An M-rated self-priming centrifugal pump will be used to dewater an excavation during construction. The required pumping volume is estimated at 250 gal/min

(946 /min). The pump will be located 10 ft (3.1 m)

above the bottom of the excavation. The suction line will consist of 20 ft (6.1 m) of 3-in. (7.6-cm) hose, and the discharge line will consist of 80 ft (24.4 m) of 3-in. (7.6-

cm) hose. Water will be discharged 30 ft (9.2 m) above pump level.What is the total head developed? What is the minimum size pump required?