Hello,

I am using SWMM to model an area of 30 acre with a few ditches running through. I have collected flowrate measurements at those ditches and the corresponding precipitation records. During simulation, the time of peak flowrate I calculated is off 2-3 hours in a storm of 10 hours. And I was unable to change the peak time by adjusting the parameters in subcatchments. I wonder what parameters would affect the peak time significantly? I would appreciate any help from you.

Thanks,
Jason Chin-Cheng Sun, Ph.D.
jsun@sspa.com