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NOTICE The United States Government
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AUTHOR’S DISCLAIMER The contents
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Acknowledgements A project of the m
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4.2 Application of the Modified Rat
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List of Figures 2.1 The MRM hydrogr
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D.5 Modeled and observed peak disch
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The modified rational method extend
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2. Technical Aspects of the Rationa
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unoff, with a negligible amount of
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2.1.4. Summary and Important Implic
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If the storm duration is equal to t
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Figure 2.4: The instantaneous unit
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the ratio of peak rate of runoff to
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in these cases strictly converts th
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3. A Proposed Unified Rational Meth
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with the middle of the C-value rang
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10. The intercepts of β and expone
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Limits of the Unified Rational Meth
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T ⋆ as a “travel time” is ten
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5. Determine IU ⋆ using T L ⋆ b
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Table 3.1: Countywide values of mea
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Table 3.1: Countywide values of mea
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Table 3.2: Countywide values of sca
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Table 3.2: Countywide values of sca
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Table 3.2: Countywide values of sca
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Table 3.2: Countywide values of sca
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Table 3.3: Countywide values of exp
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Table 3.3: Countywide values of exp
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Table 3.3: Countywide values of exp
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Table 3.4: Countywide values of exp
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Table 3.4: Countywide values expone
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Table 3.4: Countywide values expone
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Table 3.5: Comparison of annual pea
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LATITUDE, IN DEGRESS 26 30 34 2−y
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PEAK DISCHARGE, IN CFS 0 5 10 15 20
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Figure 4.1: Subdivision X Drainage
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Figure 4.2: Depth-Duration diagram
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coefficient C as in Equation 4.1. W
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(Row 27) and the excess rainfall in
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Figure 4.6: Modified rational metho
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Figure 4.8: Modified rational metho
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this report to estimate T ∗ . Wit
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5. Summary and Conclusions This sec
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coefficients entirely). The method
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Bibliography Akan, A. O. (2002). Mo
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FHWA (1983). Urban Highway Storm Dr
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Roussel, M. C., D. B. Thompson, X.
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A. Literature Review The rational m
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Intensity (in/hr) 0 1 2 3 4 5 0 20
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storms with durations greater than
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The intent is to estimate the disch
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- Page 134 and 135: 1 0.9 0.8 0.7 MEDIAN CR 0.6 0.5 0.4
- Page 136 and 137: # print ( DDF .at.F); # print ( IDF
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- Page 150 and 151: 10000 Modeled Q p (cfs) 1000 100 1:
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