Have you heard about HydroCAD ? This is an excellent way for calculation the runoff, I know calculating runoff correctly is the key factor for the water balance study. I suggest you to read about HydroCAD and try to use it. The link for the calculator is http://www.hydrocad.net/runoff.htm they use rational method, you must try.

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Have you heard about HydroCAD ? This is an excellent way for calculation the runoff, I know calculating runoff correctly is the key factor for the water balance study. I suggest you to read about HydroCAD and try to use it. The link for the calculator is http://www.hydrocad.net/runoff.htm they use rational method, you must try.