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D
The Allan Water catchment has 3 Potentially Vulnerable Areas to flood risk as determined in the National Flood Risk Assessment 2009. The scoping study for this project used hydrological modelling that identified the Knaik subcatchment as contributing on average 23% of the flood peak which occurs in the most downstream PVA in the catchment. Hillsides with fast flow pathways due to hill grips is one reason the Knaik subcatchment has such an impact on the Allan Water flood peak. The project identified an area of the Knaik subcatchment where extensive hill grips were present and work was possible. By using measures such as peat dams and wooden sediment traps, fast water conveyance was attenuated and the blanket bog habitat was restored.
The Dunruchan Farm Peatland Restoration Project restored 48.2ha of extensively drained upland blanket bog at just under 300m altitude by using approximately 790 peat dams, 10.4km (10,365m) ditch and gully reprofiling, 6 wooden sediment traps, one 10m bund, 30m worth of in-ditch bunds and 7 plastic dams.
Research opportunities to look into the impact of the project on downstream flood risk and wider ecosystem benefits are currently being investigated. The Knaik subcatchment covers 39km² while the restored area is 0.482km² (1.2%), and so the effect may only be local. If the project's impact is considered as part of a wider network of NFM measures in the Allan Water catchment, however, the cumulative impact may be more significant. +
R
The Allier river, 421 km long, is a tributary of Loire.
In 1985, a hydropower plant is built on the banks of the Allier.
The dam, 14 m high, creates a water reservoir of about 900 m with 30000 m3 of sediment trapped. No fish pass is installed.
In 1050 the hydropower plant was sold to EDF, who applied for a renewal of the hydropower license in 1993.
In January 1994 the dam was included under the “Plan Loire Grandeur Nature”, because of his impact on ecological continuity; The renewal of the hydropower license is not granted and the hydropower plant and dam are demolished.
The works consists on three phases:
• in November 1996, the plant was demolished;
• in January 1997, an additional drain valve is placed. The water is drained during floods, to dilute the sediment at the bottom of the reservoir;
• In spring 1998, the Allier is diverted and the dam is demolished with dynamite, because the location of the site does not allow to access with dismantling equipment. The site is then restored. +
L
The Alster river is 56-kilometer-long, originates near the community of Henstedt and ends with its estuary into the river Elbe in Hamburg. The best-known part of the Alster is the Alster Lake, which is formed in the inner-city area of Hamburg by the Inner and Outer Alster. Since 2011, the cooperation project “Lebendige Alster” works to improve the ecological condition of the Alster, with its various, sometimes rare, habitats, and to raise awareness of nature conservation. Like many other rivers the impact of urban development is evident in e.g. biodiversity and hydromorphology. Some of these manmade impassable constructions can already be overcome. Due to newly built fish ladders migratory fish can return to the Alster, but then end up in the poorly structured and not very natural area of the canal (Fleet). The absence of natural vegetation confronts many water organisms with difficult living conditions. Here numerous innovative measures to create new living spaces have already been implemented in the canals and the project aims to add more.
During the day, the water in the Alsterfleet is dammed and drained at night, creating strong currents. For this purpose, a “current cocoon” has already been inserted into the canal to create sheltered zones during strong currents. An old typical cargo ship (Grüne Schute) was also rebuilt into a vegetation rich area, where fish and insects can access the Schute through recesses in the ship's side and in the floor. The roots of willow and alder, reeds and aquatic plants offer protection, are hiding places and sources of food. Besides offering positive effects to the surrounding vegetation, the Grüne Schute is also used as an educational venue to allow schoolchildren, citizens and other interested parties to participate in the project and to provide environmental education.
Outside of urban Hamburg, numerous habitat types which have become rare were designed in the first part of the project. A shortage of dead wood, as a result of regular removal, was counteracted with controlled tolerance of deadwood accumulations. Introduction of mobile deadwood as well as installation of individual trees including crowns resulted in improved hydromorphology. The gravel-gap system of the riverbed as an important habitat was supported with the removal of sand, installation of gravel depots on undercut slope areas, narrowing of waters with gravel made flow deflectors.
In addition to the near-natural development of the Alster waters, there are also improvements in local recreation and environmental education.
R
The Alt is a small, low energy urban river which had been historically re-sectioned, straightened and over deepened. The river flows beside a road and was constrained within a trapezoidal channel. Improved water quality had seen fish return to parts of the river but further improvements to the riverine habitat were desired.
Consultation with local authorities, community groups and local schools took place during the design and construction phases. Options were limited by planning permissions on parts of the site and the existence of a wildflower meadow. Improving public access to the river was a very important element of the scheme.
