The 4-hr unit hydrograph for a 5,600-acre watershed is:
Time (hr) | 0 | 2 | 4 | 6 | 8 | 10 | 12 |
Q (cfs) | 0 | 400 | 1,000 | 800 | 400 | 200 | 0 |
The local 10-year IDF curve is linear with the equation I = 5.6 − 0.2D, where I is rain intensity in in./hr and D is the rain duration in hours. Use the rational method to determine the peak 10-year flow rate for the watershed. Compare this with the unit hydrograph estimate of the 10-year peak (ϕ = 1.0 in./hr). Use tc as the time from the cessation of rain to the cessation of runoff.
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