Rational Method Hydrologic Calculations with Excel Harlan H. Bengtson, PhD, P.E. COURSE CONTENT 1. Introduction Calculation of peak storm water runoff rate ...
C = Rational Method runoff coefficient I = rainfall intensity (inches per hour) A = drainage area (acres) D = storm duration (hours) ...
Rational Method Equation: Based upon the Rational Method Equation: Q = C x I x A x APF Where: Q = The Quantity Flow Rate in CFS C = Dimensionless Runoff Coefficient ... Down
Rational Method Equation: Based upon the Rational Method Equation: Q = C x I x A x APF Where: Q = The Quantity Flow Rate in CFS C = Dimensionless Runoff Coefficientnjscdea.ncdea.org/The Modified Rational Method.pdf
Runoff Examples A. Rational Method Example ... of the surface areas and associated Rational coefficients for the site is provided in ... The example calculation for T cwww.iowasudas.org/manuals/design/Chapter02/2B-6.pdf
Recommended Runoff Coefficient Values for Rational Method Runoff Coefficient (C) ... Knox County policies regarding the calculation of t c are as follows:www.knoxcounty.org/stormwater/pdfs/vol2/3-1-3 Rational Method.pdf
Chapter 4—Drainage Section 4A-5—Using the Rational Method to Determine Peak Flow Page 3 of 10 Table 1: Runoff coefficients for the Rational Method.www.iowadot.gov/design/dmanual/04a-05.pdf