Case study:Weir demolition in river Nansa, Cantabria

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Location: 43° 19' 35.75" N, 4° 29' 10.86" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity
Country	Spain
Main contact forename	The North Hydrographic Confederation
Main contact surname	The North Hydrographic Confederation
Main contact user ID
Contact organisation	Oficina regional de Comisaría de Aguas y Dirección Técnica, C.H. Cantábrico
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 weir of Camijanes was in obsolete, preventing proper connectivity of the river. The hydroelectric reservoirs are located upstream in the reservoir or the Cohilla and the dam Palombera, although there are many scattered water intakes that feed the river through mini-channels. Many of the abstractions are illegal. The main objective of the project is recovering natural local continuity for the river through the removal of the weir of Camijares (90x5x3m³). This project counts with the support of national institutions. The financing comes from the North Hydrographic Confederation and the Ministry of Environment. The total budget for carry out the rehabilitation is 93.779,55€.

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Image gallery

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Aerial view of Nansa River in Camijares

Nansa Basin area map with the main cross barriers

Dam of Camijares before works

Nansa River after completion of works

Palombrera dam

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district C.H. Cantábrico River basin Nansa Subcatchment River name Nansa Area category 100 - 1000 km² Area (km2) 429 km²42,900 ha <br /> Maximum altitude category Less than 100 m Maximum altitude (m) 45 m0.045 km <br />4,500 cm <br /> Dominant geology Calcareous Ecoregion Ibero-Macaronesian Dominant land cover Extensive agriculture Waterbody ID Site Edit site Name Azud de Camijares WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Sinuous Reference morphology Sinuous Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Site of Community Importance Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use Intensive agriculture Average bankfull channel width category 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 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 46 m0.046 km <br />4,600 cm <br /> Project started 2010/01/01 Works started Works completed 2010/01/01 Project completed Total cost category Total cost (k€) 93 k€93,000 € <br /> Benefit to cost ratio Funding sources Plan E 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 C.H. Cantábrico Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal 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 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 Additional documentation (in Spanish) Additional links and references Edit links and references Link Description http://www.chcantabrico.es/index.php?option=com content&view=article&id=575:demolicion-de-azud-de-camijanes-en-el-rio-nansa http://www.diagonalperiodico.net/cantabria/spip.php?article292 Press release http://recuperaciondelrionansa.blogspot.com.es/ Local blog Supplementary Information Edit Supplementary Information