessary authorisations were obtained in 2012 and a year later a building permit was issued. The aim of this last part of the project, which was carried out in 2014, was to bring water from the lake Hlinik under the railway line and the Street Na Chobote to the area above the Penny Market. The creek appears on the ground level for the first time there and as a small natural creek it flows through greenery under the housing estates to the Penny Market where it is hidden in the pipeline once again. Initially there was an equipment for the construction site of Repy settlement at the place of revitalization. Because of the excavation of the new riverbed, various building remains, panels and burdens were revealed. First, the corridor for the new creek had to be excavated and backfilled in a width of about 3 m. After that the riverbed could be dug. It was then stabilized with gravel. Several small pools were built along the creek and the opened riverbed is planted with trees and wetland vegetation.

New riverbed and pools

Length of revitalization 707 m | Renovation of the disappeared creek | Costs: CZK 2,600,000

River bed cleaning

Creek renewal

2010–2014


Overview Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Martina Buchtíková

Isolation of the new riverbed

CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Vladimír Denis

Area before revitalization

DESIGNER: Ing. Jiří Hybášek

Deepening the new riverbed Stabilization of the riverbed with gravel

EXECUTION PERIOD: 2010 – July 2014 TOTAL COSTS: CZK 2,600,000

Riverbed restoration | Pool construction | Planting trees and wetland plants

23


REVITALIZATION IN THE STROMOVKA PARK

Newly landscaped pool

Revitalized channel

Original pool

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The stream in the Royal Game Preserve is not a natural watercourse. Originally, it served as a tail race for a pond founded by Emperor Ferdinand I in 1548. During the reign of Emperor Rudolph II, a new large pond was built with an area of 20 hectares. It was fed by water from the Vltava River, which was supplied by the so-called Rudolph‘s Tunnel leading through the Letná Hill. The tunnel has been supplying water to all existing ponds in the Stromovka Park to this day. The revitalization was the result of the longterm unsatisfactory condition of the stream. Due to its minimum gradient and relatively large water depth (up to 1 metre), the stream was continuously clogged with leaves and sediments and required regular cleaning. The channel was often 2 or even 3 metres wide, with deep and almost vertically washed out banks at many locations as a result of frequent cleaning. Overall, the stream seemed quite gloomy and neglected, particularly in the newly renovated areas of the park. In 2010, the Department of Environmental Protection of the Prague City Hall decided to revitalize the channel. The revitalization included the narrowing of the channel to a width of 1.5 to 2 metres, the stabilization of the channel and the banks with boulder masonry, and the shallowing of the channel in order to lower the water level to approximately 20 centimetres. The boulder bank lining was chosen in order to ensure maximum resistance to erosion caused by the large number of ducks and swimming dogs. The slope of the stream banks was reduced to a ratio of 1:1.5-1:2, with the local, moderately declining access ways to the water. Naturally, ensuring access to water and interconnecting the park with the stream were one of the main objectives of the revitalization project. The banks of two lagoons situated along the stream were revitalized in the same manner. In addition, large boulders, which rise above the water surface, were installed in the lagoons.

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Length of revitalized area: 390 metres | Stabilization of the channel | Total costs: CZK 2,600,000

2010


Overview Investor: City of Prague Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Jiří Karnecki CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague) Watercourse Department Representative: Ing. Ondřej Palička DESIGNER:

Original wide channel with washed-out banks Reconstruction of stairs prior to inflow into pipeline

Landscaping and moderation of the bank slopes

Stream after revitalization

Ekotechnik-inženýring s.r.o. Ing. Jiří Jílek EXECUTION PERIOD: October 2009 – September 2010 TOTAL COSTS: CZK 2.6 million

Reconstruction of lining at pipeline inflow | Channel narrowing and stabilization | Bank slope moderation | Replanting of vegetation

24


REVITALIZATION OF Čihadla II – Svépravický CREEK

A new bridge

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Map of the revitalizatione

A new pool at the Pond Martinak

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Revitalization of the riverbed pool

