4.9 As shown in Fig. P4.9, river water used to irrigate a field is controlled by a gate. When the gate is raised, water flows steadily with a velocity of 75

ft/s through an opening 8 ft by 3 ft. If the gate is raised for 24 hours, determine the volume of water, in gallons, provided for irrigation. Assume the density of river water is 62.3 lb/ft³.