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| The Modified Rational Hydrograph also assumes that the time to peak is equal to the ''t<sub>c</sub>'', but allows for the duration of the storm to be longer than ''t<sub>c</sub>, resulting in a trapezoidal shaped hydrograph as shown below. A coefficient to modify the slope of the receding limb may also be applied with this method.
| | #redirect [[WMS:Rational_Method_Computing_Hydrographs#Modified_Rational_Hydrograph]] |
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| [[Image:ModifiedRationalHydrograph.gif]]
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| where:
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| * <math>t_c</math> = Time of concentration.
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| * <math>Q</math> = Flow at time <math>t</math>, in cfs.
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| * <math>Q_p</math> = Peak flow.
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| * <math>r</math> = Falling limb coefficient
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| * <math>s_d</math> = Storm duration
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| ==Related Topics==
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| * [[WMS:Rational Method Computing Hydrographs|Computing Hydrographs with Rational Method]]
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| * [[WMS:Rational Method Equation|Rational Method Equation]]
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| {{WMSMain}}
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| [[Category:Rational Method|M]]
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| [[Category:Equations]]
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