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

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Location: 40° 39' 47", -2° 1' 33"
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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
Contact organisation web site
Partner organisations
Parent multi-site project
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Project summary

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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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Image gallery


Map of the restoration area
Picture before works
Picture before works
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Catchment and 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 m
1.1 km
110,000 cm
Dominant geology
Ecoregion Ibero-Macaronesian
Dominant land cover Extensive agriculture, Urban
Waterbody ID



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

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€) 875 k€
875,000 €
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

Mitigation of a pressure Aggregate/mineral extraction
Hydromorphology Continuity of sediment transport
Biology
Physico-chemical
Other reasons for the project


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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

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Before measures After measures Qualitative Quantitative


Monitoring documents



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Supplementary Information

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