The 1.5m, 30 degree banks were excavated back on either side of the existing course and up to 30m width of 'floodplain' was created. This comprises a mix of a main and braided channels separated by marginal berms. The new course was approximately 25% larger and deeper than the braided channels to encourage the majority of low flows along this route.
Initial earthworks have delivered access and recreation improvements along this stretch of the Alt. Reedbed habitat has established reinstating a locally rare habitat. However, this has also has some negative impacts in that biodiversity has been limited by reedbed monoculture and encroachment of the reedbed has reduced velocities increasing siltation and reducing flow variation as a result.
Minimal management has been undertaken since the project work and as a result the site has become overgrown with vegetation and some of the braided side channels have become choked. Tree work is underway as is work to re-open the braided channels (part of Knowsley 2020 Project). The project would have benefited from a tailored long term management plan.
Water quality appears to have improved with the number and density of pollution sensitive invertebrates increasing since the works were carried out.
Anecdotal evidence suggests that people are happy with the scheme. Knowsley MBC is undertaking further works to open up the riparian corridor and is currently installing a cycle path.
Community involvement - Consultation with local authorities, community groups and local schools took place during the design and construction phases.
A
The Amerongse Bovenpolder project aims to improve biodiversity, function as a green corridor, maintain and improve landscape, and to improve conditions for recreation and cultural-historical values. The polder has been previously used as a landfill, for sand excavation, and for tabacco cultivation.
Rijkswaterstaat and DLG Government Service for Land and Water Management created a 45 acre seepage swamp to improve conditions for the variety of flora and fauna in the Bovenpolder. The marsh is fed by clean groundwater (= seepage) from the Utrecht Heuvelrug (hill ridge). Seepage swamp is an ideal habitat for plants that need (iron rich) groundwater such as water gillyflower, mare's-tail and sedge species.
In the coming years, an old river channel will be dug outin the Bovenpolder and semi-wild horses and cattle graze the area. These measures will make the Bovenpolder suitable habitats for amphibians, small mammals, insects and marsh birds such as night heron and black stork.
Ecological connections between the Utrechtse Heuvelrug the Bovenpolder will also be restored in the future, by the constructing a wildlife crossing allowing birds and mammals to pass unhindered from areas high-up to low down by the river, and vice versa.
The development of the Amerongse Bovenpolder is a collaboration of the Province of Utrecht, DLG Government Service for Land and Water Management, the Ministry of Agriculture, the municipality of Amerongen, Hoogheemraadschap (water board)The Stichtse Rijnlanden and Rijkswaterstaat. +
The Anloërdiepje is a tributary of the Drentse Aa, which has a generally good or average ecological condition. In order to improve ecological conditions and meet WFD criteria, the mowing regime in the Anloërdiepje was altered. See also: http://www.rtvdrenthe.nl/nieuws/168154/Waterschap-verhoogt-beken-Drentsche-Aa-gebied-Omliggende-natuur-kan-zo-natter-blijven +
The Apelnäs powerplant was built in 1940. In 1995 a denil fishway was built and adapted for a minimum amount of water 300 L/s. A fish counter was placed at the upper end of the fishway. It was noticed that fish only migrated downstream, not upstream. The reason was that the fish could not find the fishway and there was still too little amount of water. A pool-type fishway (on left-hand side in the picture) was decided to build because it was not possible to build a bypass channel because of steep steepness and rock-bedded bottom. The realisation of the new fishway was 2009. After the finish of the pool-type fishway, the water flow was increased from 300 to 600 L/s for two months annually. In addition, the power plant will every September and October be turned off entirely for 10 hours on one day a week. This will provide an attraction flow for migrating trout during its spawning time.
To consider the eel, the top of the fishway walls were made slope and a little amount of water was entered to there. The idea was to have moss growing there, since it is excellent climbing material for eels. Also some 50 mm holes were made to the walll of the fishway to help the migrating eels to swim through them. +
B
The Asón River source is located in the '''Collados del Asón Natural Park'''. It flows through habitats classified as of Community Interest. These are the habitats of species of great interest such as Pyrenean musk rat, wolf, salmon and European bison. Downstream, where the waters from the river meet the sea, are the Santoña salt marshes. This site is an important staging post on the migration route for hundreds of species of birds, which congregate there during the winter. Three sites representative of the valuable ecosystems along this river have been proposed for inclusion in the Natura 2000 network.
The aims of the project comprise not only the hydromorphological restoration of the river, but the conservation of the entire river basin. The project carries out diverse actions in three areas of the basin: at the head, in the middle, and at the estuary. The measures at the river include environmental education information and awareness at the interpretation centre of the SCI. The improvement of instream habitat for salmonids, the recovery of otter, silvicultural treatments and hydrological study are some of the actions developed.
