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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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| !t/tc !!Q/Qp
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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*tc, and the time base is equal to 11*tc.
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| [[Image:WMSImage81.gif]]
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| where:
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| * tc = time of concentration.
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| * Q = Flow at time t, in cfs.
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| * Qp = 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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