The mass curve of an isolated storm in a 500 ha watershed is as follows: Time (hr) 0 2 4 6 8 10 12 14 16 18 Cumulative rainfall (cm) 0 0.8 2.6 2.8 4.1 7.3 10.8 11.8 12.4 12.6 If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3, Determine the total ER and infiltration in cm. Estimate the Φ-index of the storm and the duration of the rainfall excess.
The mass curve of an isolated storm in a 500 ha watershed is as follows: Time (hr) 0 2 4 6 8 10 12 14 16 18 Cumulative rainfall (cm) 0 0.8 2.6 2.8 4.1 7.3 10.8 11.8 12.4 12.6 If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3, Determine the total ER and infiltration in cm. Estimate the Φ-index of the storm and the duration of the rainfall excess.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Phi-Index Method
The mass curve of an isolated storm in a 500 ha watershed is as follows:
| Time (hr) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| Cumulative rainfall (cm) | 0 | 0.8 | 2.6 | 2.8 | 4.1 | 7.3 | 10.8 | 11.8 | 12.4 | 12.6 |
If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3,
- Determine the total ER and infiltration in cm.
- Estimate the Φ-index of the storm and the duration of the rainfall excess.
- Plot the hyetograph showing the Φ-index.
- Plot the ER.
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