Question

Which of the following formulae correctly represents the Rational Equation? What does the Rational Equation calculate?

A. Dd = ∑L/A; drainage density

B. Q = AV; stream discharge

C. V = [1.49(R^2/3 x S^1/2)]/n ; velocity of streamflow during flood stage

D. Q = 1.366 x [h x h x (h/2)]); the discharge through a flume

Q = KiA; peak runoff over a surface

Answer 1

The rational equation is used to calculate peak runoff over a surface. And is given by Q= KiA

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Rational Equation Calculation, Q=ciA. The Rational equation is the simplest method to determine peak discharge from drainage basin runoff. ... The duration is usually equivalent to the time of concentration of the drainage area.