Siphon Modeling in InfoSewer and Arc Map
Here is at typical view of a siphon in InfoSewer, the rising links have a d/D of 1 and the dropping links typically have a d/D value less than 1. The q/Q for the rising links is based on the slope and the dropping links typically have a q/Q less than 1 as the full flow is high due to the steep slopes. You can show both the d/D and q/Q values in an Arc Map Display by using the following code. I find it easier to first plot one variable using the InfoSewer Map Display followed by editing the TOC Properties for Pipes to show more than one variable at a time in the Label properties.
Function FindLabel ([D_OVER_D], [Q_OVER_Q] )
If IsNull([D_OVER_D]) then Exit Function
FindLabel ="" & FormatNumber([D_OVER_D],3) & " d/D " & "" & FormatNumber([Q_OVER_Q],3) & " q/Q"
via Blogger http://www.swmm5.net/2013/08/siphon-modeling-in-infosewer-and-arc.html