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MANAGING WATER RESOURCES IN A CHANGING CLIMATE Rod Wilkinson

MANAGING WATER RESOURCES IN A CHANGING CLIMATE Rod Wilkinson Principal Hydrologist and Water Resources Planner. Severn Trent Water Ltd - some basic statistics ….. 7 million customers supply 9 English counties and Powys Average daily supply = 1988 Ml/d

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MANAGING WATER RESOURCES IN A CHANGING CLIMATE Rod Wilkinson

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  1. MANAGING WATER RESOURCES IN A CHANGING CLIMATE Rod Wilkinson Principal Hydrologist and Water Resources Planner

  2. Severn Trent Water Ltd - some basic statistics ….. • 7 million customers • supply 9 English counties and Powys • Average daily supply = 1988 Ml/d • sources are split equally between reservoirs, rivers and groundwater • unaccounted for water approximately 500 Ml/d

  3. Managing water supply - relevant legislation Sect 37 A (8) Water Industry Act 1991 Environment Agency Water Resources Planning Guideline April 2007 And climate change … Supplementary Guideline NWA/NSR v5 Impact of Climate Change on river flow and groundwater recharge. UKWIR CL04, UKWIR06 and Supplementary Spreadsheet v2.2

  4. 1. Oswestry 2. Staffs & E Shrops 3. Severn 4. Birmingham 5. Forest & Stroud 6. East Midlands Severn Trent Water Water Resource Zones SSWC

  5. Chesterfield Bamford Ogston Sherwood Higham Homesford Notts GW Ambergate SR The Strategic Grid L Eaton Nottingham Derby C Wilne Melbourne Ragdale SR Hallgates Cropston Leicester Trimpley S Shrops BIRMINGHAM Whitacre Nuneaton Frankley Oldbury SR Elan Aqueduct Coventry Meriden SR Rugby E Worcs Elbury Worcester Draycote Warwick/L'ton Stratford Campion Hills Strensham Mythe Forest of Dean Gloucester Mitcheldean

  6. The Planning process • Company business plan every 5 years • next one due in 2009 • Water Resources Plan forms part of this • submitted to DEFRA and Welsh Assembly Government • regulated by OFWAT

  7. The issues • rising demand • loss of resources – water quality (eg nitrates) • loss of resources - Water Framework Directive sustainability reductions • climate change (more variability in runoff, more seasonality, higher peak demands) • level of service is not more than 3 hosepipe bans per century

  8. Example of a Supply – Demand Balance The East Midlands

  9. Losses due to climate change in 2004 Water resources Plan

  10. Possible options • supply side - new sources (increased licensing) and raw water storage • demand side - water efficiency plus greater leakage reduction

  11. Thank you

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