WAgriCo An Opportunity for Improving Drinking Water Quality Luke de Vial Water Resources Manager Wessex Water
Impact of diffuse pollution Solutions Examples of catchment management Pesticides Empool WAgriCo The new three nitrate sites
Trends
New sources affected by poor water quality by 2010
New sources affected by poor water quality by 2015
Solutions Blend Treat Solve the problem at source – catchment management
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Ion Exchange
GAC (at Fovant WTW)
Catchment management Solves the problem at source Public water supply and the environment More sustainable Lower cost
Pesticides Ulwell Friar Waddon
Ulwell
Ulwell Location of sheep dip
Treated Water Quality
Chlortoluron October/November 2002
Isoproturon - November 2003
Metazachlor September 2004
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
Picture of new barn
Empool Rising nitrate levels
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
Results Too early
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
Three new sites Deans Farm near Salisbury Winterbourne Abbas, Eagle Lodge near Dorchester New Wessex catchment adviser, who is Harry Wheeler
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