Property:Project summary
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This is a property of type Text.
R
The industrial site in Hondouville was constructed in
the beginning of the 1900s as a textile factory. A weir
was built across the Iton with a bypass leat leading to a
mill, called the Plis mill. The outdated Plis weir measured 1.1 metres high
with the gates closed and 0.8 metre with the gates
open. It caused numerous malfunctions in the river,
including a break in sediment transport, an obstacle
to the passage of trout and eels, degraded water
quality, a more uniform flow pattern and siltation
of habitats (an impounded reach extending 600 metres).
In addition, the Courtieux stream flowed through
the industrial site, itself located in a floodable zone,
before reaching the Iton. In the lower section, the
stream runs through a culvert, but due to its poor
positioning, the stream is clogged with sediment
over more than 350 metres, with as a result a break
in continuity between the stream and the river.
Finally, there was a risk of accidental pollution due
to the position of the Courtieux stream and the factory
leat in the middle of the industrial installations
and no means to control the water entering or exiting
them. The position of the factory wastewatertreatment
plant, on an island in a floodable zone,
was also a problem.
Saviton informed SCA Tissue France on the problems
caused by the Plis weir, on the possibility of a public
subsidy to remove the structure and proposed providing
assistance to the industrial company during
the operation. SCA Tissue France had no further use
for the weir and wanted to avoid incurring costs for
its maintenance, consequently, it accepted the idea
of removing it.
The fact that the company owned the meadow opposite
the site was a chance to restore the flood storage
zone and to reduce the flood risk for the factory.
In addition to removing the Plis weir, the final
project included filling in the factory leat to improve
access to the wastewater-treatment plant, bypassing the Courtieux stream to avoid the industrial site and
the creation of a wetland in the meadow opposite
the site. SCA Tissue France decided in favour of the
project given that it was economically beneficial for
site operation and corresponded to its environmental
values.
The work took place in three phases:
The gates, concrete glacis and spillway were removed.
The factory leat and part of the low-water
channel upstream of the weir were dredged. The
island downstream of the factory channel was eliminated
to enable a distribution of flows similar to that
prior to the works.
The future riverbed was dug out, the banks were
graded to a slight slope and replanted. The former
bed was filled in with landfill from the new bed.
The bunds along the banks were removed to create
a wetland and the section of the lot along the Iton
was cleared.
The factory channel was filled in with the landfill from
the meadow. The banks along the industrial site were
reinforced with sheet piles to protect the buildings.
The outlet of the wastewater-treatment plant, originally
in the factory channel, was extended to the Iton.
F
The initial scope of the project was to assess the overall structural and hydromorphological condition of the watercourse running through Saltburn Valley Gardens to identify areas on potential improvement.
Three areas were identified as requiring intervention within the gardens where the part of the watercourse was beginning to effect infrastructure, namely the miniature railway line and the public car park or deposition is severely reducing the capacity of the channel. Given the lack of infrastructure surrounding the remainder of the watercourse this will be left to its natural processes. The first of the areas is located at the downstream end of the watercourse, at the confluence of Skelton Beck, Millholme Beck and the sea. At this location rapid erosion is taking place of the right-hand bank due to frequent inundation and the diversion of flows caused by silt deposition upstream, the second area of interest. The third area of interest and focus of this entry, is an area at the upstream end of the gardens adjacent to the final platform of the Saltburn Miniature Railway. This rapid response watercourse was regularly inundating the miniature railway and washing away both river bank and the sub base the tracks are laid on. The erosion was taking place on the outside of a sharp bend in the watercourse and various methods had pervious been tried to halt the erosion. All of these has subsequently failed leaving an area of bare earth with embedded pieces of gabion basket and other failed erosion protection measures.
A feasibility study was then undertaken considering the following options:
Do nothing
Use of local tree root balls to be imbedded in the bank with willow revetment
Use of vegetated bags with large stone revetment
Inclined gabion stone baskets.
Sheet piles with coir matting, willow faggots and rock rolls
A matrix scoring each option against environmental, economic and technical criteria was created and option 5 was selected offering erosion protection, flood protection and environmental benefits.
Detailed design, specification, construction drawings, method statement and environmental risk assessment were produced to allow the flood risk activity permit to be granted and the contractor to undertake the work. The works were undertaken in line with the methods statement approved by the Environment Agency which included a number of silt curtains and use of biodiesel.
