Runoff Rational & Steel Formula Calculator Units
Blocks shown as light blue are editable
duration of rain t = hr
drainage area A =
percentage of rain as direct runoff C = %
Table 1.0, Coefficient b = -
Table 1.0, Coefficient K = -
Eq. 3, rainfall intensity I =
Calculated Results
Eq. 1, peak discharge Q =
Eq. 1, peak discharge Q =
Eq. 1, peak discharge Q =