Case study:Sediment Pathways Project

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Location: 51° 16' 50.97" N, 1° 27' 36.42" W

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Project overview

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Status	Complete
Project web site
Themes	Land use management - agriculture, Water quality
Country	England
Main contact forename	Ali
Main contact surname	Morse
Main contact user ID
Contact organisation	Test & Itchen Catchment Partnership
Contact organisation web site	http://www.ticp.org.uk
Partner organisations	Wessex Chalkstreams & Rivers Trust & Hampshire & Isle of Wight Wildlife Trust (Catchment Partnership hosting organisations)
This is a parent project encompassing the following projects

Constructing cross drain on farm track

Project summary

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The ‘Sediment Pathways Project’ aims to reduce the existing high levels of fine sediment entering watercourses, via roads, tracks and pathways, within two pilot sub-catchments (Bourne Rivulet & Cheriton Stream) of the Test and Itchen catchment.

The project builds upon the Environment Agency’s ‘Rural Sediment Tracing Project’ (RSTP), which identified and classified catchment sources of fine sediment inputs to streams and rivers within 11 priority catchments, including the Test & Itchen.

Monitoring surveys and results

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Baseline data was collected as part of the Environment Agency’s Rural Sediment Tracing Project investigations. This data showed suspended solid loads in mg/l at five of the project sites. For each site, three readings were collected; upstream of inflow, at the inflow and downstream of inflow.

After completion of the project works, further samples have been collected and the suspended solid readings have been compared with the baseline data. Comparison of the baseline data with the post project work data demonstrates that the mitigation measures have been effective at reducing inputs of fine sediment at all of the sites.

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Sediment Pathways Project WFD water body codes WFD (national) typology WFD water body name Bourne Rivulet & Cheriton Stream 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 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 Reducing fine sediment content, Land drainage Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Disconnecting prime sources of diffuse sediment from the waterways Planform / Channel pattern Other Non-structural measures Management interventions Walkover surveys and water sample data collection 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