Question: A centrifugal pump is to be used to pump all the water from a small excavation that has been flooded. The dimensions of the volume holding water are70 ft long, 50 ft wide, and 12 ft deep. The water must be pumped against an average total head of 45 ft. The average height of the pump above the water will be 12 ft. If the excavation inust be emptied in 15 hours, determine the minimum model self-priming pump class M to be used based on the ratings of the Contractors Pump Bureau. (349 gpm, ModeI40-M, approximately 600 gpm)