Case study:Weir demolition in river Nansa, Cantabria
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Location: 43° 19' 35.75" N, 4° 29' 10.86" W
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Project overview
| Status | Complete |
|---|---|
| Project web site | |
| Themes | |
| 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 | |
| This is a parent project encompassing the following projects |
No |
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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 (90x5x3).
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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Catchment and subcatchment
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Catchment
| River basin district | C.H. Cantábrico |
|---|---|
| River basin | Nansa |
Subcatchment
| River name | Nansa |
|---|---|
| Area category | 100 - 1000 km² |
| Area (km2) | 429 km²42,900 ha <br /> |
| Maximum altitude category | Less than 100 m |
| Maximum altitude (m) | 45 m0.045 km <br />4,500 cm <br /> |
| 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 m0.046 km <br />4,600 cm <br /> |
|---|---|
| Project started | 2010/01/01 |
| Works started | |
| Works completed | 2010/01/01 |
| Project completed | |
| Total cost category | |
| Total cost (k€) | 93 k€93,000 € <br /> |
| 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 | Removal of small weir 90 x 5 x 3 m³ |
| Floodplain / River corridor | |
| Planform / Channel pattern | |
| Other | |
Non-structural measures
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| 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 | ||
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| Before measures | After measures | Qualitative | Quantitative | |||
Physico-chemical quality elements
| Element | When monitored | Type of monitoring | Control site used | Result | ||
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Any other monitoring, e.g. social, economic
| Element | When monitored | Type of monitoring | Control site used | Result | ||
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| Before measures | After measures | Qualitative | Quantitative | |||
Monitoring documents
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