Case study:River Tarrant Rehabilitation Project

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Location: 50° 53' 8.71" N, 2° 4' 58.11" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Water quality
Country	England
Main contact forename	Sarah
Main contact surname	Guest
Main contact user ID	User:RachelM
Contact organisation	EA
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project	Tarrant Monkton
This is a parent project encompassing the following projects	No

Photo and map showing location of works

Project summary

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A very uniform 500m section of the Tarrant, with extremely limited existing habitat diversity, was modified using a number of different techniques. The main work involved re-profiling the bed to create some variation in long and cross-section. No re-profiling of banks was undertaken, nor did the work involve any land-take. In the upstream sub-sections A-B live willow logs/stakes were also installed into the river or up the bank slopes in specific locations.

The physical modifications of re-distributing bed material around, installing log deflectors and occasional short stake to form pollards, was completed in just over two days. Work was completed within four days by wiring down firmly each of the installed willow logs and cutting pinning stakes back to log height.

Monitoring surveys and results

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Monitoring was completed before works to detirmine where works should be focused. Monitoring was also completed after the works to establish how successful the project had been.

Lessons learnt

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Image gallery

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Approximate locations for different rehabilitation measures

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) 429.7429.7 m <br />0.43 km <br />42,970 cm <br /> Project started Works started 2013/07/22 Works completed 2013/07/25 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 uniform channel Biology limited habitat diversity Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications bed reprofiling, and branch cuttings of willow and aquatic plants for its stabilization Floodplain / River corridor Planform / Channel pattern flow deflectors 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