Case study:Restoration of the previous riverbed of the Dadon

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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology, Water quality, Monitoring
Country France
Main contact forename Regis
Main contact surname Talguen
Main contact user ID
Contact organisation d’aménagement du Chéran
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 Rhône - Méditerranée
River basin Haute-Savoie

Subcatchment

River name Dadon
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 500 - 1000 m
Maximum altitude (m)
Dominant geology Siliceous
Ecoregion Western Highlands
Dominant land cover
Waterbody ID



Site

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Name Dadon
WFD water body codes FRDR11706
WFD (national) typology
WFD water body name
Pre-project morphology Single channel, Straight
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, Cobble, Gravel
River corridor land use Extensive agriculture, Grassland
Average bankfull channel width category 5 - 10 m
Average bankfull channel width (m)
Average bankfull channel depth category 2 - 5 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s) 0.90.9 m³/s <br />900 l/s <br />
Average channel gradient category
Average channel gradient 0.25
Average unit stream power (W/m2)


Project background

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Reach length directly affected (m) 1000 m1 km <br />100,000 cm <br />
Project started 2004/05/01
Works started 2004/05/01
Works completed 2009/09/01
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Water Agency, SMIAC, Councils of Savoie and Haute-Savoie

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Water Agency
Stakeholder engagement and communication Water Agency
Works and works supervision Water Agency
Post-project management and maintenance Water Agency
Monitoring Water Agency



Reasons for river restoration

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Mitigation of a pressure Riparian development
Hydromorphology Width & depth variation, Flow velocities, Quantity & dynamics of flow, Channel pattern/planform, Continuity for organisms
Biology Fish: Species composition, Fish: Abundance
Physico-chemical
Other reasons for the project Bank erosion, Landscape enhancement


Measures

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Structural measures
Bank/bed modifications Implementation of rip rap, Habitat diversification, Implementation of vegetated boxes, Depth variation, Restoration of original bed
Floodplain / River corridor
Planform / Channel pattern Creation of meanders, Creation of sinuosity
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
Width & depth variation Yes Yes Yes Improvement
Channel pattern/planform Yes Yes Yes Improvement

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 Yes Yes Improvement
Fish: Abundance Yes Yes Yes Improvement

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 documents and videos

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Additional links and references

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Link Description

Supplementary Information

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