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

use on their premises. For example, the
Environment Agency has set itself a target
of 5.1 m 3 per full time employee per year
for 2006/07. In the GLA, non-potable water
from a borehole cools City Hall, London, and
then diverts into the toilet cisterns. Hence
the potable water use in City Hall is low.
3.43 Non-domestic or commercial water use
is divided into non-service and service
sectors 54 . Commercial water use for
Thames Water’s London resource zone
for 2006/07 is estimated to be 412 Ml/d,
with 82 per cent attributed to the services
sectors and 18 per cent to non-services.
Leakage from commercial supply pipes
was some 1.5 per cent of total commercial
water delivered. Thames Water estimates
that whilst overall commercial demand
will grow over the next 25 years by some
eight per cent, the non-service sector’s
demand will reduce by 32 per cent. This
will be offset by an increase of 18 per cent
from the services sector.
Figure 3.3 The components of non-household water consumption
3.44 Commercial water efficiency therefore has
a significant potential to save water, for
example buildings with high occupancy
rates, such as schools, hotels and office
blocks, could replace urinals with waterless
varieties, making significant savings (a
standard urinal can use around six to ten
litres of water every flush). Thames Water’s
‘Liquid Assets’ project has shown significant
saving from water efficiency in commerce.
The project, launched in September 2006,
embarked on a water audit programme
for the public sector, with over 240 public
sector sites (ranging from primary schools to
sports centres) participating in a water audit
that identified potential leaks and made
recommendations on how to reduce water
consumption. In addition, Thames Water
provided funding for some sites to install
recommended water efficient technologies.
Over 4,300 measures have been funded and
installed, including new urinal controls, push
taps and cistern devices with reported saving
in the region of 500,000 litres per day.
Other services 45.9%
Agriculture, horticulture, forestry and fishing 1.4%
Hotels, bars and restaurants 16.0%
Wholesale and retail 6.1%
Education and health 17.6%
Other manufacturing 3.1%
Transport and manufacture of transport equipment 3.3%
Food and drink manufacture 6.6%
53