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Contingency planning for loss of water supplies

Learn about the contingency plans and actions taken during the water supply loss incident in Gloucestershire in 2007. Understand the measures undertaken to restore supplies and prevent future occurrences. Essential information for water suppliers and communities.

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Contingency planning for loss of water supplies

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  1. Contingency planning for loss of water supplies Jim Smith MBCIResilience Programme Manager

  2. A reminder… • Gloucestershire 2007

  3. Tewkesbury Cheltenham Gloucester

  4. Timeline • Sun 22nd July: Mythe works shut down • Tue 24th July: 140,000 properties without supply • Fri 27th July: Non drinking water supply restored to 10,000 properties • Thu 2nd August: Non drinking water supply restored to entire area • Fri 3rd August: Moved from do not drink to boil water notice • Tue 7th August: Safe to drink notice issued A total of 17 days between the works being shut down and supplies being fully restored

  5. Facts and figures Bottled water: • 150,000 litres supplied 23 July • 3m litres a day available by end 24 July • 15 local distribution centres • 5m litres available at peak Bowsers & tankers: • Over 90 tankers • 1,100 bowsers deployed • Largest number ever used in a single incident in the UK • Average three fills a day • 23,000 water quality tests

  6. How to stop it happening again • Improvements at 6 Water Treatment Works and 73 Borehole Sources based on EA National Flood Risk Assessment • Investment in strengthening the strategic grid • Creation of Alternative Supplies plans

  7. Alternative Supplies plans • 6 sites identified as a single source of supply • Comprehensive plans produced to provide alternative supplies to these areas • Regulatory minimum of 10 litres per head per day, our plans are based around providing 20 litres

  8. Leicester – Melbourne WTW An overview of plan contents

  9. Area affected

  10. How much water is required Melbourne - Volume Requirement 6000000 Deployed via bottles 5000000 4000000 Deployed via bowsers Litres 3000000 Deployed via Tankers with 2000000 Tbars STW requirement (20L) 1000000 0 Regulatory requirement (10L) D-36 D-24 Day 1 Day 2 Day 3 Day 4 Day 5 Period

  11. Where to source it from

  12. Where to deploy bowsers

  13. Where to deploy bottled water

  14. Supporting vulnerable premises • Creation of contingency plans with hospitals and prisons • Tanker resources factored into plans for these sites • Other types of vulnerable premises identified • Provision via bottled water or bowsers

  15. Supporting vulnerable individuals • Register of vulnerable customers • Voluntary registration through our access team • More information at:www.stwater.co.uk/household

  16. Over the course of a year the average Severn Trent customer has an uninterrupted water supply for364 days, 23 hours and 42 minutes

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