Case study:Nobles Green Ditch River Restoration

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Location: 51° 35' 10.99" N, 0° 36' 17.54" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Water quality
Country	England
Main contact forename	Matt
Main contact surname	Butcher
Main contact user ID
Contact organisation
Contact organisation web site
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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Installing woody debris flow deflectors to improve habitat and morphology of Nobles Green Ditch. Nobles Green Ditch has historically ben heavily modified to improve flood protection and land drainage. It is failing to meet its WFD objectives for invertebrates. The mitigation measures assessment for the river revealed that measures were needed to improve in-channel morphological diversity. This project aims to address these issues.

Monitoring surveys and results

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Research undertaken by the wildlife trusts concluded that 147 species of river invertebrates are closely associated with woody debris. These features directly provide habitat for such species. Furthermore, woody debris flow deflectors improve river morphology, creating differential areas of fast and slow flowing water. Energetic, faster flowing water improves sediment transfer, helping to keep gravels clean. It is also important for the formation of features such as riffles and pools as well as meanders. Slower flowing water provides a refuge for fish and invertebrates from high flows, and allows silt to settle out, eventually forming berms which will improve diversity of flow and plant communities.

Lessons learnt

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Involving communities in river restoration projects not only improves understanding and ensures long term support for projects but volunteers can help keep project costs down, enabling us to achieve more limited budgets.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes GB105037028743 WFD (national) typology WFD water body name 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 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 500 - 1000 k€ 10001,000 k€ <br />1,000,000 € <br /> 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