Plot the hydrograph for the storm data given in Problem 1 (flow rate vs. time). Label the following:
(a) peak flow Qp,
(b) time to peak tp (distance from the center of mass of rainfall to the peak flow),
(c) time of rise TR (distance from the start of discharge to the peak flow),
(d) time base TB (distance from the start of discharge to the end of discharge).
Problem 1
Refer to the hydrologic data used in Problem.
(a) Plot the cumulative mass curve for rainfall and the hydrograph (flow rate vs. time) on the same graph using two scales.
(b) Compute the volume of infiltration loss for the storm, neglecting ET by subtracting the volume of gross rainfall from the volume under the hydrograph.
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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