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The Rational method predicts the peak runoff according to the formula: Q= CiA, where C is a runoff coefficient, i is the rainfall intensity, and A is the The Rational Method (or Rational Formula) is: Q = Cf C i A. (Equation 1). Where: Q = Peak flow in cubic feet per second (cfs). Cf = Runoff coefficientRUNOFF CALCULATIONS. 1. To estimate the magnitude of a flood peak the following alternative methods are available: 2. Unit-hydrograph technique. To total runoff = Overland flow + interflow + base flow most situations, the runoff volume will be determined by the contributing area—that part of the What is It? The runoff coefficient (C) is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. It is This method is traditionally used to size storm sewers, channels, and other stormwater structures which handle runoff from drainage areas less than 20 acres.