Water is pumped between the two tanks described in Example 11.3 once a day, 365 days a y...

Water is pumped between the two tanks described in Example 11.3 once a day, 365 days a year, with each pumping period lasting 2 hr. The water levels in the two tanks remain essentially constant. Estimate the annual cost of the electrical power needed to operate the pump if it were located in your city. You will have to make a reasonable estimate for the efficiency of the motor used to drive the pump. Due to aging, it can be expected that the overall resistance of the system will increase with time. If the operating point shown in Fig. E11.3c changes to a point where the flowrate has been reduced to 1000 gpm, what will be the new annual cost of operating the pump? Assume the cost of electrical power remains the same.