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A new riverbed

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This revitalization is built on the modifications made in 2008 and covers the area between the Dry Polder Čihadla, the Pond V Piskovne and the Pond Martinak. Its main part, which was completed in 2015, is the modification of the originally straightened Svépravický Creek, which served more like a drainage channel here than a creek. The bottom of the creek was increased by 1.5 m and a new meandering riverbed, locally stabilized by a stone basin, was modelled in the newly emerging area, which reached up to a width of 10 m. The concrete step into the sandpit at the millrace was cancelled and replaced by a short stone slide, thanks to which the riverbed was widened and a small water area was created here. This modification consisted of the reconstruction of the bridge across the creek. The original concrete channel from the outflow from the Pond Martinak was covered and the newly built drain now has the shape of a nature close riverbed with gradual shores. In the field, next to the Martinak, a new 1,800-square-meter pool was built. The preparation and the runoff from the Pond V Piskovne also passed through the revitalization. The water from the sandstone originally flowed to Rokytka. However, now it has a new outflow which supplies the adjacent wetland in the western part of the Piskovna with water and the water is then goes back to the Svépravický Creek. As a part of the revitalization the path from the Svépravický Creek to the ford via Rokytka was strengthened. The project was co-financed by the Operational Program Prague – Competitiveness.

Length of revitalization 542 m | Modification of the riverbed of the Svépravický Creek | Costs: CZK 5,300,000

2015


Overview

Prague & EU: We invest into your future, European Union

European Fund for regional development

Investor: City of Prague, Department of Environmental Protection of the Prague City Hall Investor’s representative: Ing. Jiří Karnecki, Ing. Richard Polifka, Ing. Martina Buchtíková CONTRACTOR: Nowastav, a. s. DESIGNER: Ekotechnik-inženýring, s. r. o., Ing. Jiří Jílek EXECUTION PERIOD:

A new natural riverbed

The original concrete riverbed

Expansion of the riverbed Demolition of the concrete fortification

April 2015 – September 2015 TOTAL COSTS: CZK 5,300,000

Pool construction | Removal of the concrete fortification | Meandering the riverbed | Vegetative treatment

25


Zátišský CREEK – STABILIZATION OF THE RIVERBED

Stabilized riverbed

Revitalized riverbed

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Length of the revitalization 840 m | Stabilization of the riverbed | Costs: CZK 2,200,000

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The Zátišský Creek springs in Lhotka under a former swimming pool and the three ponds are built there: The Pond U Vodotoku, the Zátišský Pond and the Hodkovicky Reservoir. In the 1970s an extensive stabilization of the riverbed and its straightening was carried out within the process of building up the sites in the surroundings of the Zatisske Valley and the sedimentation of rainwater from the surrounding settlements into the creek. The river was stabilized by wooden fences and stone steps. The Pond U Vodotoku and the Zátišský Pond were repaired, as well as the Hodkovicky Reservoir. However, the volume of water in the Zátišský Creek was greater than the newly modified riverbed could hold and soon the destruction of the fortification of the riverbed took place. The local stream had left the original riverbed completely and created a new riverbed nearby. The largest erosion groove was up to 4 m deep and the private land in the neighbourhood was also endangered in some places. The removed material then trapped in the reservoirs on the stream. Within the revitalization the stabilization of the channel was accomplished at some places by means of a heavy stone equatorial, so-called mountain treatment, which has been increasingly used in Prague with a very positive experience. The remains of the original fortifications were removed and the steps were replaced by stone slides and gravel beds. Erosion grooves have been stabilized so that no further deepening could appear, but at the same time, the perpendicular banks for nesting of the kingfisher have been kept. Several pools were built on the stream and in its surroundings. The modification of the right shore under the Sanatorium Pronatal, where a large number of black dumps were located, was a part of the project. The whole area was cleaned and greened.


Overview INVESTOR: City of Prague, Department of Environmental Protection of the Prague City Hall Investor‘s representative: Ing. Richard Polifka CONTRACTOR: Lesy hl. m. Prahy (Forests of the City of Prague), Watercourse Department Representative: Ing. Ondřej Palička, Zdeněk Baloun DESIGNER:

Stabilized riverbed with a pool after revitalization

Deep erosion of the riverbed before í

Remains of the stone layer Works on fortification of the riverbed

Ekotechnik-Inženýring, s. r. o. Ing. Jiří Jílek EXECUTION PERIOD: September 2012 ‒ August 2013 TOTAL COSTS: CZK 2,200,000

Stabilization of the damaged riverbed by heavy stones | Construction of pools on the stream | Making shores gradual

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Profile for Pražská Příroda

10 years of revitalization projects in Prague  

Potoky pro život ‒ Streams for Life PROJECTS COMPLETED FROM 2005 TO 2015

10 years of revitalization projects in Prague  

Potoky pro život ‒ Streams for Life PROJECTS COMPLETED FROM 2005 TO 2015

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