Drainage Fixture Units (DFU) and Pipe Sizing

Fixture unit values for plumbing drainage, pipe sizing per fixture units, and trap sizing.

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Overview

Engineering reference data for Drainage Fixture Units (DFU) and Pipe Sizing in sanitary drainage.

$Q = \frac{1}{n} A R_h^{2/3} S^{1/2}$

Open channel flow.

$S = \frac{\Delta h}{L}$

Hydraulic gradient.