Contingency planning for loss of water supplies

Jim Smith MBCI

Resilience Programme Manager

A reminder…

• Gloucestershire 2007

TewkesburyTewkesbury

CheltenhamCheltenham

GloucesterGloucester

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

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

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

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

Leicester – Melbourne WTW

An overview of plan contents

Area affected

How much water is required

Melbourne - Volume Requirement

0

1000000

2000000

3000000

4000000

5000000

6000000

D-36 D-24 Day 1 Day 2 Day 3 Day 4 Day 5

Period

Lit

res

Deployed via bottles

Deployed via bowsers

Deployed via Tankers withTbars

STW requirement (20L)

Regulatory requirement (10L)

Where to source it from

Where to deploy bowsers

Where to deploy bottled water

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

Supporting vulnerable individuals

• Register of vulnerable customers

• Voluntary registration through our access team

• More information at:www.stwater.co.uk/household

Over the course of a year the average Severn Trent customer

has an uninterrupted water supply for

364 days, 23 hours and 42 minutes