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Calculate the SCS unit hydrograph, UH, for a drainage basin using the Gamma equation:
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*Referencing Part 630, Hydrology, Chapter 16, Hydrographs, National Engineering Handbook, USDA, NRCS this calculation is to be used to calculate the SCS unit hydrograph for a watershed using the gamma equation. |
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Calculation: |
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Designer/Checker: |
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Input: |
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Enter the time of concentration (tc - hr) |
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Enter the gamma equation shape factor (m) |
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Drainage area (Am - sq mi or sq km) |
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Output: |
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Time to peak, tp = |
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Unit peak discharge, qp = |
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Sum of dimensionless DUH coordinates = |
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Nondimensional time interval of DUH = |
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Peak rate factor, PRF = |
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Volume Under the Hydrograph = |
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Runoff Volume, Vr = |
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