I am designing an underground detention system consisting of 3 x 1131LF 60 inch pipes. The reviewer is asking for a profile of the HGL in the pipes with each inlet into the UGD (see his requirements/questions below).
My question is that profiling the detention pipes accounting for inlets/lateral flows doesn't seem realistic. If this was a surface pond the max WSE would be used as the downstream for each of the laterals. Is there a printout I can provide to him that would answer his concerns? Per his comment #3, isn't the underground detention already modeled as a pipe hydraulic element since the model has the pipe size, slope, and tailwater information?