An irrigation micro-tuberises from Point A at the outlet of a supply main, up to the top of a hops trellis(Point B), before dropping down to Point C and extending on to supply an irrigation emitter. At point A the internal diameter (ID) is 8 mm, the head is 5 m and the velocity is 0.2 m/s. Point C is 2 m higher than Point A, and Point B is 4 m higherthan Point C. The ID at Point C and Point B are 12 mm and 4 mm respectively.Ignoring all losses, determine the pressure at all three points in the tube.