WMS:Universal Rational Hydrograph: Difference between revisions

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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]]
 
{| Border=1 CellSpacing=0 CellPadding=2
|-
| ColSpan=2 |
{| Border=1 CellSpacing=0 CellPadding=2 style="background:#aaccff;"
|-
!Dimensionless Time and Hydrograph Ordinates
|}
|- style="background:#dfdfdf;"
!<math>t</math>/<math>t_c</math> !!<math>Q</math>/<math>Q_p</math>
|- Align=Center
|0 ||0.00
|- Align=Center
|1 ||0.21
|- Align=Center
|2 ||0.30
|- Align=Center
|3 ||1.00
|- Align=Center
|4 ||0.54
|- Align=Center
|5 ||0.39
|- Align=Center
|6 ||0.25
|- Align=Center
|7 ||0.18
|- Align=Center
|8 ||0.15
|- Align=Center
|9 ||0.14
|- Align=Center
|10 ||0.13
|- Align=Center
|11 ||0.00
|}
 
 
Notice that the peak occurs at <math>3*t_c<math>, and the time base is equal to <math>11*t_c</math>.
 
[[Image:WMSImage81.gif]]
 
where:
 
* <math>t_c</math> = time of concentration.
* <math>Q</math> = Flow at time <math>t</math>, in cfs.
* <math>Qp</math> = Peak flow.
 
'''Related Topics:'''
* [[WMS:Rational Method Computing Hydrographs|Computing Hydrographs with Rational Method]]
* [[WMS:Rational Method Equation|Rational Method Equation]]

Latest revision as of 15:43, 11 December 2017