Refer to the hydrologic data used in Problem.
What is the runoff coefficient for the September 1, 1999, storm, where Coeff. = R/P?
Problem
Table lists rainfall data recorded at a USGS gage for the storm of September 1, 1999. The basin area is 2050 acres. Using these data, develop a rainfall hyetograph (in./hr vs. t) in 15-min intervals and determine the time period with the highest intensity rainfall.
Table
Time (hr) | Accumulated Rainfall (in.) | Discharge (cfs) |
16:05 | 0 | 0 |
16:20 | 0.4 | 5 |
16:35 | 1.4 | 600 |
16:50 | 1.9 | 1110 |
17:05 | 2.3 | 1300 |
17:20 | 2.5 | 1380 |
17:35 | 2.6 | 1350 |
17:50 |
| 1280 |
18:05 |
| 1110 |
18:20 |
| 790 |
18:35 |
| 460 |
18:50 |
| 240 |
19:05 |
| 110 |
19:20 |
| 59 |
19:35 |
| 35 |
19:50 |
| 20 |
20:05 |
| 12 |
20:20 |
| 7 |
20:35 |
| 4 |
20:50 |
| 2 |
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