Contingency planning for loss of water supplies

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Contingency planning for loss of water supplies

• Jim Smith MBCIResilience Programme Manager

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A reminder

• Gloucestershire 2007

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Tewkesbury
Cheltenham
Gloucester
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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
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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

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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

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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

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Leicester Melbourne WTW
An overview of plan contents
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Area affected
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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
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Where to source it from
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Where to deploy bowsers
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Where to deploy bottled water
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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

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Supporting vulnerable individuals

• Register of vulnerable customers
• Voluntary registration through our access team
• More information atwww.stwater.co.uk/household

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Over the course of a year the average Severn
Trent customer has an uninterrupted water supply
for 364 days, 23 hours and 42 minutes