Thanks for the input. I was in a teleconference on detention basin design and the presentor specifically stated that 5-15 min. inlet concentration times could be added to the time of concentration. I had not ever heard that before and it seems like is it not a reasonable assumption.
I have been told that the time of concentration can be lengthened by 5-15 min. when storm water is routed through a catch basin. I have not been able to find any technical data discussing this and was wondering if anyone has information on this subject.
