Case study:Hoffer Brook

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Location: 52° 7' 43.94" N, 0° 4' 1.75" E

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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.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit 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 Edit 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 Edit reasons for 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 Edit Measures Structural measures Bank/bed modifications Bed lowering at impoundment and bed raising with gravel (and mesh), bank reprofiling and repair, sensitive desilt, livestock fencing, tree work, installation of cattle drinks Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions 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 Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information