Case study:Partial removal of weir on the Sanguèze at Mouzillon

0.00

(0 votes)

To discuss or comment on this case study, please use the discussion page.

Location: 47° 8' 23.21" N, 1° 17' 5.43" W

Edit location

Loading map...

{"format":"googlemaps3","type":"HYBRID","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":50,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"... further results","default":"","import-annotation":false,"width":"auto","height":"400px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":14,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[""],"searchmarkers":"","fullscreen":false,"scrollwheelzoom":false,"showtitle":false,"hidenamespace":true,"template":"Location map popup","userparam":"","activeicon":"","pagelabel":false,"ajaxcoordproperty":"","ajaxquery":"","locations":[{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Partial removal of weir on the Sangu\u00e8ze at Mouzillon\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=France\" title=\"France\"\u003EFrance\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Monitoring\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"Partial removal of weir on the Sangu\u00e8ze at Mouzillon","link":"","lat":47.139781915051,"lon":-1.2848424911499,"icon":"/wiki/images/a/af/Red_marker.png"}]}

Left click to look around in the map, and use the wheel of your mouse to zoom in and out.

Project overview

Edit project overview

Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
Country	France
Main contact forename	Antoine
Main contact surname	Charrier
Main contact user ID
Contact organisation	Institution Interdepartmentale du bassin de la Sèvre Nantaise
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

This case study hasn’t got a picture, you can add one by editing the project overview.

Project summary

Edit project overview to modify the project summary.

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 Sanguèze at Mouzillon one of three pilot schemes was implemented (the other two were on the Thouet at Le Tallud and on the Moine at Cholet). The average water level at the La Motte reservoir near Mouzillon was lowered, through partial removal of the weir downstream. As a result the orginal sinuous water body was partially restored.

Works included allowing self restoration of sinuous channel in the previously impounded stretch.

Monitoring surveys and results

This case study hasn’t got any Monitoring survey and results, you can add some by editing the project overview.

Lessons learnt

This case study hasn’t got any lessons learnt, you can add some by editing the project overview.

Image gallery

Edit Image gallery

The La Motte reservoir, on the Sanguèze river, in 2003, before works.

The La Motte reservoir, in 2004, after works. The original sinous water body was partially restored.

The water body in 2006, two years after works: the river banks were revegeteted.

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 Sevre nantaise Subcatchment River name Sanguèze Area category 1000 - 10000 km² Area (km2) 2356 km²235,600 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 La Motte reservoir in Mouzillon 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 1.54 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 5050 k€ <br />50,000 € <br /> Geolittomer, Université de Nantes (Régis Barraud) 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 Topographic and landscape restoration 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) Additional links and references Edit links and references Link Description http://www.sevre-nantaise.com http://www.valleeduthouet.fr Supplementary Information Edit Supplementary Information