Case study:The South Cornwall River Improvement Project

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Location: 50° 9' 36.67" N, 5° 20' 46.40" W

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progress\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Water quality\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"The South Cornwall River Improvement Project \u2013 Crinnis","link":"","lat":50.359918402646,"lon":-4.8003387451172,"icon":"/wiki/images/a/af/Red_marker.png"},{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E The South Cornwall River Improvement Project \u2013 Gorran Stream\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=England\" title=\"England\"\u003EEngland\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E In progress\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Water quality\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"The South Cornwall River Improvement Project \u2013 Gorran Stream","link":"","lat":50.293726104507,"lon":-4.8545837402344,"icon":"/wiki/images/a/af/Red_marker.png"},{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E The South Cornwall River Improvement Project \u2013 Polmear stream\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=England\" title=\"England\"\u003EEngland\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E In progress\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Water quality\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"The South Cornwall River Improvement Project \u2013 Polmear stream","link":"","lat":50.352470894937,"lon":-4.669189453125,"icon":"/wiki/images/a/af/Red_marker.png"},{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E The South Cornwall River Improvement Project \u2013 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progress\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Water quality\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"The South Cornwall River Improvement Project \u2013 Warleggan","link":"","lat":50.078294547389,"lon":-5.625,"icon":"/wiki/images/a/af/Red_marker.png"}]}

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Project overview

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Status	In progress
Project web site	http://www.wrt.org.uk/projects/crf.html
Themes	Economic aspects, Habitat and biodiversity, Social benefits, Water quality
Country	England
Main contact forename	Giles
Main contact surname	Rickard
Main contact user ID
Contact organisation	Westcountry Rivers Trust
Contact organisation web site	http://www.wrt.org.uk/
Partner organisations	IMERYS, Environment Agency, South West Water, Cornwall Council, South West Rivers Association, Natural England, Heligan Gardens, Forestry Commission
This is a parent project encompassing the following projects	The South Cornwall River Improvement Project - Mevagissey River, The South Cornwall River Improvement Project - River Par, The South Cornwall River Improvement Project - St. Austell, The South Cornwall River Improvement Project – Bokiddicks Stream, The South Cornwall River Improvement Project – Crinnis, The South Cornwall River Improvement Project – Gorran Stream, The South Cornwall River Improvement Project – Polmear stream, The South Cornwall River Improvement Project – Portmellon Stream, The South Cornwall River Improvement Project – Warleggan

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Project summary

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The SCRIP project is a partnership that will use CRF funds to manage restoration work to deliver habitat improvements on the rivers that drain South Cornwall and the St Austell bay area. The partnership, led by the Westcountry Rivers Trust, has been carrying out river restoration and addressing the causes of Water Framework Directive issues together for many years.

Through restoration work, the project will address issues including:

• flow modifications and habitat degradation;
• diffuse pollution from agriculture;
• barriers to fish migration;
• interrupted conveyance of river gravels reducing spawning habitats for salmonids;
• impacts from china clay extraction and historic mining

Description of Works

To tackle issues in the South Cornwall and St Austel Bay area, the SCRIP project will manage delivery of the following activities:

• Weir & Culvert Easements – Direct physical action to improve the connectivity of the river for multiple migrating species (fish and/or eels), therefore removing the factor that is causing the waterbody to fail for fish;
• Habitat creation – Creation of in-stream flow deflectors to create riffle/pool sequences in the long channelised section of river which lack habitat heterogeneity
• Gravel introduction - Restoration of fish spawning habi- tat by means of gravel intro-duction will increase spawning rates, and sur-vival of the early stages of salmonid and other fishes life cycle
• Fencing – Where agricultural input is a causative issue of failure under WFD (phosphate), target-ed riparian fencing along with associated drinking points will be constructed by working with key farmers and landowners within the catchment. There are multiple benefits which include reduced poaching of banks caused by livestock, it also allows a patchwork mosaic of different riparian habitat growth (when done well). Fencing also acts as a partial capture system to in- cept land and road run off and increases in stream ecological diversity.

• Culvert mitigation - Culverts to be adjusted to improve river continuity including bed load and mi-gratory fish.
• Nutrient management – Soil tests will be available for farmers in key catchments to help reduce diffuse pollution and phosphate loss and improve nutrient management on farm.
• Interpretation/Geocache - Boards-Interpretation areas will be installed to disseminate information and engage and educate local users

What will success look like?

Success in the rivers of South Cornwall will include the direct delivery of the above WFD targeted actions but will also include the development of a strong partnership that brings together local communities and encourages them to take pride and ownership of the issues affecting the catchment they live in. By promoting this awareness and ensuring that the local community understands their de-pendence on these natural resources, we aim to ensure the project is not only successful in the short term, but will be sustainable and continued into the future.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name St Neot; Rivers Par, St Austell, Mevagissey, Warleggan, Avon, Crinnis, Polmear stream, Gorran Stream, Portmellon Stream and Bokiddicks Stream WFD water body codes 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 2012/06/22 Works started Works completed Project completed 2015/03/31 Total cost category 500 - 1000 k€ Total cost (k€) 437,444437,444 k€ <br />437,444,000 € <br /> Benefit to cost ratio Funding sources Catchment Restoration Fund; match funding 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 Supplementary funding information £410,444 from CRF, £27,000 from match funding Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Diffuse pollution, Aggregate/mineral extraction Hydromorphology Quantity & dynamics of flow Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Create riffle/pool Planform / Channel pattern Introduction of gravel Other Non-structural measures Management interventions Social measures (incl. engagement) Boards-Interpretation areas will be installed to disseminate information and engage and educate local users 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 RRC Monitoring table - South Cornwall River Additional documents and videos Upload additional documents CRF Project briefing note - South Cornwall River Additional links and references Edit links and references Link Description http://www.wrt.org.uk/projects/crf.html leaflets http://www.wrt.org.uk/projects/2013-04-23 SCRIP%20Briefing%20Note.pdf briefing note http://www.environment-agency.gov.uk/ The UK Environmet Agency is an Executive Non-departmental Public Body responsible to the Secretary of State for Environment, Food and Rural Affairs.The principal aims are to protect and improve the environment, and to promote sustainable development. http://www.southwestwater.co.uk/ South West Water is part of Pennon Group plc. Provide reliable, efficient and high quality drinking water and waste water services throughout Cornwall and Devon and in small areas of Dorset and Somerset. http://www.cornwall.gov.uk/default.aspx Cornwall Council is the unitary authority for Cornwall, in England, United Kingdom. http://www.naturalengland.org.uk/ Natural England is an Executive Non-departmental Public Body responsible to the Secretary of State for Environment, Food and Rural Affairs. The purpose is to protect and improve England’s natural environment and encourage people to enjoy and get involved in their surroundings. Supplementary Information Edit Supplementary Information