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Effective Precipitation from SCS Equation

Effective Precipitation from SCS Equation. Solution of the SCS Curve Number Equation. From Mays, 2011, Ground and Surface Water Hydrology. Example. A watershed with CN = 60 experiences 4 in of precipitation. What is the direct runoff?.

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Effective Precipitation from SCS Equation

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  1. Effective Precipitation from SCS Equation

  2. Solution of the SCS Curve Number Equation From Mays, 2011, Ground and Surface Water Hydrology

  3. Example • A watershed with CN = 60 experiences 4 in of precipitation. What is the direct runoff?

  4. Retention and CN depends on Antecedent Moisture Condition (AMC)Tabulated values are for Average Moisture Conditions From Mays, 2011, Ground and Surface Water Hydrology

  5. Retention and CN depends on Soil Group and Land Use .... .... From Mays, 2011, Ground and Surface Water Hydrology

  6. Example • A watershed has 40% residential (1/4 ac lots), 25% open space (good condition), 20% commercial and business (85% impervious) and 15% industrial (72% impervious) with corresponding soil groups of C, D, C and D. • What is the depth of runoff from 6 in of rain • Assume the rainfall occurs in a pattern of 2 in in first hour, 3 in in second hour and 1 in in third hour determine the rainfall excess hyetograph

  7. From Mays, 2011, Ground and Surface Water Hydrology

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