1 March 1997
support the useful storage, to provide a source of emergency water supply, and must be pumped into the
d. Elevated storage. Elevated storage tanks should be located in the areas having the lowest system
pressures during intervals of high water use to be effective in maintaining adequate system pressures and
flows during periods of peak water demand. These are those of greatest water demand or those farthest
from pump stations. Elevated tanks are generally located at some distance from the pump station(s)
serving a distribution pressure level, but not outside the boundaries of the service area, unless the facility
can be placed on a nearby hill. Additional considerations for siting of elevated storage are conditions of
terrain, suitability of subsurface soil and/or rock for foundation purposes, and hazards to low-flying aircraft.
Elevated tanks are built on the highest available ground, up to static pressures of 520 kPa (75 psi) in the
system, so as to minimize the required construction cost and heights.