CEMP-E
TI 814-01
3 August 1998
CHAPTER 2
WATER REQUIREMENTS
2-1. DOMESTIC REQUIREMENTS. The per-capita allowances, given in table 2-1, will be
used in determining domestic water requirements. These allowances do NOT include special
purpose water uses, such as industrial, aircraft-wash, air-conditioning, irrigation, or extra water
demands at desert stations.
2-2. FIRE-FLOW REQUIREMENTS. The system must be capable of supplying the fire flow
specified plus any other demand that cannot be reduced during the fire period at the required
residual pressure and for the required duration. The requirements of each system must be
analyzed to determine whether the capacity of the system is fixed by the domestic
requirements, by the fire demands, or by a combination of both. Where fire-flow demands are
relatively high, or required for long duration, and population and/or industrial use is relatively
low, the total required capacity will be determined by the prevailing fire demand. In some
exceptional cases, this may warrant consideration of a special water system for fire purposes,
separate, in part or in whole, from the domestic system. However, such separate systems will
be appropriate only under exceptional circumstances and, in general, are to be avoided.
2-3. IRRIGATION. The allowances indicated in table 2-1 include water for limited watering or
planted and grassed areas. However, these allowances do not include major lawn or other
irrigation uses. Lawn irrigation provisions for facilities, such as family quarters and temporary
structures, in all regions will be limited to hose bibs on the outside of buildings and risers for
hose connections. Where substantial irrigation is deemed necessary and water is available,
underground sprinkler systems may be considered. In general, such systems should receive
consideration only in arid or semiarid areas where rainfall is less than about 635 mm (25 in)
annually. For Army Projects, all proposed installations require specific authorization from
HQDA (DAEN- ECE-G), WASH, DC 20314. For Air Force projects, refer to AFM 88-15 . Each
project proposed must include thorough justification, detailed plans of connection to water
source, estimated cost and a statement as to the adequacy of the water supply to support the
irrigation system. The use of underground sprinkler systems will be limited as follows:
Air Force Projects - Areas adjacent to hospitals, chapels, clubs, headquarters
and administration buildings, and
Army Projects - Areas adjacent to hospitals, chapels, clubs, headquarters and
administration buildings, athletic fields, parade grounds, EM barracks, BOQ's, and other areas
involving improved vegetative plantings which require frequent irrigation to maintain
satisfactory growth.
a. Backflow prevention. Backflow prevention devices, such as a vacuum breaker or an
air gap, will be provided for all irrigation systems connected to potable water systems.
Installation of backflow preventers will be in accordance with AFM 85-21(for Air Force facilities)
and the National Association of Plumbing- Heating-Cooling Contractors (NAPHCC) "National
Standard Plumbing Code." Single or multiple check valves are not acceptable backflow
2-1
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