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
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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In the Guil 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 stream 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

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Site

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Name	Guil Basin
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	No
National/international site designation
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Protected species present	No
Invasive species present	No
Species of interest	trout (Salmo trutta), Cottus gobio
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
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Project background

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Reasons for river restoration

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Measures

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Monitoring

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quality elements

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Supplementary Information

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