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| The Rational Unit Hydrograph has a time to peak equal to the time of concentration. Both the rising and receding limbs of the hydrograph have a duration equal to the time of concentration, and therefore the shape of the hydrograph is an isosceles triangle with a time base of 2t<sub>c</sub> as shown below. This method is chosen by specifying the Modified Hydrograph Method using 1.0 for the recession limb coefficient and t<sub>c</sub> for the storm duration.
| | #redirect [[WMS:Rational_Method_Computing_Hydrographs#Rational_Hydrograph]] |
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| [[Image:WMSImage79.gif]]
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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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