Case study:Weir demolition in river Nansa, Cantabria

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Location: 43° 19' 36", -4° 29' 11"
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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
Country Spain
Main contact forename The North Hydrographic Confederation
Main contact surname The North Hydrographic Confederation
Main contact user ID
Contact organisation Oficina regional de Comisaría de Aguas y Dirección Técnica, C.H. Cantábrico
Contact organisation web site
Partner organisations
Parent multi-site project
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encompassing the following
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Project summary

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The weir of Camijanes was in obsolete, preventing proper connectivity of the river. The hydroelectric reservoirs are located upstream in the reservoir or the Cohilla and the dam Palombera, although there are many scattered water intakes that feed the river through mini-channels. Many of the abstractions are illegal. The main objective of the project is recovering natural local continuity for the river through the removal of the weir of Camijares (90x5x3m³). This project counts with the support of national institutions. The financing comes from the North Hydrographic Confederation and the Ministry of Environment. The total budget for carry out the rehabilitation is 93.779,55€.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Aerial view of Nansa River in Camijares
Nansa Basin area map with the main cross barriers
Dam of Camijares before works
Nansa River after completion of works
Palombrera dam
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Catchment and subcatchment

Catchment

River basin district C.H. Cantábrico
River basin Nansa

Subcatchment

River name Nansa
Area category 100 - 1000 km²
Area (km2) 429 km²
42,900 ha
Maximum altitude category Less than 100 m
Maximum altitude (m) 45 m
0.045 km
4,500 cm
Dominant geology Calcareous
Ecoregion Ibero-Macaronesian
Dominant land cover Extensive agriculture
Waterbody ID



Site

Name Azud de Camijares
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 Intensive agriculture
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) 46 m
0.046 km
4,600 cm
Project started 2010/01/01
Works started
Works completed 2010/01/01
Project completed
Total cost category
Total cost (k€) 93 k€
93,000 €
Benefit to cost ratio
Funding sources Plan E

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. Cantábrico
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Weir removal
Floodplain / River corridor
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.chcantabrico.es/index.php?option=com content&view=article&id=575:demolicion-de-azud-de-camijanes-en-el-rio-nansa
http://www.diagonalperiodico.net/cantabria/spip.php?article292 Press release
http://recuperaciondelrionansa.blogspot.com.es/ Local blog

Supplementary Information

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