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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:WMSImage80.gif]]
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| where:
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| * t<sub>c</sub> = time of concentration.
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| * Q = Flow at time t, in cfs.
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| * Q<sub>p</sub> = Peak flow.
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| * r = falling limb coefficient
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| * s<sub>d</sub> = 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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