I wanted to type the individual drainage areas in so that Storm Sewers would calculate the flows in each pipe, but I could not find a way to change the default values for runoff coefficients. The program wants to use 0.9 for impervious and 0.5 for landscape. How to use different values?
Instead, I calculated the pipe flows in Excel and then typed them into the Pipe Properties for each individual pipe, before exporting to Storm Sewers. This worked ok but would be better if I could eliminate this step.
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