WMS:Universal Rational Hydrograph
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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.
| ||
| 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 t, in cfs.
- Qp = Peak flow.
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