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
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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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Image gallery


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
Photos of the area before works
Photos of the area during works
Photos of the area during works
Photos of the area during works
Photos of the area after works
Photos of the area after works
Photos of the area after works
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Catchment and subcatchment

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

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

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

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


Measures

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

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

Biological quality elements

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

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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