Subject:   SWMM 5 Inlet Control Culvert Equations

The newer option for SWMM 5 culverts uses three culvert classifications and associated equations to compute the inletcontrolled flow into a culvert using the FHWA (1985) equations.  The culvert code in the culvert.c code of SWMM 5 uses:

1.   Two Equations for Unsubmerged culvert flow,

2.   One Equation for the Transition flow, and

3.   One Equation for Submerged flow.

via Blogger http://www.swmm5.net/2013/08/swmm-5-inlet-control-culvert-equations.html