25 Aug 2013

C & S Software Solutions Sdn Bhd  


Civil and Structural Engineering

Modified Rational Method Equation Calculator

New  Q=Cs*C*i*A

Q=peak discharge in cubic feet per second of return period T years
i=average intensity of rainfall in inches per hour for a duration equal to the time of concentration tc, and a return period T years.
A=catchment area in acres.
C=runoff coefficient
Cs=storage coefficient

Cs= C= i= A=
Q= ft^3/s

(Updated 15/5/07)
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