Case study:River Can Backwater Restoration

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Project overview

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Status Complete
Project web site
Themes Hydromorphology, Water quality
Country England
Main contact forename Matt
Main contact surname Butcher
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
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Project summary

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Restoration of a former mill channel to improve backwater habitat for fish, plants and invertebrates. Restored mill channel will also act to improve the quality of surface water run-off from adjacent urban area. The River Can is at a Poor Ecological Status and is not meeting WFD objectives for Fish, invertebrates and Macrophytes. Restoring and reconnecting the historic mill channel into the river will create addition habitat. Surface water from the adjacent urban area also discharges into the mill channel. Leaky dams installed in the mill channel will slow the surface water down, allowing any sediment to settle out and filtering any pollution, thus improving water quality. The mouth of the channel has been widened and de-silted. Better connecting the back channel habitat and refuge from both high flows and predators for fish. Warm shallow areas have also been created. which are ideal habitat for fish fry.

Monitoring surveys and results

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By Intercepting run-off and trapping sediment, this scheme will help achieve better water quality preventing the loss of soil, chemicals, nutrients, and faecal organisms. A further benefit is their ability to temporarily capture water and slow down flow. his can reduce localised flooding. Improved back channel habitat that is better connected to the main river will benefit fish invertebrates and plants both in the riparian zone and amin river.

Lessons learnt

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Local authorities own significant amounts of land along all of our main rivers. Working in partnership with them can improve their parkland and nature reserves for amenity, recreation and conservation, benefitting local communities wildlife and reducing flood risk.


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Catchment and subcatchment



Site

Name
WFD water body codes GB105037033840
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
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
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
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€ 10000
10,000 k€
10,000,000 €
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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