when doing a storm water study for a subdivision, how do you know when to stop the length of travel for a water course when calculating the time of concentration. If I am able to collect all runoff at a single pond located in the project. Do I use the travel length from the furthest point in the subdivision i.e. accross the lawn, down the gutter, into a catch basin, through the storm drain, and finally into the detention pond where the final outfall is located? Or is the length just to the first catch basin where it is possable for water to back up and become detained because of the restriction plate/orifice being used at the pond outfall. It makes a big difference in the runoff volume when using shorter travel lengths within the sub catch basins of the subdivision. I would appreciate all coments on how other people calculate the travel length. Thanks in advance
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