Case study:The Manzanares River Restoration: Demolition of an obsolete dam and riverine ecosystem rehabilitation

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Location: 40° 44' 29.70" N, 3° 53' 21.75" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology
Country	Spain
Main contact forename	CHTajo
Main contact surname	CHTajo
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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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During the decade of the 40s, a small dam (9 meters high, 23 meters width) was built in the Manzanares River, in a site placed inside the Regional Park, in order to supply water to the village –Manzanares del Real- located few kilometers downstream. Year by year the dam has accumulated such a big quantity of sediments coming from the granite banks and slopes that at the end of the century it was completely full of sand, in such a way that it became useless. The main target was to give back to the river the natural features it had before the dam construction and to recover the longitudinal and transversal continuity. The river basin authority, that belongs to the Spanish Ministry of Environment -Confederación Hidrográfica del Tajo- in collaboration with other authorities (the local Council and the Madrid Autonomous Community), stated as an achievement this dam removal, in order to solve the problems the structure was inducing in the riverine ecosystem. The project has a total budget of 450.000€.

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Image gallery

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Aerial view of the restoration area

Dam before demolition

Removal of debris. Residues stacked by machinery were transported by helicopter for its withdrawal

Small plantations in the environment

Channel after the demolition of the dam in September 2007

Manzanares River in June 2008

Profile of the cross and longitudinal section

Sediments accumulated in pools

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.Tajo River basin Tajo Subcatchment River name Manzanares Area category Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 980 m0.98 km <br />98,000 cm <br /> Dominant geology Siliceous Ecoregion Ibero-Macaronesian Dominant land cover Woodland Waterbody ID Site Edit site Name Paraje del Tranco, Manzanares del Real 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 UNESCO Biosphere Reserve, Regional Park Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use Woodland 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 2008/01/01 Works started Works completed 2008/01/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) 450 k€450,000 € <br /> Benefit to cost ratio Funding sources Department of Environment of the Community of Madrid, C.H.Tajo 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.Tajo Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Continuity for organisms, Continuity of sediment transport, Channel pattern/planform, Structure & condition of riparian zones Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank stabilization, Dam removal Floodplain / River corridor Riparian tree planting 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 Channel pattern/planform Yes Yes Yes Yes Improvement Structure & condition of riparian zones Yes Yes Yes Improvement 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 Supplementary Information Edit Supplementary Information