Case study:Langonnet river

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Location: 48° 7' 31", 3° 28' 31"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Monitoring, Hydromorphology, Water quality
Country France
Main contact forename
Main contact surname
Main contact user ID
Contact organisation (FORECASTER)
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
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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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Catchment

River basin district Loire-Bretagne
River basin Loire

Subcatchment

River name Langonnet
Area category 10 - 100 km²
Area (km2) 34 km²
3,400 ha
Maximum altitude category 100 - 200 m
Maximum altitude (m)
Dominant geology Siliceous
Ecoregion Central Plains
Dominant land cover
Waterbody ID



Site

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Name Langonnet River
WFD water body codes FRJ471400A
WFD (national) typology HER1-12 / HER2-60 (FRJ471400A
WFD water body name
Pre-project morphology Single channel, Straight
Reference morphology Single channel, Sinuous
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
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)
Average channel gradient category
Average channel gradient 0.005117
Average unit stream power (W/m2)


Project background

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Reach length directly affected (m) 5300 m
5.3 km
530,000 cm
Project started 2000/01/01
Works started
Works completed 2006/01/01
Project completed
Total cost category more than 10000 k€
Total cost (k€)
Benefit to cost ratio
Funding sources

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design more than 10000 k€ 150315 k€
150,315,000 €
Fishermen (20%) Yohann Fuentes
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance 5000 - 10000 k€
Monitoring FDPPMA 56.



Reasons for river restoration

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Mitigation of a pressure
Hydromorphology Channel pattern/planform, Quantity & dynamics of flow, Width & depth variation
Biology Fish: Species composition
Physico-chemical Temperature
Other reasons for the project Landscape enhancement


Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern re-meandering
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
Channel pattern/planform Yes 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 Yes

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
Temperature Yes Yes


Monitoring documents

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Additional links and references

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Supplementary Information

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