Case study:Removal of the Fatou dam on the Beaume river

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Location: 44° 56' 59.17" N, 3° 54' 57.60" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - agriculture
Country	France
Main contact forename	Olivier
Main contact surname	Collon
Main contact user ID
Contact organisation	Etablissement public Loire
Contact organisation web site	http://www.eptb-loire.fr/
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 Beaume river, a tributary of Loire river, is 10 kilometers long; 2,7 Km before the confluence with the Loire, the river forms a natural waterfall 27 meters high. The ecological quality of rivers is quite good. In 1907, a 6.10 meters height dam is built, for the hydroelectric power plant of Fatou. The utilization of this plant stops in the sixties. The dam blocks the ecological continuity. Approximately 6,000 m3 of sediment has accumulated behind the dam. During 1985 the dam has become public property. For security reasons related to poor condition of the structure, it is decided to erase it. The work consists on the completely removal of the dam and factory building.

Monitoring surveys and results

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After works, the natural water line is restored and the vegetation along the Baume river is naturally quickly restored. At present, an evaluation is not possible due to the limited data availability. However, the initial results are very encouraging.

Lessons learnt

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Image gallery

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The Fatou dam in April 2004.

The Fatou dam.

The reservoir after drainage in July 2007.

The Baume river restoring his riverbed, in July 2007.

The Baume in the old impoundment, in December 2008.

The Baume river in the old impoundment of the Fatou dam, in summer 2008.

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 Auvergne Subcatchment River name Fatou Beaume Area category 1000 - 10000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Western Plains Dominant land cover Extensive agriculture, Woodland Waterbody ID Site Edit site Name Fatou WFD water body codes FRGR1677 WFD (national) typology WFD water body name Pre-project morphology Single channel, Impounded Reference morphology Single channel, 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 River corridor land use Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.230.23 m³/s <br />230 l/s <br /> Average channel gradient category Average channel gradient 0.37 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started 2007/07/01 Works completed 2007/10/01 Project completed Total cost category Total cost (k€) 204204 k€ <br />204,000 € <br /> Benefit to cost ratio Funding sources Etablissement public de Loire, Etat, Water Agency, European Union Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Etablissement public de Loire Stakeholder engagement and communication Works and works supervision 204204 k€ <br />204,000 € <br /> Etablissement public de Loire Post-project management and maintenance Etablissement public de Loire Monitoring Etablissement public de Loire Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower Hydromorphology Continuity for organisms, Continuity of sediment transport, Quantity & dynamics of flow, Channel pattern/planform Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Dam removal, Dredging of sediment (mud), Removal of sediment Floodplain / River corridor Planform / Channel pattern 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 No Yes No Awaiting results Fish: Species composition Yes Yes No No No 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 [[]] Yes Yes Yes No No 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) (in French) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information