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
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).

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.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

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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

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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

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

Measures

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Structural measures
Bank/bed modifications	New bioengineering elements in order to stabilize slope banks, Placement of stones on the riverbed, Reshaping of banks, Construction of a deflector consisting of stones, logs, and branch cuttings of willow and aquatic plants for its stabilization
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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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

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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

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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

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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