Case study:Agreed definition of mobility area for the Adour

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Location: 43° 39' 8.51" N, 0° 0' 51.13" W

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Project overview

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Status	In progress
Project web site
Themes
Country	France
Main contact forename	Fréderic
Main contact surname	Ré
Main contact user ID
Contact organisation	Institution Adour
Contact organisation web site
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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The Adour is an highly mobile, braided piedmont watercourse and constitutes one of the primary resources for alluvial materials in the Adour-Garonne basin. From the 1960s, large amounts of aggregates were extracted from both its main channel and associated floodplain. These activities caused a significant incision of the main channel, reducing the frequency of flooding into the floodplain, lowering the ground water table and cutting off ancient meanders, etc. Thus erosion of the banks occurred, which prompted the managing authorities to stabilise its cross-sectional and longitudinal profile: major embankments, weirs and protective structures for banks (covering 26% of banks) were subsequently constructed on the Adour. In order to put a stop to isolated responses to demands for riverbank consolidation without the implementation of a global approach, the Institution Adour and the two local associations conducted a joint study of how to design an integrated, acceptable and sustainable management programme for the Adour’s mobility area. The consultation with stakeholders in the area led to the definition of a permissible mobility area covering 1,744 hectares.

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The Adour at Izotges (Gers).

Restoration of the three hectares of floodplain by moving back embankments, representing an additional storage area for 50,000 m³ of floodwater.

The Adour at Jû-Belloc (Gers): watercourse with a mobile bed.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Hautes-Pyrénées et Ger River basin Adour - Garonne Subcatchment River name L'Adour Area category more than 10000 km² Area (km2) 17000 km²1,700,000 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Plains Dominant land cover Intensive agriculture Waterbody ID Site Edit site Name Hautes-Pyrénées et Ger WFD water body codes FRFR327C WFD (national) typology WFD water body name Pre-project morphology Braided, Entrenched, Embanked Reference morphology Braided 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 Dominant substrate Gravel River corridor land use Intensive agriculture, Urban Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) 2020 m <br />0.02 km <br />2,000 cm <br /> Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 3535 m³/s <br />35,000 l/s <br /> Average channel gradient category Average channel gradient 0.002 Average unit stream power (W/m2) 34.324534.325 W/m² <br /> Project background Edit project background Reach length directly affected (m) 44000 m44 km <br />4,400,000 cm <br /> Project started 2005/01/01 Works started 2008/01/01 Works completed 2018/01/01 Project completed Total cost category 1000 - 5000 k€ Total cost (k€) 3733 k€3,733,000 € <br /> Benefit to cost ratio Funding sources Water Agency, Institution Adour, Regional Council, French State Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 100 - 500 k€ 130 k€130,000 € <br /> Stakeholder engagement and communication 50 - 100 k€ 55 k€55,000 € <br /> Works and works supervision 1000 - 5000 k€ 2580 k€2,580,000 € <br /> Water Agency Post-project management and maintenance Monitoring 100 - 500 k€ 130 k€130,000 € <br /> Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood defence, Abstraction, Aggregate/mineral extraction Hydromorphology Width & depth variation, Flow velocities, Structure & condition of riparian zones Biology Physico-chemical Other reasons for the project Flood risk management, Stop riverbed incision and groundwater table lowering Measures Edit Measures Structural measures Bank/bed modifications Removal/retreat of bank protection Floodplain / River corridor Restoration of riparian forest Planform / Channel pattern Other Non-structural measures Management interventions Definition of erodble corridor Social measures (incl. engagement) Other Consultation Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Channel pattern/planform Yes 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 Case study description by ONEMA (French National Agency for Water and Aquatic Environments) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information