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Published byKerrie Greene Modified over 6 years ago
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WAgriCo An Opportunity for Improving Drinking Water Quality
Luke de Vial Water Resources Manager Wessex Water
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Impact of diffuse pollution
Solutions Examples of catchment management Pesticides Empool WAgriCo The new three nitrate sites
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Trends
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New sources affected by poor water quality by 2010
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New sources affected by poor water quality by 2015
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Solutions Blend Treat Solve the problem at source – catchment management
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Blending
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Blending
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Ion Exchange
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GAC (at Fovant WTW)
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Catchment management Solves the problem at source
Public water supply and the environment More sustainable Lower cost
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Pesticides Ulwell Friar Waddon
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Ulwell
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Ulwell Location of sheep dip
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Treated Water Quality
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Chlortoluron October/November 2002
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Isoproturon - November 2003
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Metazachlor September 2004
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Friar Waddon Discussions with DWI and farmers Agreement
No spraying pesticides for a 3 year trial Contribute to improving his batching facility Contribute to a weed-wipe system for a neighboring farmer
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Picture of new barn
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Empool Rising nitrate levels
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Sampling, water and soils
Catchment adviser Nikki Downton Empool Nitrates Five year project Work programme Sampling, water and soils Contact with farmers Agronomic advice Farm management plans Modeling
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Results Too early
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Preliminary map of nitrate concentration distribution
EMPOOL CATCHMENT AREA 48 52 42 25 TERTIARY DEPOSITS 87 EMPOOL SOURCE 40 71 < 1 39 56 41 51 36 45 2 km 155
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Three new sites Deans Farm near Salisbury
Winterbourne Abbas, Eagle Lodge near Dorchester New Wessex catchment adviser, who is Harry Wheeler
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Conclusions Catchment management is the best solution to water quality problems To achieve it: Start as soon as possible – to meet drinking water regulation requirements Be site specific Be detailed Involve significant changes to land management Offer something to the farmers
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