Case study:Restoration in river Tajo and tributaries after kaolin spillage

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Location: 40° 39' 46.55" N, 2° 1' 33.41" 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, Hydromorphology, Water quality
Country	Spain
Main contact forename	CHTajo
Main contact surname	CHTajo
Main contact user ID
Contact organisation	Confederación Hidrográfica del Tajo
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Parent multi-site project
This is a parent project encompassing the following projects	No

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This project is part of the National strategy for River Restoration, an initiative of the Ministry of Environment, and implemented at the Tajo basin by the Confederación Hidrográfica del Tajo. The zone of actuation is included in the CSI ES4240016, ZEPA ES0000092, "Parque Natural del Alto Tajo" and peripheral protection area of "Prados Húmedos de Torremocha del Pinar". The open air mining releases a great quantity of sediments which are incorporated into the Tajo River and its tributaries at the area between Peñalén, Poveda de la Sierra and Taravilla. Despite the construction of pools for collect the runoff and the sediment scours from the mining exploitations, some turbidity can be observed. The result is the alteration of the water quality and the availability of instream habitats. The main objective of the project is to improve the availability of habitats and recovery the fish populations. The principal measures are directed to improve the quality of the water, improve the structure and substrate of the channel and recover the longitudinal connectivity of the river. The installation of a fish pass at the Salto de la Poveda would allow the migration of the fish upstream. The establishment of buffer strips contributes to ameliorate the quantity of sediments carried with the runoff. This way, the decrease of turbidity may improve the quality of aquatic habitats and the morphology of the channel. Anyway, at the monitoring stage it has to be proved that the scope of the vegetal filters is enough to mitigate the impact of the kaolin mining.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Tajo River basin Tajo Subcatchment River name Tajo Area category Area (km2) Maximum altitude category 1000 - 2000 m Maximum altitude (m) 1100 m1.1 km <br />110,000 cm <br /> Dominant geology Ecoregion Ibero-Macaronesian Dominant land cover Extensive agriculture, Urban Waterbody ID Site Edit site Name Parque Natural del Alto Tajo WFD water body codes 12042 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 EU - Special Protected Area Local/regional site designations Area of Special Conservation Interest Protected species present Invasive species present Species of interest Dominant hydrology Quick run-off, Artificially regulated Dominant substrate River corridor land use Woodland, Urban 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€) 875 k€875,000 € <br /> 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 Aggregate/mineral extraction Hydromorphology Continuity of sediment transport Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Installation of bioengineering elements, Creation of fish passes Floodplain / River corridor Removal of sediments from the mines, Vegetation management Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) New paths near the river, Information panels for people 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 Supplementary Information Edit Supplementary Information