Case study:Removal of twenty small structures and diversification of the Main Channel of the River Couasnon

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Project overview

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Status Complete
Project web site
Themes
Country France
Main contact forename Sylvain
Main contact surname Royet
Main contact user ID
Contact organisation Syndicat Intercommunal pour l'amènagement of Couasnon
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
projects 		No
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Project summary

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Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Catchment

River basin district Loire-Bretagne
River basin Pays-de-la-Loire

Subcatchment

River name Couasnon
Area category more than 10000 km²
Area (km2)
Maximum altitude category 500 - 1000 m
Maximum altitude (m)
Dominant geology Siliceous
Ecoregion Western Plains
Dominant land cover Extensive agriculture, Woodland, Urban
Waterbody ID



Site

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Name Maine-et-Loire
WFD water body codes FRGR0453
WFD (national) typology
WFD water body name
Pre-project morphology two arms, straightened, risized
Reference morphology
Desired post project morphology
Heavily modified water body true
National/international site designation EU - Special Protected Area
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology Artificially regulated
Dominant substrate
River corridor land use Intensive agriculture
Average bankfull channel width category 2 - 5 m
Average bankfull channel width (m) 3.53.5 m <br />0.0035 km <br />350 cm <br />
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s) 0.9290.929 m³/s <br />929 l/s <br />
Average channel gradient category
Average channel gradient 0.0018
Average unit stream power (W/m2) 4.68550444.686 W/m² <br />


Project background

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Reach length directly affected (m) 26686 m26.686 km <br />2,668,600 cm <br />
Project started
Works started 2006/06/01
Works completed 2009/08/01
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 207 k€207,000 € <br />
Benefit to cost ratio
Funding sources Water Agency

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 100 - 500 k€ 207 k€207,000 € <br /> Water Agency
Post-project management and maintenance
Monitoring



Reasons for river restoration

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Mitigation of a pressure Abstraction
Hydromorphology Quantity & dynamics of flow, Continuity for organisms
Biology
Physico-chemical Temperature
Other reasons for the project Flood risk management


Measures

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Structural measures
Bank/bed modifications Removal of 22 flaps, Introducing sediment
Floodplain / River corridor Creation of a flood expansion area
Planform / Channel pattern
Other Prohibition of pumping of water
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
Quantity & dynamics of flow Yes
Channel pattern/planform Yes

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
Fish: Species composition Yes
Invertebrates: Taxonomic composition Yes
Invertebrates: Abundance

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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Additional links and references

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Link Description

Supplementary Information

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