This project counts with the support of local, regional, national and European institutions. The financing comes from the LIFE initiative, the Consejería of Agriculture and Fisheries, Ministry of Environment, INEM and Caja Cantabria.The total budget was of 1,233,905.50 €. The UE cofinanced part of the project with 616,952.75 € from the Life initiative.
Environment, INEM and Caja Cantabria. +
R
The Aume is a 32 km long tributary of the Charente. It has great potential for eel, sea trout and brown trout. Its watershed is primarily agricultural.
The Aume has undergone many morphological alterations. Between 1960 and 1995, the river was straightened, dredged and its cross-section modified in order to drain the marshes and make the cultivation of corn possible. This caused riverbed incision and lowering of the groundwater table. In order to try to stop this process raising the water level a series of 20 weirs made with planks was built.
However, they caused silting, favoured eutrophication and induced longitudinal fragmentation.
The plank weirs are kept open during the winter (October 15 to early May), except for the pont Paillard one, which had remain closed for ten years.
The “Syndicat de rivière intercommunal d’aménagement hydraulique du bassin de l’Aume – SIAHBAC” (grouping of local administrations for the hydraulic management of the Aume basin) is the owner and manager of all of these works. As part of the new strategy of SIAHBAC, which aims to meet the objectives of the Water Framework Directive, it was decided to test the removal of planks at the pont Paillard site.
The objectives of the action were to restore ecological continuity (for fish and sediment) and a more natural flow regime; moreover, to educate local stakeholders in this type of operation, to promote further restoration activities.
The work, on a secondary, disconnected arm of the Aume, consisted in the mere removal of the wooden planks of the weir, entailing practically no costs. The concrete structure is retained, in order to make the measure reversible in case of failure (not all the farmers supported it). No planting or any other action in the riverbed was performed, in order to follow the natural evolution of the river. +
L
The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen.
The three interventions in Gatzaue in 2005, 2009 and 2011 included removing a total of 50000 m3 of gravel from the formerly disconnected floodplain, widening the riverbed by approximately 35 m and, in order to stop incision, the construction of a ramp in 2005 and, in 2009 and 2011, the reintroduction in the same stretch of part of the gravel excavated from the river banks. A monitoring activity was implemented to study the geomorphological and biological effects of the project.
Works include: Creation of new lateral habitat for fishes,amphibians and birds (alcedo atthis). +
The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen.
The riverbed widening in "Molini di Tures", the first of the series of measures implemented along the Aurino from 2003 on, included removing a total of 9500 m3 of gravel from the disconnected floodplain, doubling (from 30 to 60 m) the width of the river and recreating secondary branches. A monitoring activity has been implemented to study the geomorphological and biological effects of the project. +
The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen.
The intervention in "San Giorgio di Brunico" was carried out by removing a total of 17000 m3 of gravel from the disconnected floodplain, almost doubling the width of the riverbed. Excavated gravel was reintroduced in the riverbed and shaped to restore a more natural section, then left to natural dynamics. +
The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen. +
A
The Avon Barriers project is a partnership project between the Rivers & Fisheries Trust for Scotland (RAFTS), SEPA, South Lanarkshire Council and the Clyde River Foundation. It seeks to open up fish passage across two weirs on the Avon Water. The project is currently at the end of the feasibility & optioneering phase and is currently in a review period to select the best option for both weirs from those identified, to proceed to design and build.
This project has been funded through the Water Environment Fund (WEF) administered by SEPA on behalf of the Scottish Government, with contribution from South Lanarkshire Council. The project has been managed by RAFTS.
By opening up fish passage across these two weirs almost 35km of salmonid spawning habitat will be accessable, improving the regeneration of the Clyde catchment as a valuable salmon fishery.
For further information on the Water Environment Fund please visit: http://www.sepa.org.uk/water/water_environment_fund.aspx
For further information on the project please examine the individual barrier project pages for Fernegair Weir and Millheugh Weir. +
T
The Axe and Exe River Improvement Project (AERIP) is a partnership project using Catchment Restoration Funds to undertake river catchment restoration on the Axe and Exe. The partnership, led by the Westcountry Rivers Trust, has been carrying out river restoration and undertaking works to address the causes of Water Framework Directive issues for many years.
