Case study:Rehabilitation of the River Brett at Shelley, Suffolk

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Location: 52° 0' 26", 0° 57' 32"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity, Hydromorphology, Water quality
Country England
Main contact forename Trevor
Main contact surname Bond
Main contact user ID User:Tbond
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
Partner organisations Dedham Vale AONB, Suffolk Wildlife Trust
This is a parent project
encompassing the following
projects
River restoration on the River Brett at Shelley
A flow deflector installed on the River Brett upstream of Shelley Bridge

Project summary

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The habitat enhancement work at Shelley was implemented with a view to improving the ecology of the River Brett. The work, which incorporated a variety of techniques including flow deflector installation, berm creation, pool & riffle formation and river bank reprofliing, was part of a wider scheme of works undertaken on the River Stour and its tributaries in 2014.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Composite berm consisting of a downstream flow deflector back-filled with spoil material taken from the originally over-steep embankment. The wooden toe adds stability and protection to the feature.
A second composite berm. Vertical stakes, which hold the berm and wood in place, can be seen.
Some of the Environment Agency staff involved with the implementation of the scheme.
A berm made of soft bed material and reed vegetation. This feature has narrowed the active channel and increased flow velocity locally.
Flow deflector combined with pool excavation to increased habitat diversity. Willow spillings and branches have been included to provide shelter for juvenile fish and invertebrates.
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Catchment and subcatchment

Catchment

River basin district Anglian
River basin Combined Essex

Subcatchment

River name Brett (Lower)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 92
92 m
0.092 km
9,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB105036040930



Other case studies in this subcatchment: River restoration on the River Brett at Shelley


Site

Name River Brett at Shelley
WFD water body codes GB105036040930
WFD (national) typology Low, Medium, Calcareous
WFD water body name River Brett
Pre-project morphology Straightened
Reference morphology Straightened
Desired post project morphology Sinuous
Heavily modified water body Yes
National/international site designation
Local/regional site designations None
Protected species present Yes
Invasive species present Yes
Species of interest Water Vole, Giant Hogweed
Dominant hydrology Groundwater
Dominant substrate Gravel
River corridor land use Intensive agriculture (arable), Improved/semi-improved grassland/pasture
Average bankfull channel width category 5 - 10 m
Average bankfull channel width (m)
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category 0.1 - 1.0 m³/s
Mean annual discharge (m3/s)
Average channel gradient category Less than 0.001
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 800
800 m
0.8 km
80,000 cm
Project started 2014/06/01
Works started 2014/09/29
Works completed 2014/10/03
Project completed 2014/11/21
Total cost category 10 - 50 k€
Total cost (k€)
Benefit to cost ratio
Funding sources Environment Agency Grant in Aid

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Less than 1 k€ Environment Agency Trevor Bond
Stakeholder engagement and communication Less than 1 k€ Dedham Vale AONB Matt Holden
Works and works supervision 1 - 10 k€ Environment Agency Adrian Pearl
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

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Physico-chemical quality elements

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Monitoring documents



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Supplementary Information

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