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 ∆t = 12 hr, L = 15 ft, and So = Qo = 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