Commercial/Industrial Use. These uses include, but are
not limited to, cooling, processing, flushing, swimming pools,
shops, laundries, dining facilities, air conditioning, and boiler
makeup. Water requirements listed in Table 18 should be used
unless actual measurements justify a revision. The following is
a description of the various commercial and industrial uses:
expressed in gallons per minute per ton for air conditioning
units. Non-tower type air conditioning and refrigeration should
be spot measured to estimate usage levels.
b) Machinery Cooling Usage: Water usage for machine
cooling is expressed in gallons per minute of operation per brake
horsepower and depends on the type of machinery. The usage for
c) Swimming Pools: Table gives daily water usage in
gallons of make-up water (due to evaporation and leaks) to
gallons of pool capacity. Maximum values should be used in
desert type environments.
d) Vehicle Washing: Water usage for equipment washing
is expressed in gallons for each piece of equipment washed during
a day. These averages are based on equipment size and frequency
of washing. Monthly usage, estimated in gallons, for Government
and private cars, trucks, and buses are 50, 100, and 250 gallons,
respectively. Other uses, such as automatic car washing
facilities, should be determined based on experience and past
consumption. If private car washing facilities are provided for
privately-owned vehicles, determine the number of private cars
owned by full population and adjust usage as necessary.
e) Irrigation and Lawn Sprinkling: The average
monthly water usage is based on temperature, sunlight, rainfall,
and soil type. Maximum values should be used in desert type
environments. Units in Table 18 are gallons per acre day (gpad).
f) Other: Estimates for laundries (units are gallons
of water per pound of clothes cleaned) and restaurants (units are
in gallons per meal served) are given in Table 18.