Case study:Removal of five Lakes on the Val des Choues stream

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Location: 47° 47' 6.39" N, 4° 44' 38.98" E

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Project overview

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Status	Complete
Project web site
Themes
Country	France
Main contact forename	Bertrande
Main contact surname	Barre
Main contact user ID
Contact organisation	Office National de Forêts
Contact organisation web site
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Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Val de Choues stream is a tributary of the Ource and is 5.5 kilometres in length. In 1968, with a view to salmonid farming, the ancient Narlin pond, originally created by the monks of a local abbey, was transformed into a complex of five ponds. This fish farm proved to be unprofitable and was abandoned in 1973. The fragmentation of the stream by the ponds modified the environment and increased the fragility of the crayfish population (the watercourse was cut off from its main tributaries, temperature changes occurred, there was influx of undesirable fish species and an obstacle was created to the free movement of fish and crayfish). In the framework of the “LIFE” Nature Programme, this site was chosen for a project concerning the restoration of white-clawed crayfish. The water bodies were drained in two phases. In June 2006, the three upstream ponds were drained and the fish were rescued. The embankments were opened in August. In September 2006, the two remaining downstream ponds, which until then had been acting as sedimentation basins, were drained and the embankments were then opened in November. The most upstream pond could not be removed due to its major heritage value (historic and faunistic). This pond was linked to the other ponds by the watercourse and a parallel canal (created for fish-farming purposes). In order to reduce the drying out of the watercourse, the entire flow emerging from the pond was redirected towards the stream by dismantling the dividing weir that was responsible for supplying water to the canal and by partially filling in the upstream section of this canal. Developments were made in order to diversify the habitats in the original watercourse (laying of limestone blocks) and a gate was installed in the upstream water body.

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Image gallery

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The most upstream pond is retained. It is a site of heritage interest (historic and faunistic).

The preserved heritage pond embankment.

The Val des Choues stream reforming its bed in the sediment left by the ponds (March 2009).

The new sinuous course of the stream in June 2009.

The Val des Choues stream within the impoundment area of the former ponds. Detail of particle size in the watercourse in June 2009.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Seine-Normandie River basin Subcatchment River name Val des Choues Area category 10 - 100 km² Area (km2) 18 km²1,800 ha <br /> Maximum altitude category 500 - 1000 m Maximum altitude (m) Dominant geology Calcareous Ecoregion Western Highlands Dominant land cover Woodland Waterbody ID Site Edit site Name Villiers-le-Duc WFD water body codes FRHR4 WFD (national) typology WFD water body name Pre-project morphology Embanked Reference morphology Sinuous Desired post project morphology Heavily modified water body true National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Quick run-off, Artificially regulated Dominant substrate River corridor land use Woodland, Extensive agriculture Average bankfull channel width category Less than 2 m Average bankfull channel width (m) 22 m <br />0.002 km <br />200 cm <br /> Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient 0.01 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 700 m0.7 km <br />70,000 cm <br /> Project started Works started 2006/06/01 Works completed 2007/01/01 Project completed Total cost category 50 - 100 k€ Total cost (k€) 50 k€50,000 € <br /> Benefit to cost ratio Funding sources European Commission, French Ministry responsible for Environment, Regional Council, Rhône, Water Agency of Mediterranean & Corsica and Seine-Normandy Regions, EU LIFE Programme Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 10 - 50 k€ 13 k€13,000 € <br /> Stakeholder engagement and communication 1 - 10 k€ 5 k€5,000 € <br /> Works and works supervision 10 - 50 k€ 50 k€50,000 € <br /> Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Reservoir impoundment Hydromorphology Width & depth variation, Continuity for organisms, Continuity of sediment transport, Quantity & dynamics of flow Biology Fish: Species composition, Fish: Abundance Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Removal of impoundments, Removal of derivation of watercourse Other Non-structural measures Management interventions Social measures (incl. engagement) Other River contract Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Quantity & dynamics of flow Yes Yes Yes Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Yes Improvement Invertebrates: Taxonomic composition Yes Yes Improvement Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Case study description by ONEMA (French National Agency for Water and Aquatic Environments). Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information