Case study:Martins River Island

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Location: 50° 42' 53.39" N, 2° 21' 19.93" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Aly
Main contact surname	Maxwell
Main contact user ID	User:Alymaxwell
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:River Frome Rehabilitation Plan
This is a parent project encompassing the following projects	No

File:2d Martins River Island Project Record.pdf

Project summary

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The reach at Ilsington upstream of Nine Hatches on the River Frome has been significantly degraded through dredging and embankment creation through previous land drainage schemes over the past 40 years. In 2009 the Woodsford Channel project improved the reach immediately upstream of Nine Hatches; this project relooked at this reach and an additional 700 metres upstream. The key aspects of the Martins River Island project were to: a) remove the raised embankments (to improve river and floodplain connection. b) to introduce new gravels to replace the historically dredged gravels (providing new spawning habitat), c) introduce large woody debris to the reach d) create new wetland habitats d) new riparian tree planting.

Monitoring surveys and results

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Pre works electro fishing was undertaken at this site. Post works was carried oout in 2013. Repeat survey is not likley until 2016

Lessons learnt

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When adding gravels to the river bed to previously dredged sectiosn be aware ofg the imapct this may have on flood connection during higher flows. Follwing the addition of gravel the two following winters have experienced very high flwos whith significant prolonged out of bank flows for severals months each winter. In this case thelandowner was ok with this but in other projects this may have become a significant issue.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 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 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit 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 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