An inflow hydrograph is given for a reservoir that has a weir-spillway outflow structure. The flow through the spillway is governed by the equation
Q = 3.75Ly3/2 (cfs),
where L is the length of the weir and y is the height of the water above the spillway crest. The storage in the reservoir is governed by
S = 300y (ac-ft).
Using Δt = 12 hr, L = 15 ft, and S0 = Q0 = O, route the inflow hydrograph through the reservoir using the storage indication method.
Time (hr) | Inflow (cfs) |
12 | 40 |
24 | 35 |
36 | 37 |
48 | 125 |
60 | 340 |
72 | 575 |
84 | 722 |
96 | 740 |
108 | 673 |
120 | 456 |
132 | 250 |
144 | 140 |
156 | 10 |
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