Case study:Restoration of the Charentonne in the Serquigny public garden

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Location: 49° 6' 32.43" N, 0° 42' 57.09" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Monitoring, Social benefits, Spatial planning
Country	France
Main contact forename	Franck
Main contact surname	Perraudin
Main contact user ID
Contact organisation	Mairie de Serquigny
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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In Serquigny, the Charentonne is an urban river split into several strongly altered channels, due to hydropower production. The arm where the restoration works were carried out is fed by a weir upstream and underwent several dredging operations that left it overwidened, with a very low slope, morphologically homegeneous and affected by significant eutrophication. It is now located in a public garden of the town and within the Natura 2000 site "Risle, Guiel, Charentonne". The weir was restored in order to ensure a minimum flow of 300 L/s and a fish pass was installed. Accumulated fine sediments were extracted and used to create vegetated terraces, protected with bioengineerng techniques; a narrower, low flow channel was recreated, with higher slope.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Seine-Normandie River basin Subcatchment River name Charentonne Area category 100 - 1000 km² Area (km2) 513 km²51,300 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Dominant land cover Waterbody ID Site Edit site Name Serquigny public garden WFD water body codes FRH61-0400 WFD (national) typology HER1-9 / HER2-57 WFD water body name Pre-project morphology High width:depth Reference morphology Desired post project morphology Heavily modified water body National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Artificially regulated Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.5290.529 m³/s <br />529 l/s <br /> Average channel gradient category Average channel gradient 0.002619 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 230 m0.23 km <br />23,000 cm <br /> Project started 2001/01/01 Works started 2005/09/01 Works completed 2006/03/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) Benefit to cost ratio Funding sources General Council of the Eure, Agency of Seine-Normandy Water Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 100 - 500 k€ General council of Eure and Lafosse &Fils SARL Bertrand Morandi Stakeholder engagement and communication Agency of Seine-Normandy Water Franck Perraudin Works and works supervision Post-project management and maintenance Monitoring 1 - 10 k€ 6892 k€6,892,000 € <br /> Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Riparian development Hydromorphology Channel pattern/planform, Flow velocities, Structure & condition of riparian zones Biology Invertebrates: Abundance Physico-chemical Other reasons for the project Landscape enhancement, Bank erosion Measures Edit Measures Structural measures Bank/bed modifications Coir rolls, Bank reprofiling Floodplain / River corridor Riparian planting, Protect/restore riparian zone Planform / Channel pattern Re-meandering 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 Invertebrates: Taxonomic composition Yes Yes Yes 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 [[]] Yes 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 links and references Edit links and references Link Description http://www.restauration.georiv.fr/resources/charentonne cs.pdf Description in the French database GeoRiv (in French) Supplementary Information Edit Supplementary Information