R
The intervention area is a stretch of the stream of Vallicrosa on the edge of the town of Sant Hilari Sacalm. This is a highly degraded area due to the old water bottling plant. Due to the proximity of the town center, is a highly frequented area so you get a strong human pressure. This proposal aims to improve the river area, both the length of public water and adjacent land that make up the biological corridor associated with the river.
The main objectives of the project are to promote and enhance diversity, regeneration, structure and composition of the vegetation; reduce the risk of overflow of the stream and increase stability against disturbance in areas with consolidated uses; changing the topography of the land to support the natural dynamics of the river; ensure the implementation process of vegetative cover from seed, branches, living plant or planting; protect, stabilize and temporarily slow erosion of the slopes and banks of rivers with plant alive until woody vegetation to develop sufficiently to perform this function; reduce speed and volume of surface runoff by promoting infiltration of water; restore landscapes with mixed techniques.
The project has a total budget of 139.972,28 € and is financed by the Municipality of Sant Hilari Sacalm. +
F
The interventions carried out on the Montone river are part of a general project dating back to the '90s called "Fiumi Puliti” (Clean Rivers); the main goals of that project were the “maintenance” of river beds of the Romagna area, the reduction of flood risk and the implementation of the Montone River Natural Park, in the Municipalities of Forlì and Castrocaro.
The main tool put in place to achieve these objectives was to return to the river part of the floodplains, both public domain and private, that had been separated from the river due to the construction of embankments. Since 1992, this strategy has allowed to recover, within a relatively short stretch of the river, a storage capacity of more than 2,500,000 m3. This space was returned to the natural flood dynamics lowering the alluvial plane and/or displacing the embankments to the external borders of the floodplain.
In the area just upstream the confluence with the Rabbi Stream, the works included the removal of some embankments (in red in the picture) and the reconstruction of a portion of an embankment in a backward position (in green). It is foreseen to remove further embankments (in yellow), so as to ensure to both rivers a wider speace for hydromorphological dynamics. +
The interventions carried out on the Montone river are part of a general project dating back to the '90s called "Fiumi Puliti” (Clean Rivers); the main goals of that project were the “maintenance” of river beds of the Romagna area, the reduction of flood risk and the implementation of the Montone River Natural Park, in the Municipalities of Forlì and Castrocaro.
The main tool put in place to achieve these objectives was to return to the river part of the floodplains, both public domain and private, that were , separated from the river due to construction of embankments. Since 1992, this strategy has allowed to recover, within a relatively short stretch of the river, a storage capacity of more than 2,500,000 cubic meters. This space was returned to the natural flood dynamics lowering the alluvial plane and/or displacing the embankments to the external borders of the floodplain.
The San Tomè area, located near Forlì, before the project was private cultivated land (orchards), former floodplain, surrounded by a main embankment and separated from the river by a secondary one, strongly reducing its flooding frequency. The works, carried out between 2004 and 2007 by the Servizio Tecnico di Bacino Romagna (River Basin Technical Services part of the Emilia Romagna regional administration) included the removal of the internal (secondary) embankment and lowering and reshaping the floodplain, on 9 hectares. This allows an increased flooding frequency, with a positive effect on flood risk downstream.
Project costs included approximately 440,000 € for land expropriation. The estimated 2 million € for earth moving were compensated for by part of the excavated material, that was made available to the company performing the works. This funding approach may be considered negatively under a geomorphological perspective. However, it has to be underlined that the sediment extraction (ranging between 2 and 5 m) from the (former) floodplain has not reduced the amount of material potentially available for erosion and transport downstream (and finally for coastal sediment supply); in fact the excavated areas were already outside the river mobility corridor, they had become terraces, mostly protected against erosion along all the banks. Moreover part of the fine material with no commercial interest was introduced in the river bed during some ordinary flood events, in order to increase (at least occasionally) the sediment supply downstream.
E
The invasion of the fluvial public domain with intensive agriculture (olive), the effect of livestock and of the canalization of the river has caused significant erosion by the removal of riparian vegetations and an increase in sediment load in the river basin.
The project included revegetation and protection of the banks through bioengineering techniques.
