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| The Universal Rational Hydrograph uses a set of coefficients and the peak discharge to compute the hydrograph ordinates at different times. The coefficients are shown in the following table and the resulting hydrograph is displayed.
| | #redirect [[WMS:Rational_Method_Computing_Hydrographs#Universal_Rational_Hydrograph]] |
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| {| Border=1 CellSpacing=0 CellPadding=2
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| |-
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| | ColSpan=2 |
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| {| Border=1 CellSpacing=0 CellPadding=2 style="background:#aaccff;"
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| |-
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| !Dimensionless Time and Hydrograph Ordinates
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| |}
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| |- style="background:#dfdfdf;"
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| !<math>t</math>/<math>t_c</math> !!<math>Q</math>/<math>Q_p</math>
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| |- Align=Center
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| |0 ||0.00
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| |- Align=Center
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| |1 ||0.21
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| |- Align=Center
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| |2 ||0.30
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| |- Align=Center
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| |3 ||1.00
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| |- Align=Center
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| |4 ||0.54
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| |- Align=Center
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| |5 ||0.39
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| |- Align=Center
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| |6 ||0.25
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| |- Align=Center
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| |7 ||0.18
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| |- Align=Center
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| |8 ||0.15
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| |- Align=Center
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| |9 ||0.14
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| |- Align=Center
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| |10 ||0.13
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| |- Align=Center
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| |11 ||0.00
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| |}
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| Notice that the peak occurs at <math>3*t_c</math>, and the time base is equal to <math>11*t_c</math>.
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| [[Image:UniversalRationalHydrograph.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>Qp</math> = Peak flow.
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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|U]]
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| [[Category:Equations|U]]
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