A 1000-ft long, 2-ft long diameter ductile iron pipeline connects two reservoirs. The elevation difference between the water level is 200 feet. The outside diameter of the pipe is 2.25 ft and can neglect longitudinal stress. The flow rate is 50 cfs. Determine the maximum water hammer pressure (in psi) that is likely to occur if the downstream flow valve is closed in 1.4 seconds.  Bulk Modulus of Elasticity of water and the ductile iron pipe is 3.2x10⁵ lbf/ft2 and 2.3x10⁷ lbf/ft², respectively