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	Habitat and biodiversity, Water quality
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.

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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

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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 Edit site 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 Edit project background 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Channel pattern/planform, Structure & condition of riparian zones Biology Physico-chemical Other reasons for the project Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications New bioengineering elements in order to stabilize slope banks, Removal of 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional documentation (in Spanish) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information