Case study:Recreation of a low-flow sinuous channel in an urban stretch of the Montvaux stream

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Location: 49° 7' 22.22" N, 6° 4' 49.70" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality, Urban
Country	France
Main contact forename	municipality
Main contact surname	Municipality of Chatel-Saint-Germain
Main contact user ID
Contact organisation	Municipality of Châtel-Saint-Germain
Contact organisation web site	http://www.chatel-saint-germain.fr/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The Montvaux stream before and after restoration works.

Project summary

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The Montvaux stream, is a 10 Km long tributary of the Moselle. Upstream of the municipality of Châtel-Saint-Germain, this river still has good hydromorphological characteristics. Conversely, crossing the urban area of Châtel-Saint-Germain, the river was straightened, the banks were stabilized by the creation of a concrete channel, with a rectangular oversized (5 to 6 meters wide)cross-section . Originally, these works allowed to create storage pools in order to feed mills and forges. Afterwards, as a result of the uptake of the main sources in the valley for drinking water supply, the water depth at low water had become very low, reduced to 1-3 centimeters. This induced reduction of the aquatic habitats, eutrophication of the environment and bas smells. The substrate of the bottom of the bed, the flow speed and the bed depth were homogenized, degrading habitats and preventing the development of aquatic life. Faced with the deterioration of the watercourse, both in terms of landscape and of morphological and biological features, the municipality of Châtel-Saint-Germain decided to undertake a restoration project. The works included the redesigning of a meandering low flow channel and the introduction of benches. The low-flow channel was made using topsoil wrapped in coir geotextile. The banks were seeded with a mixture of grass species and about 700 helophytes were planted the following year.

Monitoring surveys and results

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After project management was reduced to a biennial cutting of the banks vegetation and, when needed, removal of waste (plastic, etc…) and of major obstacles to the flow. A preliminary study was carried out in 1996. After works, no scientific monitoring was planned, but the river banks were vegetated and the diversification of flows and bed depth was ensured. There were no longer stagnant water or siltation.

Lessons learnt

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Image gallery

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The Montvaux stream in Châtel-Saint-Germain, before the restoration works.

The Montvaux stream during the restoration works (October 1999).

The Montvaux stream eight months after the restoration, in June 2000..

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rhin-Meuse River basin Lorraine Subcatchment River name Montvaux Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Western Plains Dominant land cover Urban Waterbody ID Site Edit site Name Montvaux WFD water body codes FRCR354 WFD (national) typology WFD water body name Pre-project morphology Single channel, Straight, Entrenched Reference morphology Single channel, Sinuous Desired post project morphology Heavily modified water body true National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Quick run-off Dominant substrate Bedrock River corridor land use Urban Average bankfull channel width category Less than 2 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.20.2 m³/s <br />200 l/s <br /> Average channel gradient category Average channel gradient 2.4 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 400 m0.4 km <br />40,000 cm <br /> Project started 1999/10/01 Works started 1999/10/01 Works completed 1999/12/01 Project completed Total cost category Total cost (k€) 147 k€147,000 € <br /> Benefit to cost ratio Funding sources Water Agency, Direction régionale de l’environnement (DIREN) Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 10.6710.67 k€ <br />10,670 € <br /> Stakeholder engagement and communication Water Agency Works and works supervision 137.2137.2 k€ <br />137,200 € <br /> Water Agency Post-project management and maintenance Water Agency Monitoring 1 - 10 k€ Water Agency Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Quantity & dynamics of flow, Channel pattern/planform, Width & depth variation Biology Fish: Abundance, Invertebrates, Macrophytes Physico-chemical Oxygen balance, Nutrient concentrations Other reasons for the project Landscape enhancement, Recreation Measures Edit Measures Structural measures Bank/bed modifications Extensive planting, Introduction of gravel Floodplain / River corridor Planform / Channel pattern Adding sinuosity Other Non-structural measures Management interventions Social measures (incl. engagement) Improved public access Other Information provision, Participation in design Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Quantity & dynamics of flow Yes No No No No Improvement Channel pattern/planform Yes No No No No Improvement Width & depth variation Yes No No No No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Yes Yes Yes Improvement Macrophytes Yes Yes Improvement 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 Public awareness of river Yes Yes Yes Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Case study description by ONEMA (French National Agency for Water and Aquatic Environments) (in French) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information