Drainage fixture units (dfu) и труба подбор

Fixture unit values для plumbing drainage, труба подбор per fixture units, и trap подбор.

drainagefixtureunitsКалькулятор

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.