How To Calculate Drainage - ndspro.com

What is the Coefficient of Runoff? The 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.

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Table 3-1 Runoff Coefficients for Rational Formula Type of ...

Table 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

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Chapter 6 Runoff - UDFCD

Runoff coefficient vs. watershed imperviousness NRCS HSG B .....12 Figure 6-3. Runoff coefficient vs. watershed imperviousness NRCS HSG C and D.....12 Figure 6-4. Slope correction for streams and vegetated channels .....19 . August …

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Stormwater Drainage Design for Parking Lots

9. 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.

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EVALUATION OF RATIONAL METHOD “C” VALUES

C = 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

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Runoff and Peak Flow - Institute for Transportation

Mar 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

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Owner's Manual - HydroCAD Stormwater Modeling Software

HydroCAD is a Computer Aided Design program for modeling the hydrology and hydraulics of stormwater runoff, commonly referred to as H&H. HydroCAD uses procedures developed by the Soil Conservation Service (now the Natural Resou rces Conservation Service), plus a …

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2011 HYDRAULICS MANUAL - Louisiana

2011 HYDRAULICS MANUAL Hydraulics (225) 379-1306. STATE OF LOUISIANA. DEPARTMENT OF TRANSPORTATION AND DEVELOPMENT. P.O. Box 94245. Baton Rouge, Louisiana 70804-9245

Methods of Data Collection, Sample Processing, and Data ...

Methods of Data Collection, Sample Processing, and Data Analysis for Edge-of-Field, Streamgaging, Subsurface-Tile, and Meteorological Stations at Discovery Farms and

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