This project counted with the support of local, regional and European institutions. The financing came from the LIFE initiative and the Consejería of Environment, Andalucía. +
R
The investment was necessary because of the large amount of occasional and extreme amount of rainfalls and meltwaters caused serious problems in the surrounding communities for many years mainly because of the increased sediment deposition in the streambed. During the project, a total of 38 600 m3 sludge was removed from the steam. Landscape remediation was done on almost 50 thousand square meters of land. Spawning areas were constructed for native protected fish species, such as spined loach and weatherfish. +
A
The location of the project is in the North bank of the Salcott channel tributary of the Blackwater Estuary (Essex). The strategy was creation of new coastal (mudflat, saltmarsh, transitional grassland and grazing marsh) and freshwater habitats, together with the provision of natural flood defence. In order to achieve tidal inundation of the area available (49ha of the 85ha scheme are intertidal), five breaches were required along 3km of hard defences. The largest breach was 100m in width with a level of +1.5m OD (approximately MHWN), and the remaining four breaches between 10-20m (at higher levels). The main breach was included to moderate outflow by acting as a sill, reducing the tidal prism of the site, and controlling the phasing of exchange between Salcott Creek and the site itself.
Phase 1 of the scheme was undertaken in 1996 and consisted of a regulated tidal exchange on part of the site (20ha). Pre-breach, a three year monitoring programme was undertaken to ensure appropriate scheme design for the site and to provide a baseline for determining its effects. Following realignment, a further five year monitoring programme was established to assess the effects and provide further information for the design of future schemes. Monitoring undertaken:
Accretion / erosion. +
R
The lower River Dearne had suffered substantial changes to its natural gradient as a result of subsidence problems cause by deep mining operations. To alleviate this problem a new straight and over-wide river was created in the 1970s to ensure efficient evacuation of floodwaters.
This resulted in physical uniformity of the channel, poor water quality and a lack of habitats for fish and other species.
The restoration scheme drastically reduced the width of the channel (10m to 5.5m) by creating a sinuous course and low flow channel using large boulders to create berms. Flood capacity was maintained by ensuring the in-channel structures were kept to a low level and the berms were designed to be submerged during high flow events. The design included three small backwaters and scrapes and the low berms were created at a variety of levels to enable the establishment of a range of riparian communities and provide habitats for a range of species.
Reduced maintenance (est. £2, 500-£3, 000 reduction in maintenance costs per year) +
The lower Sella has a condition considered the best in the territorial scope of the Hydrographic Confederation of Cantabrian but presents problems of morphological alteration, degradation of riparian vegetation and recreational pressure
The main objectives of this project are: Recover fluvial processes with which the river can rebuild a more dynamic and natural flow; Make the river increase their resilience to natural or human disturbances, defined as the ability to recover its natural state after a disturbance of natural and/or human; Encourage the creation of a sustainable structure and compatible land uses and river resources agreed by the society; Recover the beauty of the river and its banks, as well as the emotional relationship between man and his land and river landscape; Comply with the requirements of the WFD. +
U
The main River Frome Unit 3a flows mostly through the Moreton Estate. This reach in particular is downstream of the Hurst road bridge. It was historically part of an old mill system and the reach retains a fixed crest weir at the location of the former mill. Removal of the weir was discounted early on due to costs and possible impacts on the road bridge. Works were concentrated on the reach between the bridge and the weir looking to improve the channel and bank structure and creating a greater range of habitats in particular for fish.
The River Frome Rehabilitation Plan states the main proposals to improve the SSSI condition and WFD objectives of Unit 3a and to incorporate as part of the Hurst Bridge Project are: a) increase / diversify channel bed profile creating deep pools and gullies and b) to introduce large woody debris to provide in channel habitat and vary bed profiles through scour and deposition. +
B
The main aim of the Quercus project is preventing crime. This part of the project restores an historic feature on the river and incorporates a settling tank to contain sewerage overflows following heavy rainfall, which could previously have contaminated the river. On top of the settling tank, a small riverside open space is being created. Opposite the Bastion itself, improvement works were being carried out to the banks and shallows, to create wetland habitats and wildlife corridors, known as ecological linking zones. +
R
The main aim of the project is the flood protection of the towns of Babócsa, Lábod, Szabás and Nagyatád. As a result the channels will be able to handle the reference flood water output levels. On the deepening sections, further deviances will be stopped by raising and stabilizing parts of the bed. Small rivulets will be restored on an ecological basis, taking into account the wildlife of the river, for example with ensuring longitudinal penetrability for fishes by means of fish passes. +
The main land use is intensive forest exploitation but the territory is fragmented among private owners. Carrying out Inappropriate forestry practices promotes soil loss (erosion problems). Allochthonous species are also found on the banks, such as pines and eucalyptus. The sediment transport negatively affects Urdabai estuary. They are also quite frequent flooding in the neighborhoods that are located in the flood plain at the mouth of the estuary.
