Case study:Off-Channels Restauration

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Location: 44° 45' 17", 6° 47' 53"
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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
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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



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

Reach length directly affected (m) 2000
2,000 m
2 km
200,000 cm
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

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

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Before measures After measures Qualitative Quantitative


Monitoring documents



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Supplementary Information

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