A major storm event was recorded for Little Bear Creek. The incremental rainfall and measured hydrograph data for this storm are provided in Table in 1-hr increments. The drainage area for the basin is 3.25 mi2. Assume that the base flow for Little Bear is zero. (See Fig. 1-26.)
Table
Little Bear Creek Data
Date/Time | Incremental Precipitation (in.) | Flow (cfs) | |
6/8/01 | 1 6:00 | 0 | 0.0 |
6/8/01 | 1 7:00 | 0.05 | 0.5 |
6/8/01 | 18:00 | 0.04 | 0.5 |
6/8/01 | 1 9:00 | 0 | 0.6 |
6/8/01 | 20:00 | 0.08 | 14 |
6/8/01 | 21 :00 | 0.05 | 32 |
6/8/01 | 22:00 | 0.42 | 54 |
6/8/01 | 23:00 | 0.1 | 78 |
6/9/01 | 0:00 | 0.3 | 105 |
6/9/01 | 1 :00 | 0.14 | 158 |
6/9/01 | 2:00 | 0.19 | 201 |
6/9/01 | 3:00 | 0.45 | 228 |
6/9/01 | 4:00 | 0.01 | 258 |
6/9/01 | 5:00 | 0 | 272 |
6/9/01 | 6:00 |
| 225 |
6/9/01 | 7:00 |
| 189 |
6/9/01 | 8:00 |
| 142 |
6/9/01 | 9:00 |
| 119 |
6/9/01 | 1 0:00 |
| 98 |
6/9/01 | 1 1 :00 |
| 66 |
6/9/01 | 1 2:00 |
| 42 |
6/9/01 | 1 3:00 |
| 27 |
6/9/01 | 1 4:00 |
| 0 |
(a) Using storm hydrograph, estimate the vol of runoff in inches over the watershed.
(b) Estimate the vol of infiltration (in.).
(c) Estimate tp for the entire event.
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