Building drains sewers fixture units slope

Overview

Engineering reference data for Building Drains Sewers Fixture Units Slope in sanitary drainage.

Key Formulas

Manning's Equation

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

Open channel flow.

Slope

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

Hydraulic gradient.

Variables

Symbol	Description	Unit
$Q$	Flow rate	m³/s
$n$	Manning roughness	—
$A$	Flow area	m²
$R_h$	Hydraulic radius	m

References

• Original Source