Drainage fixture units (dfu) と配管選定

Fixture unit values for plumbing drainage, 配管選定 per fixture units, と trap 選定.

drainagefixtureunits計算機

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.