Thank you for the reply.
My rising main is about 460m and it is 150mm PE. I cannot maintain constant elevation, there will be some dips and peaks, but I can try to "smoothen" them up. Peaks, of course, will collect gases released from water. The water velocities will be about 1.5-2.0 m/s...
I need to design rising main for combined foul/storm water pumping station. I was told by my manager that it is possible to design a rising main that is sloping away from the pumping station without air release valves if I lay the rising main under very slight gradient - air/gases released from...
