CivilStructural.com.my 25 Aug 2013
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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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