In the pump-pipeline system of Example 5.3, the discharge is controlled by a flow-throttling valve installed just upstream of the pump. What is the required head loss from this valve if the desired discharge in the pipe is 15 cfs? Would this be an efficient system? The pump characteristics are the same as in Example 5.3 and are shown in the following table to facilitate plotting.

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2(efs H, (ft) 300.0 295.5 282.0 259.5 225.5 187.5 138.0 79,5 10 15 20