Case study:Partial removal of weir on the Thouet at Le Tallud

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Location: 46° 37' 41.97" N, 0° 17' 47.79" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
Country	France
Main contact forename	Olivier
Main contact surname	Constantin
Main contact user ID
Contact organisation	Syndicat mixte de la vallee du Thouet
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:Adaptive management of hydraulic structures in the Sèvre nantaise and Thouet basins
This is a parent project encompassing the following projects	No

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Project summary

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More than 300 sites in the Sèvre Nantaise and Thouet basins with hydraulic structures underwent participative multicriteria analysis in order to develop programmes to help meet targets defined in the French SAGE process as well as delivering improvements to meet Water Framework Directive objectives. On the Thouet at Le Tallud one of three pilot schemes was implemented (the other two were on the Sanguèze at Mouzillon and on the Moine at Cholet). Through lowering the "Planches" weir the average water level was lowered by approximately 1 m for 300 m upstream and more diversified morphological and hydraulic conditions were obtained.

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Image gallery

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A pool on the Thouet River in 2004, before the lowering of the water level.

A pool on the Thouet River in 2006, after works: the lowering of the water level allows the diversification of flow rates (restoration of a riffle).

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Loire-Bretagne River basin Loire Subcatchment River name Thouet Area category 1000 - 10000 km² Area (km2) 3452 km²345,200 ha <br /> Maximum altitude category 100 - 200 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Western Plains Dominant land cover Waterbody ID Site Edit site Name Le Tallud WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Impounded Reference morphology Sinuous Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate Gravel River corridor land use Extensive agriculture Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient 1.3 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2004/01/01 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Water Agency, Department level councils of the vendee, Loire Atlantique Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Agriculture Hydromorphology Channel pattern/planform, Continuity for organisms, Flow velocities, Width & depth variation Biology Fish: Species composition, Invertebrates, Macrophytes Physico-chemical Other reasons for the project Habitat enhancement Measures Edit Measures Structural measures Bank/bed modifications Weir lowering Floodplain / River corridor Planform / Channel pattern allowing hydromorphological diversification upstream in the previously impounded stretch Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative [[]] Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Yes Yes Awaiting results Invertebrates Yes Yes Yes Awaiting results Macrophytes Yes Yes Yes Awaiting results 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 Public perceptions Yes 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) (in French) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information