Using Bernoulli equation solves this question. A pipe of 300 m long has a slope of 1:100 and converts from a 1.0 m diameter at its upper end, where the pressure is 68.7 kPa, to 0.5 m at its lower end. If the water flows at a rate of 5400 l/min, determine the pressure at the lower end. Assume the energy loss due to friction inside the pipe is negligible.