Green Buildings - Energy Efficiency in the Urban Environment - page 201

continuously optimise performance. Per the EISA 2007, the utility
meters must also include natural gas and steam, where natural
gas and steam are used.

d. Benchmarking . Compare annual performance data with previous
years' performance data, preferably by entering annual perfor-
mance data into the ENERGY STAR Portfolio Manager. For build-
ing and space types not available in ENERGY STAR, use an
equivalent benchmarking tool such as the Labs21 benchmarking
tool for laboratory buildings.

3. Protect and Conserve Water

a. Indoor water . Two options can be used to measure indoor potable

water use performance:

i. Option 1: Reduce potable water use by 20% compared to a
water baseline calculated for the building. The water base-
line, for buildings with plumbing fixtures installed in 1994
or later, is 120% of the Uniform Plumbing Codes 2012 or
the International Plumbing Codes 2012 fixture performance
requirements. The water baseline for plumbing fixtures older
than 1994 is 160% of the Uniform Plumbing Codes 2012 or
the International Plumbing Codes 2006 fixture performance
requirements.

ii. Option 2: Reduce building measured potable water use by
20% compared to building water use in 2003 or a year there-
after with quality water data.

b. Outdoor water . Three options can be used to measure outdoor
potable water use performance:

i. Option 1: Reduce potable irrigation water use by 50% com-
pared to conventional methods.

ii. Option 2: Reduce building-related potable irrigation water
use by 50% compared to measured irrigation water use in
2003 or a year thereafter with quality water data.

iii. Option 3: Use no potable irrigation water.

c. Measurement of water use . The installation of water meters for
building sites with significant indoor and outdoor water use is
encouraged. If only one meter is installed, reduce potable water
use (indoor and outdoor combined) by at least 20% compared to
building water use in 2003 or a year thereafter with quality water
data. Employ strategies that reduce storm water runoff and dis-
charges of polluted water offsite. Per EISA Section 438, where
redevelopment affects site hydrology, use site planning, design,
construction and maintenance strategies to maintain hydrologic