排水 fixture units (dfu) 与管道选型

Fixture 单位 values 用于 plumbing 排水, 管道选型 per fixture units, 与 trap 选型.

drainagefixtureunits计算器

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.