10 Rainfall Intensity In Hr A 2 0 20 100 Yr Frequency 50 Yr Frequency 20 Yr Frequency 1 10 Yr Frequency 5 Yr Frequen 1 (149.11 KiB) Viewed 37 times
10 Rainfall intensity (in./hr) A 2 0 20 100-yr frequency 50-yr frequency 20-yr frequency. 1 10-yr frequency 5-yr frequency 60 Duration (min) 40 80 100 120
Using the rational method, compute the design flows for the pipes shown in the figure below: M-1 to M-2, M-2 to M-3, and M-3 to outfall. Assume the following: (1) Overland flow time of concentration as show in the figure; and (2) Return period, Tr = 10 yx, and Figure 7.7 are used for determining rainfall intensity; and (3) Pipe flow times to be: 2.5 min from M-1 to M- 2, and 2 min from M-2 to M-3. (figure not drawn to scale) 7 min 10 min 10 min I-3 I-2 Outfall M-2 I-1 A1 M-1 Area: 2.5 acres C₁ = 0.5 A2 Area: 3.5 acres C₂ = 0.6 A3 Area: 4.0 acre C3 = 0.45 M-3
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