Case study:River Tat Restoration Scheme

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Location: 52° 49' 3.92" N, 0° 45' 26.84" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Monitoring
Country	England
Main contact forename	Adam
Main contact surname	Thurtle
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk/
Partner organisations	Water Management Alliance, Natural England, Atkins, Pynkney Hall Estate
Parent multi-site project	Case_study:Wensum River Restoration Strategy
This is a parent project encompassing the following projects	No

Restored section of River Tat, March 2014

Project summary

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The River Tat is a tributary of the River Wensum and forms part of the River Wensum Site of Special Scientific Interest. The planform and channel geometry has historically been subjected to significant modification including diversions, straightening, widening and the construction of an online lake system. The aim of the restoration work was to ‘kick start’ natural morphological processes throughout the reach.

A design report was written for the site which outlined the range of restoration measures that could be used. However, the design was extremely flexible and the location of different features was determined by a combination of expert judgement and working with existing channel features. On the ground works were delivered by an experienced Environment Agency Field Services team who have become skilled at delivering this type of restoration work.

In locations where a gravel bed was present, albeit beneath a layer of sand/silt because of the homogeneous character of the water course, gravel glides have been restored by re-distributing the bed material to form glide-pool sequences. The water velocity has been increased by narrowing the channel, using features such as earth berms and woody debris, resulting in a clean gravel bed. Deep pools have been dug to introduce variations in bed levels, providing flow diversity and creating resting areas for fish.

A key restoration measure has been the installation of Large Woody Debris (LWD). Reducing tree cover in heavily shaded areas, by selective coppicing, provides a sustainable source of material. This also allows light onto the river, promoting marginal vegetation to establish. LWD has introduced flow diversity, helping keep the gravels free from silt and providing overhead cover for fish.

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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 Anglian River basin Broadland Rivers Subcatchment River name Tat Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 6868 m <br />0.068 km <br />6,800 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105034051140 Site Edit site Name WFD water body codes GB105034051140 WFD (national) typology WFD water body name Tat 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) Project started 2013/05/01 Works started Works completed Project completed 2014/07/01 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 Hydromorphology Biology Improving SSSI site, Fish: Abundance Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Cleaning of spawning gravels, Creation of pools and riffles Floodplain / River corridor Installing riverside fencing Planform / Channel pattern Introducing large woody debris, Creation of wooden 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