Estimating
GPM Flow
For the Estimating of Flow Rates and Water Usage Most types of fixtures and uses are listed in this publication to permit the estimating of the probable gallon per minute demand in residential, public buildings, motels and hotels, office, schools, shopping centers, and other customers. The following information which the AWWA assembled in the estimating of flows, is also in part, data that has been published from the National Bureau of Standards, using plumbing manual report BMS-66. This method includes a list of fixtures and a table of values for each fixture, as well as a value for the fixture if it is in public use.
Plumbing Fixtures Values The following represents each individual fixture value as if each fixture was operated independently at 35 PSI inlet pressure. A bathtub for example flows at a rate of 8 GPM without any interference from other fixtures. As more fixtures are present, the probability of flow decreases. When encountering devices or fixtures not listed, the demand in gallons per minute should be determined and added to the total fixture count.
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