hydraulically designed

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hydraulically designed (sprinkler) system

A sprinkler system in which the pipe sizes are calculated on the basis of the pressure loss to provide a prescribed number of gallons of water per square foot (liters per minute per square meter) of floor area, or flow per sprinkler, with a reasonable degree of uniformity over the area.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.