Runoff Coefficient
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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.
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 ...
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
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 ...
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
How To Calculate Drainage - ndspro.com
www.ndspro.comThe Coefficient of Runoff, C, is the average percentage of water that runs off of a given surface material. A higher percentage of water that falls on concrete will run off than water that falls onto grass or sand. The Coefficient of Runoff is equal to the Runoff / Rainfall, expressed as a decimal. A table for the average Coefficient of Runoffs ...
Basic Hydrology – Runoff Curve Numbers
d32ogoqmya1dw8.cloudfront.net• It is essentially a coefficient that reduces the total precipitation to runoff potential, after “losses” – Evaporation, Absorption, Transpiration, Surface Storage. • Therefore the higher the CN value the higher the runoff potential will be.
Runoff Coefficient (C) Fact Sheet - California
www.waterboards.ca.govThe runoff coefficient (C) is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. It is a larger value for areas with low infiltration and high runoff (pavement, steep gradient), and lower for permeable, well vegetated areas (forest, flat …
DESIGN COEFFICIENT TABLES - CECALC.com
www.cecalc.comDESIGN COEFFICIENT TABLES Hazen-Williams Friction Factor (C) Pipe Material Values for C Range High/Low Average Value Typical Design Value Plastic, PVC, Polyethylene pipe or tubing 160/150 150-155 150 Cement or mastic lined iron or steel pipe 160/130 148 140 Copper, brass, lead, tin or glass pipe or tubing 150/120 140 130