WMS:Universal Rational Hydrograph: Difference between revisions

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:* ''t<sub>c</sub>'' = Time of concentration.
:* ''t<sub>c</sub>'' = Time of concentration.
:* ''Q'' = Flow at time <math>t</math>, in cfs.
:* ''Q'' = Flow at time ''t'', in cfs.
:* ''Q<sub>p</sub>'' = Peak flow.
:* ''Q<sub>p</sub>'' = Peak flow.



Revision as of 17:39, 17 October 2017

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.

Dimensionless Time and Hydrograph Ordinates
t/tc Q/Qp
0 0.00
1 0.21
2 0.30
3 1.00
4 0.54
5 0.39
6 0.25
7 0.18
8 0.15
9 0.14
10 0.13
11 0.00

Notice that the peak occurs at 3*tc, and the time base is equal to 11*tc.

UniversalRationalHydrograph.png
where:
  • tc = Time of concentration.
  • Q = Flow at time t, in cfs.
  • Qp = Peak flow.


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