Note: An explanation of the four St. Venant Terms in SWMM 5 and how they change for Force Mains. The HGL is the water surface elevation in the upstream and downstream nodes of the link. The HGL for a full link goes from the pipe crown elevation up
The Three Flows in SWMM 5 for a Link
There are actually three flows computed or used for a link in SWMM 5:
1. The St. Venant Flow equation flow
2. The Upstream Normal Flow Manning's equation based on the link roughness, slope, upstream cross sectional area and upstream … Read the rest
Subject: What are the Units for the five St. Venant Flow Terms in SWMM 5 and InfoSWMM?
The new flow (Q) calculated at during each iteration of time step as
(1) Q for the new iteration = (Q at the Old Time Step – DQ2 + DQ3 + … Read the rest