Case study:River restoration project in Congost between the torrent of Malhivern and end of the municipality of La Garriga

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Location: 41° 39' 47.51" N, 2° 17' 20.00" 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 restored section has a length of 650m, a common channel between 4 and 6 m and a width of 35m in ordinary floods. The slope of the river terrace is bound by dikes and embankments in some places not stabilized in others and longitudinal continuity of the river influenced by two rip-raps. There are occupations of the river area for industrial activities and eventually discharges of debris. As relevant to vegetation, effects of overgrazing are detected and a significant proliferation of exotic species. The main objectives of this project are: limit the presence and possible expansion of invasive exotic species of vascular plants; removal of non-functional riprap stretches the right margin; increase morphological heterogeneity in the right margin; promote the recovery of native riparian vegetation; minimize the impact of human activities taking place in the fluvial environment and are likely to maintain or produce impacts; improving the landscape and the river ecosystem. The project has a total budget of 155.568,08 € and is financed by the Consorci of Besós.

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	Besós

Subcatchment

River name	Congost
Area category
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)	210 m0.21 km <br />21,000 cm <br />
Dominant geology
Ecoregion	Ibero-Macaronesian
Dominant land cover
Waterbody ID

Site

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Name	Río Congost
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
Dominant substrate
River corridor land use
Average bankfull channel width category	5 - 10 m
Average bankfull channel width (m)	66 m <br />0.006 km <br />600 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)	650 m0.65 km <br />65,000 cm <br />
Project started	2009/11/01
Works started
Works completed	2010/03/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	155 k€155,000 € <br />
Benefit to cost ratio
Funding sources	Consorci del Besós

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	Landscape enhancement

Measures

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Structural measures
Bank/bed modifications	New bioengineering elements in order to stabilize slope banks, Removal rip-rap
Floodplain / River corridor	Removal of exotic plants
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
	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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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

Krainer type network placed in the area

Krainer type network placed in the area

Krainer type network placed in the area

Photos of the removal of American reed (Arundo donax)

Photos of the removal of American reed (Arundo donax)

Photos of the area before and after works

Photos of the area before and after works

Photos of the area before and 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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