CHAPTER 3
DETERMINATION OF CAPACITY REQUIREMENTS
water in storage below the fire demand
3-1. Total Storage Requirements
quantity. Water storage greater than the
The amount of water storage provided will con-
amount determined by the largest of
form to the requirements set forth herein. Request
Items 1, 2, or 3 may be required because
for waivers to depart from these requirements will
of appropriate adjustments for emergency
be forwarded to HQDA (DAEN-ECE-G) WASH DC
water quantity or other applicable factors;
20314 for Army projects and to HQ USAF/LEEEU
however, this must be substantiated by
WASH DC 20332 for Air Force projects.
actual data on a repeated annual basis
a. All military installations. In general, total
documenting the low storage levels occur-
storage capacity, including elevated and ground
ring during normal peak demand.
storage, will be provided in an amount not less
Item 3: The sum of Items 1 and 2
than the greatest of the following items (para. 3-
above, that is, the sum of fifty percent of
2).
the average total daily domestic require-
Item 1: Fifty percent of the average
ments, all industrial requirements for an
total daily domestic requirements plus all
average day which cannot be shut off
industrial requirements. This will provide
during emergency conditions, and the re-
minimum operational storage needed to
quired fire demand. The sum of the above
balance average daily peak demands on
items will be reduced by the amount of
the system and to provide an emergency
water available in 24 hours under emer-
supply to accommodate essential water
gency conditions. This will provide maxi-
needs during minor supply outages of up
mum storage where emergency water
to a one-day duration. For the purposes of
supply is a minimum over a 24-hour
this item, essential water needs do not in-
period or a supply main outage would sig-
clude the fire demand.
nificantly affect overall supply conditions.
Item 2: The fire demand. The fire
The most economical alternative for meet-
demand is the required fire flow needed to
ing the water storage requirements will
fight a fire in the facility (including water
be selected in all cases. Installation of ad-
required to support fire suppression sys-
ditional emergency pumping facilities, ad-
tems) which constitutes the largest re-
ditional water supply connections, drilling
quirement for any facility served by the
additional wells or other modifications to
water supply system (calculated IAW TM
the water system which will be more cost
5-813-6/AFM 88-10, Vol. 6); plus 50 per-
effective than increasing storage capacity
cent of the average domestic demand rate
will be developed.
plus any industrial or other demand that
b. Special considerations. The amount of storage
cannot be reduced during a fire period.
required for plant and special projects will be
This amount will be reduced by the
based on industrial, domestic, and fire-protection
amount of water available under emer-
requirements. Each project will be considered on
gency conditions during the period of the
the basis of specific need. Hospital storage facili-
fire (TM 5-813-l/AFM 88-10, Vol. 1).
ties will be designed in accordance with the latest
edition of the Joint Commission Accreditation
NOTE
Manual for Hospitals, American Hospital Associa-
The fire demand quantity must be main-
tion.
tained in storage for fire protection at all
c. Amount of water available under emergency
times except following a fire fighting opera-
conditions.
tion when the fire demand quantity would
(1) The amount of water available under emer-
be depleted. It is recognized that during
gency conditions is considered to be that available
daily periods of peak consumption due to
from auxiliary-powered pumps during electric-cur-
seasonal demands, the amount of water in
rent outage, from electric-motor-driven pumps
storage will be less than full storage ca-
with the largest pump out of service, from one or
pacity; however, conservation methods
more supply mains with the main of greatest ca-
will be instituted to prevent drawdown of
3-1
Previous Page
