Rational method: peak runoff
Set the rainfall intensity, catchment area and surface type to see the peak runoff.
Works in metric or imperial units.
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Questions students ask
What is the time of concentration?
The time for rain on the furthest point of the catchment to reach the outlet. Use a storm of that length for the intensity.
What formula does it use?
Q = CiA/360 (Q in m³/s, i in mm/h, A in hectares).
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