Case study:Improved longitudinal continuity of the Lozoya River, upstream the Pinilla dam (Madrid)

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Location: 40° 54' 59", -3° 49' 51"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Flood risk management, Habitat and biodiversity
Country Spain
Main contact forename CHTajo
Main contact surname CHTajo
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
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Project summary

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The presence of a transverse barrier (concrete weir) prevents longitudinal connectivity despite the presence of a fish scale (inoperative). The existence of two side walls that extend upstream of the weir is an impediment to lateral connectivity between the river and floodplains. This is an unregulated river with little human influence (livestock). The main action consists of the removal of a small cross weir with a non-operational fish scale and two side walls that extend upstream of the weir. It was requested by the association of fishermen in Alameda and Pinilla. The project has a total budget of 369.399€ and is executed by the Tajo River Basin.

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Image gallery


Aerial view of the restoration area
Map of the restoration area
Embankments of the dam before disposal
Weir before works
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Catchment and subcatchment

Catchment

River basin district C.H.Tajo
River basin Tajo

Subcatchment

River name Lozoya
Area category
Area (km2)
Maximum altitude category 1000 - 2000 m
Maximum altitude (m) 1093 m
1.093 km
109,300 cm
Dominant geology Siliceous
Ecoregion Ibero-Macaronesian
Dominant land cover Woodland
Waterbody ID



Site

Name Azud del Lozoya antes de la presa de Pinilla
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 Site of Community Importance
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

Reach length directly affected (m)
Project started 2009/01/01
Works started
Works completed 2009/01/01
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 369 k€
369,000 €
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 C.H.Tajo
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology Continuity for organisms, Continuity of sediment transport, Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Lowering of lateral slopes, Weir removal, Removal of sediment
Floodplain / River corridor Riparian planting, Conditioning access
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
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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Additional links and references

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Supplementary Information

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