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BEAM P
LUS FOR
N
EW
B
UILDINGS
A
PPENDICES
V
ERSION
1.2
8.6 A
SSUMPTIONS AND
B
ASELINES FOR
W
ATER
C
ONSUMPTION
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A - 23
flushed after every use. Each male employees use the urinal on average
four (4) times per day.
The water use in the project building would be based on the same
number of male employees each using the urinals four (4) times per day.
The calculation shall consider the actual flushing strategy employed.
An estimate of the potential water savings is not able to be determined
as it would be influenced by the number of male employees and the time
interval of flushing.
H
AND
W
ASHING IN
R
EST
R
OOMS
Number of hand wash operations per occupant per day = 5
Hand washing time = 10 seconds
For the baseline building, the tap flow rate is 8.3 litres/min [4]
Note that to obtain significant savings the project space would need to
install automatic controls such as proximity sensors to reduce the tap
operation time to less than the default assumption of 10 seconds per
hand washing operation.
W
ATER
U
SE IN
P
ANTRIES
/
KITCHEN
For non-residential,
Number of pantry tap operations per occupant per day = 1
Baseline faucet flow rate = 8.3 litres/min
[4]
Duration of use = 15 seconds
Utensil washing operation carried out by hand = 6 litres of water per
operation
For residential,
Number of use per resident per day = 4
Baseline faucet flow rate = 8.3 litres/min [4]
Duration of use = 60 seconds
S
HOWERS
Number of use of shower per occupant per day = 0.1 (for non-
residential)
Number of use of shower per resident per day = 1 (for residential)
The baseline shower flow rate = 9.5 litres/min
[4]
Shower duration = 5 minutes (300 seconds)
O
THER
A
PPLIANCES
/
E
QUIPMENT
Justification for capacities of appliance/equipment used in the
benchmark building shall be provided by making reference to
regulations, standards, guides and other publication published by various
authorities.
4
USGBC, LEED 2009 for New Construction and Major Renovations Project