Case study:Tarrant Monkton Rehabilitation Project

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Location: 50° 52' 45.12" N, 2° 4' 52.82" 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
Country	England
Main contact forename	Sarah
Main contact surname	Guest
Main contact user ID	User:RachelM
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The work was based on conceptual outline plans provided by Nigel Holmes and Allan Frake working for Casterbridge Fisheries interpreted and supervised the installation of in channel features and woody debris/flow deflectors. The need for a more sustainable solution to the obstruction to fish passage at Manor Farm was identified, alongside opportunities to improve stream habitat and re-energise the watercourse. Habitat enhancements will create a faster, more variable flow regime and a more diverse habitat, which will help to promote a unique range of important animal and plant species. Physical habitat enhancements coupled with good land use management, including appropriate fencing and grazing regimes, will also contribute to achieving good ecological status under WFD. A better quality habitat may help species build resilience to the changes associated with climate change.

Monitoring surveys and results

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Periodic visits to the site will be made to help ensure grazing management is ideal for the conditions that develop. Tree growth or failure to grow should be monitored. Repeat photographs are recommended for the archive. Biological monitoring may be of limited value if pre-conditions have not been recorded. The creation of an accurately scaled diagram of the location and extent of each feature will also facilitate ease of repeating the As Built mapping survey to ascertain how the channel and the installations respond to the various flow and non-flow conditions and how the channel evolves physically and ecologically over time.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district South West River basin Dorset Subcatchment River name TARRANT Area category 10 - 100 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 263263 m <br />0.263 km <br />26,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108043016070 Other case studies in this subcatchment: River Tarrant Rehabilitation Project Site Edit site Name WFD water body codes GB108043016070 WFD (national) typology WFD water body name TARRANT 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 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) 413.2413.2 m <br />0.413 km <br />41,320 cm <br /> Project started Works started 2013/09/30 Works completed 2014/10/04 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 barrier to fish migration Biology improve in-stream habitats Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Flow deflectors, Introducing large woody debris 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