WMS:Universal Rational Hydrograph: Difference between revisions
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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>''. | Notice that the peak occurs at ''3*t<sub>c</sub>'', and the time base is equal to ''11*t<sub>c</sub>''. | ||
[[Image:UniversalRationalHydrograph.png]] | :[[Image:UniversalRationalHydrograph.png]] | ||
where: | :where: | ||
* ''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 <math>t</math>, in cfs. | ||
* ''Q<sub>p</sub>'' = Peak flow. | :* ''Q<sub>p</sub>'' = Peak flow. | ||
Revision as of 17:38, 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.
| ||
| 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.
- where:
- tc = Time of concentration.
- Q = Flow at time , in cfs.
- Qp = Peak flow.
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