Case study:River Stour habitat enhancements at Great Bradley and Little Bradley

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Location: 52° 9' 1", 0° 26' 25"
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Project overview

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Status In progress
Project web site
Themes Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country England
Main contact forename Will
Main contact surname Akast
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk
Partner organisations Dedham Vale AONB and Stour Valley Project
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Woody Debris Flow Deflectors in River Stour near Great Bradley

Project summary

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The ecological value of the River Stour between Great Bradley and Little Bradley is limited by three key factors: poor water quality, control structures and the periodic flushing of large volumes of water through the reach for the Ely-Ouse transfer scheme. Working in partnership with landowners, the Dedham Vale AONB and the Stour Valley Trust this project focused on creating those habitats that are currently lacking. Two kilometres of river habitat was enhanced with fifty woody debris structures installed to create flow diversity and habitat for fish. Large woody material (provided by landowners) was used to enhance the ecology of the River Stour by amplifying natural processes and creating habitat. A second phase of work involving riparian tree planting is planned for 2016.

Monitoring surveys and results

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Site visits with Fisheries, Biodiversity and Geomorphology team and fixed point photography will be used pre- and post-restoration to monitor the evolution of the works over time. Still to be completed.

Lessons learnt

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Some of this work was carried out as part of a River Improvement Week in which Environment Agency staff used environmental leave days to work with colleagues from other teams as well as with volunteers from the Dedham Vale AONB. Feedback about this approach was extremely positive.


Image gallery


Log jam in River Stour near Great Bradley
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Catchment and subcatchment



Site

Name
WFD water body codes GB105036040980
WFD (national) typology
WFD water body name River Stour
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 Yes
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) 2000
2,000 m
2 km
200,000 cm
Project started 2015/04/01
Works started 2015/10/01
Works completed 2015/10/31
Project completed
Total cost category 5000 - 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 Environment Agency Trevor Bond
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Barriers to fish migration
Hydromorphology
Biology
Physico-chemical Water quality
Other reasons for the project


Measures

Structural measures
Bank/bed modifications habitat improvements, Introducing large woody debris, Improvement of natural flows
Floodplain / River corridor Tree planting
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
Before measures After measures Qualitative Quantitative

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

Link Description

Supplementary Information

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