Case study:Fluvial restoration in River Carrión

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Location: 42° 39' 56.34" N, 4° 49' 22.17" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology
Country	Spain
Main contact forename	AEMS
Main contact surname	AEMS
Main contact user ID
Contact organisation	AEMS - Ríos con Vida
Contact organisation web site	http://riosconvida.es/
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 Carrión river restoration located in Fresno del Río and Pino del Río (Palencia) covered a river reach with maximum flows between 218 and 527 m3/s, which is regulated by Camporredondo and Compuerto dams. The minimum flow is about 2 m3/s, set by the Confederación Hidrográfica del Duero. The concern about this reach was due to shore erosion and the lack of refuge for trout. In order to mitigate the impact of flow regulation and to improve the aquatic habitat for fish, several actions took place both instream and at the riparian zone: Boulders (limestone) were placed in the riverbed for improve the instream structure and habitat diversity; reforestation of the margins with four live fences; reforestation with single stakes; plantation of 170 stakes (75 % Salix fragilis and 25% of Salix purpurea and Salix atrocinerea); construction of a wing deflector consisting of stones, logs, and branch cuttings of willow and aquatic plants for its stabilization; plantation of branch cuttings and stakes of willow at stable margins to give shading and shelter for the trouts. The effectiveness of the project was monitored by the Junta de Castilla y León almost until 1999. The evolution of trout population was measured with periodic samplings (electrofishing).

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Image gallery

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Aerial view of Carrion River between Pino del Río and Fresno del Río

Aerial view of Carrion River between Pino del Río and Fresno del Río in 2010

Carrión River before works

Carrion River during works, in 1997

Carrion River after works, in 1998

Carrion River after works, in 1999

Riverbanks before works, in 1994

Riverbanks after works, in 1998

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district C.H.Duero River basin Pisuerga Subcatchment River name Carrión Area category 1000 - 10000 km² Area (km2) Maximum altitude category more than 2000 m Maximum altitude (m) Dominant geology Calcareous Ecoregion Ibero-Macaronesian Dominant land cover Plantation forestry, Extensive agriculture Waterbody ID Site Edit site Name Entre Pino del Río y Fresno del Río 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 Protected species present Invasive species present Species of interest Dominant hydrology Quick run-off Dominant substrate River corridor land use Plantation forestry 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 Edit project background Reach length directly affected (m) Project started 1996/01/01 Works started Works completed 1996/11/01 Project completed Total cost category Total cost (k€) 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 Confederación Hidrográfica del Duero Post-project management and maintenance Monitoring Junta de Castilla y León (Local Government) Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Structure & condition of riparian zones Biology Fish: Abundance Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications New bioengineering elements in order to stabilize slope banks, Deflectors, Creation of wooden deflectors, Creation of gravel deflectors, Bed load addition, Bank reprofiling Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Structure & condition of riparian zones Yes Yes Yes Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Yes Yes Improvement Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional documentation (in Spanish) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information