Case study:Removal of the Retuerta dam in the Aravalle river:

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Location: 40° 19' 33.13" N, 5° 35' 6.22" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydropower, Hydromorphology
Country	Spain
Main contact forename	Rosa
Main contact surname	Huertas
Main contact user ID
Contact organisation	Confederación Hidrográfica del Duero
Contact organisation web site
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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 Ministry of Agriculture, Food and Environment launched in 2007 the National Strategy for River Restoration to, in keeping with the Water Framework Directive, achieve a good ecological status of rivers. One of the main lines of action is the demolition of transversal obstacles that are in a state of abandonment and have a great impact on the longitudinal connectivity of rivers. In the Duero River basin, more than 80 obstacles have been demolished in recent years. During the months of February and March of 2013, the works to demolish the Retuerta Dam, on the Aravalle river, located in the municipality of Umbrías (province of Ávila) took place. The dam was approximately 14 metres in height and 55 metres in length, making it the highest dam demolished to date. The removal of this dam was contemplated as a compensation measure in an Environmental Impact Statement, with the purpose of recovering the longitudinal connectivity of the Aravalle River in this stretch, which constitutes a rich fluvial ecosystem, torrential in nature, and with abundant ichthyofauna. In fact, the Aravalle River is one of the most relevant watercourses for sustaining fish populations within the Tormes River system. There has also been work related to monitoring the mobilization of sediments and the recovery of the fluvial ecosystem, as well as public information and participation seminars.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology 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 River corridor land use 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) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Dam 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 links and references Edit links and references Link Description http://www.chduero.es/Inicio/Publicaciones/DVDsyAudiovisuales/tabid/586/Default.aspx Project video (English and Spanish versions available) Supplementary Information Edit Supplementary Information