Case study:3Rivers - Lumburn:Walkham:Tavy

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Location: 50° 31' 45.52" N, 4° 9' 38.87" W

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Project overview

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Status	In progress
Project web site	http://http://wrt.org.uk/project/3rivers-project/
Themes	Water quality
Country	England
Main contact forename	Hazel
Main contact surname	Kendall
Main contact user ID	User:David chapman
Contact organisation	Westcountry Rivers Trust
Contact organisation web site	http://wrt.org.iluk
Partner organisations	Devon Wildlife Trust, South West Water, Tamar Valley AONB, Tavy Walkham and Plym Fishing Club
Parent multi-site project
This is a parent project encompassing the following projects	No

Project picture

Project summary

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The project focused on Water Framework Directive Failures on these three rivers which largely related to phosphate inputs. There are a range of diffuse and point source phosphate inputs into these rivers from both rural and urban sources. We worked with partners to contact farmers who were likely to be having impacts through their land based activities and households who may have impacts through the use of non-mains foul drainage systems.

26 farm visits and associated integrated farm plans were undertaken, three agricultural events were attended and three agricultural demonstrations were delivered (soil decompaction, cross compliance, efficient slurry spreading). Three farm grants (surface water management x 2, streamside fencing) were also completed.

With regard to urban drainage, over 100 of the most vulnerable properties on non-mains drainage were visited to disseminate information on the recently introduced General Binding Rules. Local estate agents were also contacted to help disseminate information on the General Binding Rules as were the caravan/ campsites in this area (8).

Other actions included the completion of 15km of river walkover surveys, engaging and training 14 volunteers, and half a hectare of native broadleaf woodland was planted.

Monitoring surveys and results

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Water chemistry testing was regularly undertaken as part of the project to help identify phosphate sources. This testing was undertaken by Westcountry Rivers Trust and Students from Plymouth University. A more detailed study of metals in these rivers was also undertaken to help to understand more fully the historical issue with regard to heavy metals in the catchments.

Lessons learnt

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Relatively short term projects (12 months or less) such as this make it difficult to build moment to any degree and identify and contact the most relevant land/ home owners with regard to impact on the rivers. Higher impact farms, such as the larger dairy units are particularly difficult to engage. Householders on non-mains drainage are also difficult to engage with through the normal methods such as attendance at events and markets etc.; the most effective way of engaging with non-mains drainage householders was through cold calling.

Good numbers of volunteers were available for tasks such as the undertaking of walkover surveys.

Landowners were reticent to plant trees, generally because land is being used for agricultural and the grants available for tree planting aren't significant.

Further water quality monitoring is required to provide greater details of phosphate and other pollution inputs.

Image gallery

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Newly planted trees - Lower Tavy

Farmers event - Soil de-compaction, River Walkham

Water Quality Testing, Black Brook, River Walkham

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 Tamar Subcatchment River name Lower River Tavy Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 437437 m <br />0.437 km <br />43,700 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB108047007840 Site Edit site Name Rivers Lumburn, Walkham and Lower Tavy WFD water body codes GB108047007850, GB108047007870, GB108047007840 WFD (national) typology WFD water body name Lumburn, Walkham, Lower Tavy 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 Pollution incident Hydromorphology Biology Physico-chemical Phosphate Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor floodplain woodland planting Planform / Channel pattern Other Non-structural measures Management interventions Land management Social measures (incl. engagement) Volunteer engagement Other Survey work 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