Case study:Restoration project of the degraded area of the Molí source environment and improvement of river areas and adjacent riparian formations

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Location: 42° 11' 57.05" N, 2° 42' 3.00" E

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Project overview

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Status	Complete
Project web site
Themes
Country	Spain
Main contact forename	Naturalea S.L.
Main contact surname	Naturalea S.L.
Main contact user ID
Contact organisation	Naturalea S.L.
Contact organisation web site
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 area to be restored has been divided into two sections. In the first, there is a medieval wall damaged by time and erosion visible on the slope that separates the river bed. In the second, we see the effects of erosion caused by a channel: nearly vertical slope with landslides in some areas. The main actions in this project are: the use of new bioengineering elements in order to stabilize slope banks and to prevent erosion in town wall; replaced the hard defenses by bioengineering structures; facilitate natural regeneration of riparian vegetation. The project has a total budget of 94.788,5 € and is financed by the Municipality of Besalú.

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	Pirineo Oriental
River basin	El Fluviá

Subcatchment

River name	El Fluviá
Area category
Area (km2)
Maximum altitude category	100 - 200 m
Maximum altitude (m)	140 m0.14 km <br />14,000 cm <br />
Dominant geology
Ecoregion	Ibero-Macaronesian
Dominant land cover	Urban
Waterbody ID

Site

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Name	Besalú
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
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
River corridor land use	Urban
Average bankfull channel width category	10 - 50 m
Average bankfull channel width (m)	1818 m <br />0.018 km <br />1,800 cm <br />
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)	108 m0.108 km <br />10,800 cm <br />
Project started	2008/01/01
Works started
Works completed	2008/03/01
Project completed
Total cost category	50 - 100 k€
Total cost (k€)	94 k€94,000 € <br />
Benefit to cost ratio
Funding sources	Municipality of Besalú

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			Naturalea, S.L.
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Channel pattern/planform, Structure & condition of riparian zones
Biology
Physico-chemical
Other reasons for the project	Bank erosion

Measures

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Structural measures
Bank/bed modifications	New bioengineering elements in order to stabilize slope banks, Bank stabilization and erosion protection
Floodplain / River corridor	Riparian vegetation improvement
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

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
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Any other monitoring, e.g. social, economic

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	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Map of the restoration area

Map of the restoration area

Aerial view of the restoration area

Photos of the area before works

Photos of the area before works

Photos of the area before works

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Photos of the area during works

Photos of the area during works

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Photos of the area after works

Photos of the area after works

Photos of the area after works

Additional documents and videos

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Additional documentation (in Spanish)

Additional links and references

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Link	Description

Supplementary Information

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