The Mayor's draft water strategy - london.gov.uk - Greater London ...

3.36 Table 3.3 shows the potential savings in
water usage, water and energy costs and
carbon emissions that can be achieved
through the introduction of various water
saving devices and changes in behaviour.
3.37 The government, in its water strategy
for England Future Water puts forward
a ‘Vision for 2030’ in which per capita
consumption of water is reduced through
cost effective measures, to an average of
130 litres per person per day by 2030, or up
to 120 litres per person depending on new
technological developments and innovation.
But since publication in February 2008, the
government has given no guidance as to
how these standards are to be achieved.
Whilst none of the four water companies
serving London have adopted this as a
planning target in their draft Water Resource
Management Plans, Table 3.3 and experience
Baseline: Standard London house
with high flow mixer shower
Scenario 1 Retrofit: Showerheads,
Taps, Cistern insert
m 3
year
Water
cost
Energy
cost
from other countries such as Australia does
suggest that 130 or 120 litres per person per
day could be achieved by 2030. The Mayor
therefore supports 130 litres per person per
day as a medium-term target for reducing
domestic water consumption.
3.38 Retrofitting London’s 3.2 million existing
homes has become an essential climate
change action for both reducing London’s
carbon emissions and improving our water
efficiency. The London Plan 52 and London
Housing Strategy 53 both contain policies
to improve the environmental performance
of London’s existing housing stock. The
Mayor is working with boroughs and other
partners to develop a successor standard to
the current Decent Homes Standard, which
will include water efficiency objectives for
social housing refurbishment. The Mayor is
also directing a significant share of London’s
Table 3.3 Reduced household water use, cost and carbon emissions through retrofits and behaviour changes
Scenario 2 Behaviour changes:
Replace bath/long shower with
short shower
Scenario 3 Retrofit and behaviour
changes combining Scenarios 1 & 2
Total
cost
Kg CO 2
year
Notes
192 £283* £277 £560 1369 Weekly: 5 showers and 2 baths per
person. 10 litre toilet.
157 £232 £210 £442 1038 Showerhead 11 litres per minute for
7 minutes. tap aerators and Ecobeta
toilet insert
150 £221 £260 £421 988 5 minute shower instead of daily bath
or long shower
107 £158 £148 £306 719 Shower, toilet and tap retrofits.
5 minute showers
• Based on the average Thames Water bill for water and sewerage services in 2008/09.
Calculation based on Energy Saving Trust data.
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