Search results with tag "Runoff coefficient"
B. Stormwater Calculations - NC
files.nc.govThe composite runoff coefficient, C, reflects the runoff potential of the drainage area. The range of runoff coefficients varies from 0.35 to 0.95, with higher values corresponding to greater runoff potential. The composite runoff coefficient is the weighted average of all of the land uses within the drainage area.
Table 3-1 Runoff Coefficients for Rational Formula Type of ...
www.shiawassee.netTable 3-1 Runoff Coefficients for Rational Formula Type of Drainage Area Runoff Coefficient, C* Concrete or Asphalt Pavement 0.8 – 0.9 Commercial and Industrial 0.7 – 0.9 Gravel Roadways and Shoulders 0.5 – 0.7 Residential – Urban 0.5 – 0.7 Residential – Suburban 0.3 – 0.5 Undeveloped 0.1 – 0.3 Berms 0.1 – 0.3
Chapter 6 Runoff - UDFCD
udfcd.orgRunoff coefficient vs. watershed imperviousness NRCS HSG C and D.....12 Figure 6-4. Slope correction for streams and vegetated channels .....19. August 2018 Urban Drainage and Flood Control District 6-1 Urban Storm Drainage Criteria Manual Volume 1 . 1.0 Overview The importance of accurate runoff ...
Stormwater Drainage Design for Parking Lots
www.pdhonline.com9. Peak Runoff 10. Time of Concentration 11. Runoff Coefficient 12. Flow Depth and Spread 13. Drainage Inlets 14. Inlet Locations 15. Stormwater Detention/Retention 16. Design Examples 17. Other Considerations 1. Regulatory Considerations The stormwater drainage design for parking lots must meet federal, state, and local regulatory requirements.
Methods of runoff estimation and its measurement
www.dowrodisha.gov.inRunoff coefficient (C) Sl No. Soil type Land use Cultivation Pasture Forest 1 Soil with above average infiltration rate i.e. sandy or gravel 0.29 0.15 0.1 2 Soil with average infiltration rate, no 0.4 0.35 0.3 clay pans, loams and similar soil 3 Soil with below average infiltration rates, heavy clay soils or soils with a clay pan near the ...
APPENDIX F – RATIONAL METHOD - Oregon
www.oregon.gov• Runoff Coefficient "C" This variable represents the ratio of runoff to rainfall. It is the - most difficult input variable to estimate. It represents the interaction of many complex factors, including the storage of water in surface depressions, infiltration, antecedent
EVALUATION OF RATIONAL METHOD “C” VALUES
www.sandiegocounty.govC = 0.90 (% impervious) + CP (% pervious) * Department of Public Works Hydrology Manual, December 1991 edition. Where the runoff coefficient is the percent that runs off from the impervious area plus the
Runoff and Peak Flow - Institute for Transportation
intrans.iastate.eduMar 02, 2020 · a. Runoff Coefficient: The runoff coefficient (C) represents the integrated effects of infiltration, evaporation, retention, flow routing, and interception; all of which affect the time distribution and peak rate of runoff. The runoff coefficient is the variable of the Rational
Runoff Coefficient (C) Fact Sheet - California
www.waterboards.ca.govIt is measured by determining the soil type, gradient, permeability and land use. The values are taken from the table below. The larger values correspond to higher runoff and lower infiltration. Land Use. C Land Use. C Busin Do Ne 0 0 Lawn San San San Hea Hea Hea.05 0 15 .13 8 .25 ess: wntown areas ighborhood areas 0.7 0.5