Subject: What are the Equations for Weirs in SWMM 5?
There are four types of Weirs in SWMM 5: Transverse, Sideflow, V Notch and Trapezoidal. The trapezoidal weir is a combination of the Sideflow and V Notch Weir and the Sideflow acts like a Transverse Weir when the flow is reversed (Figure 1)
Figure 1. Weir Equations in SWMM 5
