Case study:Restoration of the previous riverbed of the Dadon

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Status	Complete
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Themes	Habitat and biodiversity, Hydromorphology, Water quality, Monitoring
Country	France
Main contact forename	Regis
Main contact surname	Talguen
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Contact organisation	d’aménagement du Chéran
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This is a parent project encompassing the following projects	No

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rhône - Méditerranée River basin Haute-Savoie Subcatchment River name Dadon Area category 100 - 1000 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Western Highlands Dominant land cover Waterbody ID Site Edit site Name Dadon WFD water body codes FRDR11706 WFD (national) typology WFD water body name Pre-project morphology Single channel, Straight Reference morphology Single channel, Sinuous Desired post project morphology Heavily modified water body true National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Quick run-off Dominant substrate Bedrock, Cobble, Gravel River corridor land use Extensive agriculture, Grassland Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 2 - 5 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.90.9 m³/s <br />900 l/s <br /> Average channel gradient category Average channel gradient 0.25 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 1000 m1 km <br />100,000 cm <br /> Project started 2004/05/01 Works started 2004/05/01 Works completed 2009/09/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Water Agency, SMIAC, Councils of Savoie and Haute-Savoie Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Water Agency Stakeholder engagement and communication Water Agency Works and works supervision Water Agency Post-project management and maintenance Water Agency Monitoring Water Agency Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Riparian development Hydromorphology Width & depth variation, Flow velocities, Quantity & dynamics of flow, Channel pattern/planform, Continuity for organisms Biology Fish: Species composition, Fish: Abundance Physico-chemical Other reasons for the project Bank erosion, Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications Implementation of rip rap, Habitat diversification, Implementation of vegetated boxes, Depth variation, Restoration of original bed Floodplain / River corridor Planform / Channel pattern Creation of meanders, Creation of sinuosity Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Width & depth variation Yes Yes Yes Improvement Channel pattern/planform Yes Yes Yes Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Species composition Yes Yes Yes Improvement Fish: Abundance Yes 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 Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information