Case study:Vallacuera Ravine. Removal of a dyke

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Location: 42° 20' 41.09" N, 1° 47' 17.82" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Land use management - agriculture
Country	Spain
Main contact forename	Fernando
Main contact surname	Mendoza
Main contact user ID
Contact organisation	Gestión Ambiental Viveros y Repoblaciones de Navarra, S.A.
Contact organisation web site	http://www.gavrn.com/
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 dike built in the 80’s after the canalization works carried out in Arga River was removed to recover the natural floodplain in one of the tributaries’ confluence: Vallacuera stream. The main objective of this project is to restore the river Arga natural floodplain by removing the dyke and increasing the fluvial territory. There are other secondary objectives: to increase the quality of habitat in Community Interest Areas, with special attention to European mink (Mustela lutreola); creating new habitats for otter (Lutra lutra) and European turtle (Emys orbicularis); quality improvement of habitats 92A0 (willow and black poplar plantation) and 92D0 (tamarisk plantation); spatial planning for cattle. The project has a total budget of 138.840,25€ and is financed by GERVE-LIFE project, INTERREG GIRE project, "Gestión Ambiental, Viveros y Repoblaciones de Navarra, S.A." and Government of Navarre.

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Aerial view of Vallacuera ravine

Mouth of the ravine before the actuation

Artificial pond in the area

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.Ebro River basin Arga Subcatchment River name Arga Area category Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 286 m0.286 km <br />28,600 cm <br /> Dominant geology Ecoregion Ibero-Macaronesian Dominant land cover Waterbody ID Site Edit site Name Barranco de Vallacuera WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Embanked Reference morphology Sinuous Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate Silt, Clay River corridor land use Average bankfull channel width category more than 50 m Average bankfull channel width (m) 120120 m <br />0.12 km <br />12,000 cm <br /> Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 33 m³/s <br />3,000 l/s <br /> Average channel gradient category Average channel gradient 0.003 Average unit stream power (W/m2) 0.7355250.736 W/m² <br /> Project background Edit project background Reach length directly affected (m) 1000 m1 km <br />100,000 cm <br /> Project started 2006/09/01 Works started Works completed 2007/04/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) 138 k€138,000 € <br /> Benefit to cost ratio Funding sources Government of Navarra, Gestión Ambiental, Viveros y Repoblaciones de Navarra S.A., LIFE GERVE, INTERREG 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 Gestión Ambiental, Viveros y Repoblaciones de Navarra S.A. Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood defence Hydromorphology Channel pattern/planform, Width & depth variation Biology Physico-chemical Other reasons for the project Flood risk management Measures Edit Measures Structural measures Bank/bed modifications New bioengineering elements in order to stabilize slope banks Floodplain / River corridor Removal of exotic plants, Construction new habitats for otter (Lutra lutra) and European turtle (Emys orbicularis), Conditioning access to properties and pedestrian paths Planform / Channel pattern Removal of a dyke Other Non-structural measures Management interventions Reduce the risk of flooding downstream 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 Channel pattern/planform Yes Awaiting results Width & depth variation Yes Awaiting results 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 Flood defense Yes Yes Yes Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional information (in Spanish) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information