Search results with tag "Rational method"
Design Manual Using the Rational Method to Chapter 4 ...
iowadot.govDesign Manual Chapter 4 Drainage . Originally Issued: 09-01-95 Revised: 07-02-15 . Office of Design . Chapter 4—Drainage Section 4A-5—Using the Rational Method to Determine Peak Flow Page 2 of 10 . The Rational Equation . The Rational Method uses the Rational equation given below: Q = CIA (Equation 4A-5_1)
General Permit for Discharge of Stormwater and - Connecticut
www.ct.govBMMCA Rev. 8/21/13 DEEP-WPED-GP-015 5 of 45 “Disturbance” means the execution of any of the construction activity(ies) defined in this general permit. “Effective Impervious Cover” is the total area of a site with a Rational Method runoff coefficient of 0.7 or greater (or other equivalent methodology) from which stormwater discharges directly to a surface water or
B. Stormwater Calculations - NC
files.nc.govThe peak flow is often calculated using the Rational Method. Calculating the peak flow is an important design step in designing a flow-based device such as a level spreader-filter strip. It is also important to meet SA waters requirements per 15A NCAC 02H .1019. The composite runoff coefficient, C, reflects the runoff potential of the drainage ...
APPENDIX A: Culvert Sizing procedures for the 100-Year ...
www.pacificwatershed.comexample: Rational Method used to calculate 100-year design storm 1. Area of example stream crossing watershed (A) = 100 acres.2. Runoff coefficient (C) = 0.30 (loam woodland soil, from table A-1)