Water enters a nominal 3 inch schedule 40 pipe at 1.5 m/s and experiences a 90 degree curve down, followed by a 90 degree turn to level out the pipe again. the pipe is composed of 3 segments each 4 m long. if the water has a density of 997 kg/m3 and the pressure difference between the two ends of the pipe is 15 kpa, what size of thrust blocks will be required and at what angle will they need to act?