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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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| | ColSpan=2 |
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| {| Border=1 CellSpacing=0 CellPadding=2 style="background:#aaccff;"
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| !Dimensionless Time and Hydrograph Ordinates
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| |}
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| |- style="background:#dfdfdf;"
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| !''t''/''t<sub>c</sub>'' !!''Q''/''Q<sub>p</sub>''
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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 ''3*t<sub>c</sub>'', and the time base is equal to ''11*t<sub>c</sub>''.
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| :[[Image:UniversalRationalHydrograph.png]]
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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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| ==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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| [[Category:WMS Plot]]
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| {{stub}}
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