Case study:Agreed definition of mobility area for the Adour

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Project overview

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Status Complete
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
This is a parent project
encompassing the following
projects 		No
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Project summary

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Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(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

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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

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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

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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

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Structural measures
Bank/bed modifications Management of alluvial structures
Floodplain / River corridor Definition of the corridor, Restoration of riparian forest
Planform / Channel pattern Re-opening of branch, Limiting the establishment of new risk areas, Modifying or moving existing sites at risk
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other Consultation


Monitoring

Hydromorphological quality elements

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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

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

Physico-chemical quality elements

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


Monitoring documents

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Additional documents and videos

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Additional links and references

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Link Description

Supplementary Information

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