The pumping station shown in Figure 11-11 is designed for future conditions. The ultimat...

The pumping station shown in Figure 11-11 is designed for future conditions. The ultimate wet weather capacity is 60 mgd with one pump out of service. Flow measurement at the plant currently is 32 mgd peak, 15 mgd average day, and 6.2 mgd minimum. Size the pumps. How many pumps should be installed to meet existing flow? If pumps at the slowest speed operate at 50 percent of total capacity, will one pump run at the minimum flow?