Case study:Hoffer Brook

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Location: 52° 7' 44", 0° 4' 2"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology
Country England
Main contact forename Ruth
Main contact surname Hawksley
Main contact user ID User:RuthHawksley
Contact organisation Wildlife Trust for Cambridgeshire
Contact organisation web site http://www.wildlifebcn.org
Partner organisations South Cambs DC, Environment Agency
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Plastic mesh base for gravel

Project summary

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River restoration including use of plastic mesh to stabilise silt bed before bed raising with gravel. Creation of point bars, bank reprofiling and rebuilding and fencing were also part of the project.

Monitoring surveys and results

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Invertebrate monitoring prior to work found only worms and leeches. Freshwater shrimp and blackfly larvae colonised very rapidly and a few months later mayfly larvae, caddis larvae and water beetles were also present.

Lessons learnt

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So far the mesh is working well, and unlikely to fail for a long time. It will be interested to revisit in 10 or 20 years to see what happens to the new gravel bed. Invertebrates colonised the new habitat quickly and it is hoped that trout will spawn there one day.

Cattle drinks were created with a gravel bed and fencing - in hindsight more gravel in each would have been better.


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Catchment and subcatchment



Site

Name Hoffer Brook
WFD water body codes GB105033038120
WFD (national) typology Low, Small, Calcareous
WFD water body name Rhee
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body Yes
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 2013/02/01
Works started
Works completed
Project completed 2014/05/01
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
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Impoundments (not hydropower)
Hydromorphology Low flows, historic dredging, poaching by cattle
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bed lowering at impoundment and bed raising with gravel (and mesh), Bank reprofiling, Sensitive desilt, Livestock fencing, Tree management, Cattle drinkers
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
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

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Supplementary Information

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