Rational method correlates
a. run off coefficient with intensity of rainfall
b. run off coefficient with drainage area
c. drainage area with intensity of rainfall d. intensity of rainfall with run off
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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 subcatchment area. This formula is applicable to US or metric evaluation, as long as consistent units are employed.
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