Given an invert elevation of 105 1 for the pipe leaving M-6 in Figure 7.3 and using the pipe sizes determined in Problem, calculate the invert elevations in and out of M-5 and M- 4 if the street elevation at M-6 is 108 95 ft and at M-4 is 106.8? ft
Problem:
The following hydrograph was measured on a creek for a storm that produced 1.9 in. of rainfall in 2 hr. Losses due to depression storage, infiltration, and interception amounted to 0.4 in.
| Time from Beginning of Storm (hr) | Discharge ( ft3/s) |
Storm begins | 0 | 73 |
| 6 | 75 |
| 12 | 900 |
| 18 | 3400 |
| 24 | 4350 |
| 30 | 2900 |
| 36 | 1450 |
| 42 | 600 |
| 48 | 450 |
| 54 | 375 |
| 60 | 250 |
| 66 | 180 |
| 72 | 135 |
A spillway design storm is 10 in. of effective rainfall in 8 hr. Estimate the inflow hydrograph for the design storm.
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