Case study:Fluvial longitudinal continuity recovery in river Aguanaz, Cantabria, Spain

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Location: 43° 23' 6", -3° 41' 34"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology
Country Spain
Main contact forename The North Hydrographic Confederation
Main contact surname The North Hydrographic Confederation
Main contact user ID
Contact organisation MARM
Contact organisation web site http://www.magrama.gob.es/es/
Partner organisations
Parent multi-site project
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encompassing the following
projects
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Project picture

Project summary

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The River Aguanaz is located in the North of Spain, in Cantabria. It flows to the Cantabric Sea. The final reach is affected by several impacts, especially for fish community. The existence of barriers in the channel (weirs) affect fish communities, as it modifies their mobility along the river, interrupting the longitudinal continuity. Several of these structures were built for water use in flour mills. The main problematic with this river is that has little longitudinal continuity, which directly affects the fish community. The main objectives of the project are: Recover continuity in Aguanaz channel, removing four existing barriers; and guaranteeing the survival of fish species. This project counts with the support of national institutions. The financing comes from the Plan E initiative and the Ministry of Environment. The total budget for carry out the rehabilitation is 65.362,81€.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Aerial view of Aguanaz River between Hoznayo and Entrambasaguas
Aguanaz River
Santa Marina village
Transversal barrier in Aguanaz River
Beginning of demolition works in November 2009
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Catchment and subcatchment

Catchment

River basin district C.H. Cantábrico
River basin Miera

Subcatchment

River name Aguanaz
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m) 47 m
0.047 km
4,700 cm
Dominant geology Calcareous
Ecoregion Ibero-Macaronesian
Dominant land cover Extensive agriculture
Waterbody ID



Site

Name Aguanaz
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 true
National/international site designation
Local/regional site designations
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)
Project started 2009/11/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€) 65 k€
65,000 €
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 C.H. Cantábrico
Post-project management and maintenance
Monitoring



Reasons for river restoration

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


Measures

Structural measures
Bank/bed modifications Weir removal
Floodplain / River corridor
Planform / Channel pattern
Other Improvement of local paths and river banks
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=340:la-chc-invierte-medio-millon-de-euros-en-trabajos-de-demolicion-de-azudes-con-el-objeto-de-mejorar-el-estado-ecologico-de-los-rios-en-cantabria&catid=31:noticias&Itemid=54&lang=es Project information
http://www.chcantabrico.es/images/pdf/prensa/noticias/notaprensa chc20091104 demolicion azud aguanaz.pdf Press release

Supplementary Information

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