What are the Types of Force Mains (FM) in SWMM 5?
Subject: What are the Types of Force Mains ( FM ) in SWMM 5 ? There are five ways to model a force main in SWMM 5 for the combination of full and partial flow in the force main (Figure 1): 1. Full Flow using Darcy-Weisbach for the friction loss 2. Full Flow using Hazen-Williams for the friction loss 3. Full Flow using Manning's n for the friction loss 4. Partial Flow uses Manning's n for the friction loss for Force Main Equation options If you use Darcy-Weisbach or Hazen-Williams then an equivalent Manning's n for a force main that results in the same normal flow value for a force main flowing full under fully turbulent conditions is calculated internally in SWMM 5 in forcemain.c ...