Case study:Improving the ecological status of the Black River and tributaries (Zamora)

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Location: 42° 2' 50", -6° 16' 15"
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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 Ignacio
Main contact surname Rodríguez Muñoz
Main contact user ID
Contact organisation C.H.Duero
Contact organisation web site http://www.magrama.gob.es
Partner organisations
Parent multi-site project
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encompassing the following
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Project summary

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The Negro river drains the area located at the south of Sierra de la Cabrera, of siliceous substrate, in Zamora Province. The area is also placed in protected areas (SCI and ZEPA). The principal objective of this initiative is to recover trout populations and the naiad Margaritifera margaritifera, which is in serious danger of extinction. The main threat to these species is the presence of weirs that make difficult or impossible the migration of the trouts upstream, which are the propagation vector of the naiads, affecting their reproduction. The project aimed to recover aquatic populations and improve instream habitats; improve the composition and structure of the riparian vegetation and ameliorate longitudinal connectivity of the fluvial system The ecological improvement of the Negro river is part of a national river restoration program, Estrategia Nacional de Restauración de Ríos, developed by the Ministry of Environment. The Confederación Hidrográfica del Duero is the organism which has implemented this project, as others of the Duero basin. The project has a total budget of 3.245.382€.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Map of the restoration area
Aerial view of Negro River
Negro River
Weir in Negro River
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Catchment and subcatchment

Catchment

River basin district C.H.Duero
River basin Duero

Subcatchment

River name Negro
Area category
Area (km2)
Maximum altitude category 500 - 1000 m
Maximum altitude (m) 950 m
0.95 km
95,000 cm
Dominant geology Siliceous
Ecoregion Ibero-Macaronesian
Dominant land cover Woodland, Extensive agriculture
Waterbody ID



Site

Name Ríos Negro, Fontirín, Sapo y arroyos de Carballades y Trepollar
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 EU - Special Protected Area
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
Project completed
Total cost category 1000 - 5000 k€
Total cost (k€) 3245 k€
3,245,000 €
Benefit to cost ratio
Funding sources MARM

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
Hydromorphology Continuity for organisms, Channel pattern/planform, Structure & condition of riparian zones
Biology Invertebrates: Diversity
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Revetments with local species, Creation of fish ladders
Floodplain / River corridor Develop riparian forest
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

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


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://www.magrama.gob.es/ministerio/pags/Biblioteca/Revistas/pdf SAU%2FSAU 2009 1 6 7.pdf SAUCE paper

Supplementary Information

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