In my model, I run the analysis of the storm sewer design and there are unexplained jumps in the peak flow rates. I checked the subbasin information that I input and the external inflows to make sure that I did not input any other flows. The total peak flow in the model from all the subbasins combined is around 8 cfs and the model gives me 134 cfs at the outfall. Please, can some one explain why those jumps in peak flow rates occur?
Thanks,
Mike
Yes, the reason those jumps in peak flow rate were occuring in my model was because I had a a 5ft bench at my outfall structure. When I dropped the bench to about 1 ft, the peak flow rates dopped and gave a me a more reasonable answer. Its not ideally the best solution but you have to lie to the system in a way to get it to display the flowrates you want. Just make sure you dont bench your structures if thats the case in your model.