Through restoration work the project will address issues including: barriers to fish migration, preventing fish from reaching their natural spawning grounds; diffuse pollution, the run-off of soil and nutrients which cause damage to spawning grounds and a negative impact on the wider river ecology;interrupted conveyance of river gravels reducing the spawning habitat for trout and salmon; degraded river corridor habitat, including the impacts from abandoned tree coppice and excessively eroded and poached riverbanks damaged by stock access. +
B
The Babingley River rises from chalk springs above the villages of Flitcham and Hillington in North West Norfolk. The Hillington site is located close to the source and includes an impounded online lake known as the ‘Broadwater’. The aim of the project was to revert 420m of lake back to river in order to improve the water quality, remove barriers to fish and eel passage and provide additional spawning habitat for wild brown trout (Salmo trutta). Sluice boards (1.15m high) at the downstream extent of the site were removed resulting in the lowering of the water level. This concentrated the flow and enabled the river to cut a new channel that would be more sustainable in the long term. Deflectors were installed in the downstream extent of the reach (where gradient and flow velocities were less) to concentrate flow further and enable the river to continue cutting a channel into the newly exposed silt. Improvements in water quality as a result of the work created better habitat and spawning grounds and the removal of the sluice boards allowed free passage for fish to access these areas. However, lowering the water level created a barrier at the upstream weir, which had to be addressed using a pool and traverse fish easement created with rock rolls. +
"
The Bages County Council is carrying out the project Green River II. Restoration of riparian forest and the rivers Llobregat and Cardener, which provides for actions in 8 areas of activity, among which is the area's Corbatera. The area includes the banks of the Llobregat River from the dam to the confluence with the Corbatera and Gavarresa stream (municipal Salient).
The Green River II project is the result of collaboration of different authorities: the Bages County Council, the Catalan Water Agency, the Province of Barcelona and the 8 municipalities of Bages involved in the action. The planned investment in this area is 497.000€. +
B
The Ballinderry Freshwater Pearl Mussel Rescue Project (2013-2015) aims to save the Ballinderry freshwater pearl mussel from extinction by addressing the issues in the catchment which are preventing them from naturally recruiting and to raise awareness of this globally endangered species amongst the community.
The mussels in the Ballinderry are unique in that they are genetically distinct from all the remaining populations in Northern Irish rivers and, without intervention, at their current rate of decline will be extinct by 2098.
The project focuses on the upper 127km2 of the Ballinderry River catchment, County Tyrone, Northern Ireland. This catchment includes the main channel of the Ballinderry from its source at Cam Lough in the Sperrin Mountains to Cookstown (located half way down the Ballinderry River) and eleven tributaries. Within the project area, the Ballinderry River is designated as a Special Area of Conservation and an Area of Special Scientific Interest.
The £444,000 project has employed three dedicated staff members and delivered over £160,000 of silt remediation and river restoration works over 20 kilometres to improve the river to a standard in which freshwater pearl mussels can naturally reproduce and survive to adulthood.
In order to achieve our aims we have been:
1. Identifying the pressures in the catchment which are preventing mussels from naturally recruiting and surviving and addressing these issues at the catchment-scale.
2. Establishing a sanctuary population of freshwater pearl mussel comprising regrouped dispersed adult mussels and released captive-bred juvenile and young sexually mature adult mussels, complimented by improved stock densities of host fish.
3. Improving the captive-breeding programme and determining how young a captive-bred mussel can be released to the wild.
4. Delivering a learning and outreach programme aimed at the wider public through a variety of outlets and resources.
The methods used for identifying, planning and implementing silt remediation and education, outreach and communications were fully researched, evidence-based and defined as part of a six month project planning phase that saw, scientists, ecologists, conservationists, educationalist and statutory and non—statutory bodies contribute to a suite of project plans including a Conservation Plan, Education Plan, Volunteer Plan, Marketing and Communications Plan and an overarching Activity Plan.
The Activity Plan provided determinate targets against which the success of the project is measured.
R
The Beaume river, a tributary of Loire river, is 10 kilometers long; 2,7 Km before the confluence with the Loire, the river forms a natural waterfall 27 meters high. The ecological quality of rivers is quite good.
In 1907, a 6.10 meters height dam is built, for the hydroelectric power plant of Fatou. The utilization of this plant stops in the sixties. The dam blocks the ecological continuity.
Approximately 6,000 m3 of sediment has accumulated behind the dam.
During 1985 the dam has become public property.
For security reasons related to poor condition of the structure, it is decided to erase it.
The work consists on the completely removal of the dam and factory building. +
B
The Beekloop is a mostly man-made stream that originates in the woods between Aalst and Hezen and discharges into the Kleine Dommel near the Hulsterbroek natural area. The stream is located on the edge of the higher Kempens Plateau (Belgium) and a lower area in Noord-Brabant (Netherlands), which results in a relatively large bed slope. The Beekloop was part of several stream restoration projects between 2010 and 2015, some which can be classified as traditional stream restoration and some of which focused on Building with Nature.
One of the main Building with Nature measures that were carried out is the introduction of dead wood in the stream. In addition, specific flora were introduced to improve the flow conditions. +