WMS:Universal Rational Hydrograph: Difference between revisions
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Notice that the peak occurs at <math>3*t_c</math>, and the time base is equal to <math>11*t_c</math>. | Notice that the peak occurs at <math>3*t_c</math>, and the time base is equal to <math>11*t_c</math>. | ||
[[Image:UniversalRationalHydrograph. | [[Image:UniversalRationalHydrograph.png]] | ||
where: | where: | ||
Revision as of 14:47, 2 November 2016
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.
| ||
| / | / | |
|---|---|---|
| 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 , and the time base is equal to .
where:
- = Time of concentration.
- = Flow at time , in cfs.
- = Peak flow.
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