The main objective of this project is the maintenance and enhancement of biodiversity and ecological status of the banks to fulfill their ecological and social functions.
The project has a total budget of 300.000€ and is financed by the Consejería of Environment. +
The main objective of the LIFE STRŽEN project is to improve the conservation status of the Habitats Directive priority habitat, Turloughs, by restoring the former Stržen riverbed. The watercourse will be prolonged by 1.5 km. This will have several positive effects, including an increased saturation of soil with water that will improve conditions for characteristic species of fish, invertebrates, birds and mammals. The project also aims at reducing the negative impact of visitors on the restored riverbed area and establishing quiet zones in the breeding habitat of the Eurasian bittern (Botaurus stellaris) in order to improve its breeding success. A further aim is to gain long-term support for its conservation actions among the general public, and a positive change of attitude among key stakeholders. Thus, the objectives are strongly linked to the EU Habitats and Birds directives, Biodiversity Strategy 2020, and Water Framework Directive. <br>
Funding - EU Contribution: € 2,863,212.00 +
L
The main objective of the project is to promote and support the environmental recovery of the Segura River Basin by improving and strengthening the connectivity between natural ecosystems, promoting the conservation of the area and improving its public use by:
1. Increasing the river ecosystems continuity and permeability in order to restore its natural dynamics and the mobility of the species along the Segura and Moratalla rivers
2. Combating ecosystem degradation and fragmentation to restore their role as ecological corridors
3. Improving the ecological status along both rivers
4. Increasing biodiversity of fluvial and riparian ecosystems
5. Promoting social awareness
6. Disseminating knowledge and transferring the results to the Segura River Basin Management Plan and to other areas with similar environmental problems +
S
The main objectives of this project concerned the reduction of flood risk and of nutrients supply to Venice Lagoon to avoid eutrophication; in the same time an increase of biodiversity was expected. These different objectives have been reached by a number of restoration actions: river section enlargement, increase of sinuosity by the creation of new meanders,in-stream and out-stream wetlands and adoption of new practices in river management to permit a complete or partial preservation of aquatic vegetation; the creation of 4220 m.of new woody riparian buffer was mainly done for nutrient removal. +
R
The main objectives of this project concerned the reduction of flood risk and of nutrients supply to Venice Lagoon to avoid eutrophication; in the same time an increase of biodiversity was expected. These different objectives have been reached by a number of restoration actions: river section enlargement, increase of sinuosity by the creation of new meanders,in-stream and out-stream wetlands and adoption of new practices in river management to permit a complete or partial preservation of aquatic vegetation; the creation of 1600 m.of new woody riparian buffer was mainly done for nutrient removal. +
The main objectives of this project concerned the reduction of flood risk and of nutrients supply to Venice Lagoon to avoid eutrophication; in the same time an increase of biodiversity was expected. These different objectives have been reached by a number of restoration actions: river section enlargement, increase of sinuosity by the creation of new meanders,in-stream and out-stream wetlands and adoption of new practices in river management to permit a complete or partial preservation of aquatic vegetation; the creation of 4,200 m.of new woody riparian buffer was mainly done for nutrient removal. +
A
The measure serves the purpose of ecological and hydrological improvement of the river Mur over a length of about 1400 m by dismantling the left bank.
In order to promote the erosion of the left bank, initial erosion scars (bays, excavation of approximately 15,000 cubic meters) were created and four temporary islands were built from pouring the existing excavated material into the Mur River.
The removal of bank protection and the therewith connected erosion will establish breaklines and a natural shoreline. Eroding banks and gravel bars will form new habitats for typical animal and plant species in and at the water. +