Case study:Restoring the River Doquette to its original bed

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Location: 48° 55' 23.07" N, 1° 14' 35.20" W

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Project overview

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Status	Complete
Project web site
Themes
Country	France
Main contact forename	Fabien
Main contact surname	Goulmy
Main contact user ID
Contact organisation	Fédération de la Manche pour la pêche et la protection du milieu aquatique
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Doquette

Project summary

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The Doquette is a small salmonid river, tributary of the River Sienne. The river is home to brown trout and bullhead; it is also likely to be colonised by Atlantic salmon. In the 1970s, a part of the Doquette was moved into a straight channel at the edge of a field. The original bed was retained and transformed into a drainage ditch. The river, now in a “raised” position, deteriorated. The flow patterns became uniform and the habitats of the low water channel became homogenised. Since being moved, the Doquette flowed over the bedrock and could dry out during the low-flow period. In application of the multi-annual restoration and maintenance programme for the catchment area of the River Sienne, there were plans to erect fencing along the raised river. The landowner, who had two channels on his plot, requested modifications in order to avoid the erection of fencing along both the raised river and the drained river. This double intervention would indeed have posed certain problems relating to the use of this land. The local institute in collaboration with the departmental fishing federation, thus proposed to restore the Doquette to its former bed, which would then be the only section to be fenced. The original river bed was wider (mean width of 4.5 metres). 136 tonnes of aggregates were brought in from a quarry and deposited in the river. 77 tonnes of stones and pebbles (from 0 to 250 mm), were used to form the armour layer, with the remaining 59 tonnes being used to reconstitute the alluvial mattress. A connection was made with the river, while the existing connection with the straightened bed was blocked. The old, spring-fed channel was not filled in. Both banks of the restored river were fenced and a ford crossing and drinking trough were installed.

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Image gallery

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The Doquette in June 2008, prior to restoration with its raised bed (on the left) and its natural bed now used as a drainage ditch (on the right).

The works phase during the restoration of the Doquette in October 2008.

The works phase during the restoration of the Doquette in October 2008: introduction of coarse materials in order to reconstitute the alluvial mattress of the river bed.

The Doquette in October 2008, after the restoration works.

The Doquette in May 2009, seven months after the restoration.

The Doquette after restoration in the summer of 2009. The flows have diversified.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Seine-Normandie River basin sienne Subcatchment River name Doquette Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Plains Dominant land cover agriculture, forest Waterbody ID Site Edit site Name Percy WFD water body codes I70490000 WFD (national) typology WFD water body name Pre-project morphology 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, Groundwater Dominant substrate Gravel River corridor land use Intensive agriculture Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) 2.22.2 m <br />0.0022 km <br />220 cm <br /> Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.050.05 m³/s <br />50 l/s <br /> Average channel gradient category Average channel gradient 0.0011 Average unit stream power (W/m2) 0.2451750.245 W/m² <br /> Project background Edit project background Reach length directly affected (m) 240 m0.24 km <br />24,000 cm <br /> Project started Works started 2008/10/01 Works completed 2008/10/01 Project completed Total cost category Less than 10 k€"Less than 10 k€" is not in the list (Less than 1 k€, 1 - 10 k€, 10 - 50 k€, 50 - 100 k€, 100 - 500 k€, 500 - 1000 k€, 1000 - 5000 k€, 5000 - 10000 k€, more than 10000 k€) of allowed values for the "Total cost category" property. Total cost (k€) 9 k€9,000 € <br /> Benefit to cost ratio Funding sources Water Agency, Regional Council, Fédération de la Manche pour la pêche et la protection du milieu aquatique 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 1 - 10 k€ 9 k€9,000 € <br /> Fédération de la Manche pour la pêche et la protection du milieu aquatique Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Structure & condition of riparian zones Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Introducing sediment Floodplain / River corridor Planform / Channel pattern Re-instatement of old course, Re-instatement of sinuosity Other Non-structural measures Management interventions Promoting riparian vegetation Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 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). Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information