Case study:Vallacuera Ravine. Removal of a dyke

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Location: 42° 20' 41.09" N, 1° 47' 17.82" W

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Project overview

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Status	Complete
Project web site
Themes
Country	Spain
Main contact forename	Fernando
Main contact surname	Mendoza
Main contact user ID
Contact organisation	Gestión Ambiental Viveros y Repoblaciones de Navarra, S.A.
Contact organisation web site	http://www.gavrn.com/
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 dike built in the 80’s after the canalization works carried out in Arga River was removed to recover the natural floodplain in one of the tributaries’ confluence: Vallacuera stream. The main objective of this project is to restore the river Arga natural floodplain by removing the dyke and increasing the fluvial territory. There are other secondary objectives: to increase the quality of habitat in Community Interest Areas, with special attention to European mink (Mustela lutreola); creating new habitats for otter (Lutra lutra) and European turtle (Emys orbicularis); quality improvement of habitats 92A0 (willow and black poplar plantation) and 92D0 (tamarisk plantation); spatial planning for cattle. The project has a total budget of 138.840,25€ and is financed by GERVE-LIFE project, INTERREG GIRE project, "Gestión Ambiental, Viveros y Repoblaciones de Navarra, S.A." and Government of Navarre.

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.Ebro
River basin	Arga

Subcatchment

River name	Arga
Area category
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)	286 m0.286 km <br />28,600 cm <br />
Dominant geology
Ecoregion	Ibero-Macaronesian
Dominant land cover
Waterbody ID

Site

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Name	Barranco de Vallacuera
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Embanked
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
Dominant substrate	Silt, Clay
River corridor land use
Average bankfull channel width category	more than 50 m
Average bankfull channel width (m)	120120 m <br />0.12 km <br />12,000 cm <br />
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	33 m³/s <br />3,000 l/s <br />
Average channel gradient category
Average channel gradient	0.003
Average unit stream power (W/m2)	0.7355250.736 W/m² <br />

Project background

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Reach length directly affected (m)	1000 m1 km <br />100,000 cm <br />
Project started	2006/09/01
Works started
Works completed	2007/04/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	138 k€138,000 € <br />
Benefit to cost ratio
Funding sources	Government of Navarra, Gestión Ambiental, Viveros y Repoblaciones de Navarra S.A., LIFE GERVE, INTERREG

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			Gestión Ambiental, Viveros y Repoblaciones de Navarra S.A.
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure	Flood defence
Hydromorphology	Channel pattern/planform, Width & depth variation
Biology
Physico-chemical
Other reasons for the project	Flood risk management

Measures

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Structural measures
Bank/bed modifications	New bioengineering elements in order to stabilize slope banks
Floodplain / River corridor	Removal of exotic plants, Construction new habitats for otter (Lutra lutra) and European turtle (Emys orbicularis), Conditioning access to properties and pedestrian paths
Planform / Channel pattern	Removal of a dyke
Other
Non-structural measures
Management interventions	Reduce the risk of flooding downstream
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
Channel pattern/planform	Yes					Awaiting results
Width & depth variation	Yes					Awaiting results

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

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
Flood defense	Yes	Yes	Yes			Improvement

Monitoring documents

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Image gallery

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Aerial view of Vallacuera ravine

Mouth of the ravine before the actuation

Artificial pond in the area

Additional documents and videos

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Additional information (in Spanish)

Additional links and references

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Link	Description

Supplementary Information

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