Case study:Off-Channels Restauration

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Location: 44° 45' 16.68" N, 6° 47' 53.03" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Water quality
Country	France
Main contact forename	François
Main contact surname	Masset
Main contact user ID
Contact organisation	Federation de Peche Hautes Alpes
Contact organisation web site	http://peche-hautes-alpes.com/
Partner organisations
This is a parent project encompassing the following projects

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Project summary

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In the Guil and Durance Basin, side channels and off-channels features within the floodplain provide vital habitat to many juvenile and endemic brown trouts. Besides relatively sheltered rearing habitat, floodplain features provide important low velocity refugia during periods of high flow when fish remaining in the main channels are washed away. these groundwater fed channels can be restored to provide valuable off-channel rearing habitat for trouts when these areas will no longer be created or naturally maintained as a consequence of hydro-modification, development, levee construction, incision or bank armoring that limit flooding and channel migration or dry the off-channels. The key element of these sites is their perennial flow of generally cooler water in summer and warmer water in winter that increases fish survival and growth. This restoration is particularly attractive for the high-energy Guil or Durance streams where flow extremes and channel instability often make it impractical to attempt rehabilitation of the main channel. Off-channel habitat rehabilitation can also be a worthwhile option in the interior, where winter conditions may be severe in the main channel

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Guil, Durance Basin WFD water body codes WFD (national) typology WFD water body name Durance and Guil Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest trout (Salmo trutta), Cottus gobio, white-clawed crayfish (Austropotamobius pallipes), telestes souffia Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Less than 2 m Average bankfull channel width (m) Average bankfull channel depth category Less than 0.5 m Average bankfull channel depth (m) Mean discharge category Less than 0.1 m³/s Mean annual discharge (m3/s) Average channel gradient category Less than 0.001 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 20002,000 m <br />2 km <br />200,000 cm <br /> Project started 2010/02/01 Works started 2011/09/01 Works completed 2012/10/15 Project completed 2013/01/15 Total cost category Less than 1 k€ Total cost (k€) Benefit to cost ratio Funding sources FEDER, Water Agency of Mediterranean Regions, Regional Council, Department-level Council, Higher Fishing Council, Local fishing associations Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Less than 1 k€ Fédération des Hautes Alpes pour la pêche et la protection du milieu aquatique Stakeholder engagement and communication Works and works supervision Fédération des Hautes Alpes pour la pêche et la protection du milieu aquatique Post-project management and maintenance Fédération des Hautes Alpes pour la pêche et la protection du milieu aquatique Monitoring Fédération des Hautes Alpes pour la pêche et la protection du milieu aquatique Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern 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 Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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