Sewage Piping Systems

Overview

Engineering reference data for Sewage Piping Systems 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

Design Velocity Guidelines

Proper flow velocity in sewage piping systems must be maintained to ensure trouble-free operation:

Minimum Velocities (to prevent settling and sedimentation):

• Horizontal wastewater systems with solids: ≥ 3 ft/sec (0.9 m/s)
• Wastewater systems with organic solids: ≥ 2 ft/sec (0.6 m/s)

Maximum Velocities (to prevent erosion and abrasion):

• High-grit sewage handling systems: ≤ 12 ft/sec (3.6 m/s)
• Low-grit sewage systems: ≤ 18 ft/sec (5.4 m/s)

Flow Capacity Reference Table

Note: Values are based on clean pipes. Friction coefficients may vary with pipe material, which can affect actual flow capacities.

Interactive Charts

References

• Original Source