Case study:Fluvial restoration in River Carrión

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Location: 42° 39' 56", -4° 49' 22"
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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
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Project picture

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).

Monitoring surveys and results

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Lessons learnt

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Image gallery


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
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Catchment and 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

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

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

Mitigation of a pressure
Hydromorphology Structure & condition of riparian zones
Biology Fish: Abundance
Physico-chemical
Other reasons for the project


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

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

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

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

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Supplementary Information

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