Case study:Refilling the meanders of the Colostre

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Location: 43° 47' 59.23" N, 6° 2' 28.12" E

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Project overview

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Status	Complete
Project web site
Themes
Country	France
Main contact forename	Vincent
Main contact surname	Duru
Main contact user ID
Contact organisation	FDPPMA Alpes-de-Haute-Provence
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	Alpes-de-Haute-Provence
River basin	Rhône-Mediterranean

Subcatchment

River name	Colostre
Area category	100 - 1000 km²
Area (km2)	215 km²21,500 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion	Alps
Dominant land cover
Waterbody ID

Site

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Name	Regional Natural Park of Verdon
WFD water body codes	FRDR251
WFD (national) typology
WFD water body name
Pre-project morphology	Single channel, Straight
Reference morphology	Sinuous
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	Quick run-off, Artificially regulated
Dominant substrate
River corridor land use
Average bankfull channel width category	2 - 5 m
Average bankfull channel width (m)	44 m <br />0.004 km <br />400 cm <br />
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	0.670.67 m³/s <br />670 l/s <br />
Average channel gradient category
Average channel gradient	1e-005
Average unit stream power (W/m2)	0.0164267250.0164 W/m² <br />

Project background

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Reach length directly affected (m)	11000 m11 km <br />1,100,000 cm <br />
Project started	1996/01/01
Works started	1999/01/01
Works completed	2001/01/01
Project completed
Total cost category	50 - 100 k€
Total cost (k€)	66 k€66,000 € <br />
Benefit to cost ratio
Funding sources	Water Agency, Regional Council, Dèpartment-level Council, Higher Fishing Council, Local fishing associations

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	50 - 100 k€	66 k€66,000 € <br />	Conseil Supérior de la Pêche-Departmental Brigade
Post-project management and maintenance			Conseil Général (Départment Level Council)
Monitoring			Conseil Supérior de la Pêche-Departmental Brigade

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Continuity for organisms, Continuity of sediment transport, Width & depth variation, Structure & condition of riparian zones, Channel pattern/planform
Biology	Fish: Abundance, Fish: Disturbance-sensitive species
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Removal of weirs
Floodplain / River corridor
Planform / Channel pattern	Removal of poplars in old meanders, Re-meandering
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)	Agreement with the owners, Public meetings in each commun affected by the project
Other	River contract

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

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
Macrophytes & phytobenthos: Taxonomic composition		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
Presence of beavers		Yes				Improvement

Monitoring documents

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Image gallery

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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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