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

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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
Local/regional site designations
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
Average channel gradient
Average unit stream power (W/m2)

Project background

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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
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
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Measures

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Floodplain / River corridor
Planform / Channel pattern
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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Additional links and references

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Supplementary Information

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