3. A pipeline is to be run from a water-treatment plant to a major suburban development 3 km away. The peak demand is 0.578 m3 /s. Determine the required diameter of ductile-iron pipe such that the flow velocity during peak demand is 2.5 m/s. Round the pipe diameter upward to the nearest 25 mm (i. e., 25 mm, 50 mm, 75 mm, . . .). The water pressure at the development is to be at least 140 kPa during peak demand. If the water at the treatment plant is stored in a ground-level reservoir where the level of the water is 10.00 m NGVD and the ground elevation at the suburban development is 8.80 m NGVD, determine the pump head that must be available to meet peak demands. (*NGVD