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BEAM P
LUS
I
NTERIORS
C
OMMERCIAL
, R
ETAIL
A
ND
I
NSTITUTIONAL
A
PPENDICES
9.3 A
SSUMPTIONS AND
B
ASELINES FOR
W
ATER
C
ONSUMPTION
Copyright © BEAM Society Limited. All rights reserved. Page 138
9.3 A
SSUMPTIONS AND
B
ASELINES FOR
W
ATER
C
ONSUMPTION
The following details the default assumptions for the calculation of the
reduction in water use of the project building when compared with an
equivalent baseline space.
N
UMBER OF
W
ORKING
OR
O
PERATIONAL
D
AYS
The number of operational days per annum (Nop) should be obtained
from the OPR.
The number of non-operational days is equal to 365 - Nop. The same
value for operational and non-operational days shall be used for both
the baseline space and project space.
O
CCUPANCY
C
ONSIDERATIONS
The number of occupants shall be taken from the OPR. If the data is
not obtainable then, in the absence of any other data, the occupant
space allowance should be taken as 9m
2
/person.
[1]
The male to female ratio should be also determined from the OPR. If
the data is not available then the default assumptions shall refer to the
latest version of PNAP ADV-28 [
2].
The same occupancy load shall be applied to the baseline case and
as-built case.
W
ATER
F
LOW
R
ATE
C
ONSIDERATIONS
Where installed, water conservation fixtures and appliances shall
deliver no more than declared water flow rate, irrespective of the
working pressure.
For example, where the submission material indicates the as-built
case for shower, providing 8 litres/min @ 100 Kpa, the Applicant shall
demonstrate that the working pressure by calculation does not exceed
100 Kpa. In this case, if the actual working pressure was 150 Kpa then
the flow rate would exceed the declared flow rate.
H
AND
W
ASHING IN
R
EST
R
OOMS
i.
operations per occupant per day shall be five (5);
ii.
duration of use shall be ten (10) seconds;
iii.
baseline flow rate is indicated in the table;
iv.
to obtain significant savings, automatic control, such as
proximity sensors, would reduce the tap operation time to less
than the default ten (10) seconds per operation;
W
ATER
U
SE IN
P
ANTRIES
/ K
ITCHEN
i.
pantry tap operations per occupant per day shall be 1.
ii.
Utensil washing operation carried out by hand shall be 6 litres
of water per operation;
iii.
duration of use shall be fifteen (15) seconds
iv.
baseline flow rate is indicated in the table;
S
HOWERS
i.
operations per occupant per day shall be 0.1
ii.
duration of use shall be 6 minutes (360 seconds);
iii.
baseline flow rate is indicated in the table;
O
THER
A
PPLIANCES
/
E
QUIPMENT
If the baseline for other fixtures and equipment is not listed in this
Manual the Applicant shall based it upon reference to regulations,
standards, guides and other publication published by relevant
authorities, and justification for each instance provided.
1
Buildings Department (2011), Code of Practice for Fire Safety in Buildings.
2
Buildings Department. Practice Note for Authorized Persons, Registered Structural Engineers and Registered
Geotechnical Engineers. PNAP No. ADV-28 Provision of Sanitary Fitments in Offices, Shopping Arcades,
Department Stores, Places of Public Entertainment, Cinemas and Other Public Places.