Hydraflow Storm Sewers can not properly handle drop manholes (plunging flow) due to the fact it only uses the FHWA Approximate Method. The StormCAD result is shown in images further below:
200 cfs, 60" pipes @ 1% slope, supercritical flow:
Hydraflow Storm Sewers:
Also note zero values for depth, area and velocity head in Hydraflow Storm Sewers:
StormCAD:
StormCAD offers HGL In/Out for the structures as shown below:
Fred Ernst, PE
C3D 2024
Ernst Engineering
www.ernstengineering.com