My design firm has been asked by a client of ours to help him with a drainage calculation issue. I am not an engineer, just a CAD designer so I feel a bit over my head here so I just wanted to throw it out to the engineering universe to see if I am stepping in the right direction. We have a 90 acre drainage area going through 2 existing 36" pipes to a ditch, then through 2 more existing 36" pipes to a canal. We are going to connect those two sets of existing pipes with 100 linear feet of 36" HDPE pipes and backfill the ditch. Government agencies are concerned about a negative upstream effect during a 100yr storm event. I guess my main question is can I use HydroCAD to do the calculations to determine if conveyance will be restricted and have a negative upstream impact? Is there anything I should be on the lookout for? Am I in over my head? (Yes)
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