I have created a model of a city wide sewer system for a client of ours over the past several months. It is now complete and we are testing it by manually adding small inflows (250 gpm) around the system. The process I am using is to add one 250 gpm inflow at a single MH and then run the Analysis and check for issues. I then remove that inflow and place another at the nest test location and repeat. The issue I am having is that the last several iterations of this method have resulted in an unexplained increases in the flowrate downstream. I only place one 250 gpm at a single MH but at some point down the line the peak flow will increase, sometimes to over 7000 gpm and then it goes back to normal after that section. It appears to start at an unspecified point where the flow will begin to increase (say to 315) and then it grows from one MH to the next (750, 1200, 2000...) over a length of the system. Could anyone explain where this extra inflow could be coming from if the only external inflow I have in the entire system is the one 250 gpm that I added?
