4.
WATER SUPPLY:
4.1
Flow: If meter readings are not available, average domestic daily
flow shall be determined using 1140 L (300 gallons) per day per
bed and laundry daily flow shall be based on 21 L/kg (2.5 gallons)
per pound of laundry. Daily fire demand shall be 340 kL (90,000
gallons). Average domestic demand in L/S (GPM) is determined by
assuming 80% of the average domestic daily flow occurs in 16 hours
(divide average domestic daily flow by 1200).
4.2
Sources: A connection to a public water company is preferred for
the site. Two connection points are required with valving so that
in the event of breakage in a portion of the supply, adequate
water would still be available. If possible, supply the site from
two different directions. If a public water supply is not
possible, propose an alternate solution.
4.3
On-Site Storage: Provide storage, except for roof storage, and/or
pumping system if the water source (public, well, etc.) cannot
meet the either of the following requirements:
A.
Fire Protection: On-site water distribution system shall
provide 5670 L/min at 138 kPa (1500 GPM at 20 pounds per
square inch) residual pressure.
B.
Domestic Uses: On-site water distribution system shall
provide 150 percent of the average domestic demand L/S (GPM)
at a minimum residual pressure of 345 kPa (50 PSI). However,
if adequate pressure to serve the highest user is not
possible, building booster pumps may be used in lieu of
pumping the entire distribution system (See Article, DOMESTIC
WATER PUMPING SYSTEM).
4.4
Exceptions: When most of the following unfavorable conditions
occur, daily fire demand shall be 680 kL (180,000 gallons) and on-
site water distribution system shall provide 11340 L/min at 138
kPa (3000 GPM at 20 PSI) residual pressure for fire protection:
A.
Buildings housing patients are not completely sprinklered.
B.
Combustible construction.
C.
Moderate or serious fire exposures.
D.
Hindrance to fire department apparatus access to building
site.
E.
Delayed response by inadequately staffed fire department.
5.
WATER DISTRIBUTION SYSTEM:
5.1
Design system to provide adequate water service for maximum
domestic and fire protection requirements. Incorporate grid
systems as far as practical. Buildings housing patients shall be
looped by a water main with fire hydrants. No water main shall be
smaller than 300 mm (8 inch) diameter and no fire hydrant branch
less than 150 mm (6 inch) diameter. Flow velocity shall not
exceed 3 m/s (10 feet per second).
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