Fixture Units not listed in Table 709.1Fixture-Unit Values are UpCodesDrainage Fixture Unit Values.

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The Uniform Plumbing Code (UPC) can be used to determine required drainage capacities from fixture and service systems.

A fixture unit is a design factor based on the rate of discharge, time of operation and use of the fixture.A fixture unit is equal to one square foot of water drained in one minute.

If we want a realistic estimate of the total drainage load, we need to compensate for intermittent use of all the fixtures.

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