Hi all, I got the system (attached below) and I am trying to work out the following (at point x-outflow): -net head of the system (I guess this isnt really at point x) -flow rate -pressure I know the flowrate and pressure at point Y, I also know how high the water in the tank is at equilibrium (relative to point x) and I also know the frictional losses in the pipe. Now the ball on the tank is an equilibrium valve. I have been told that the tank is a constant head tank, I know that means that it will maintain a constant head during the operation. So Im a bit stuck on working out flow rate, pressure and net head at point x. Here is what I think: The net head of the system is basically the height between the water in the tank and point x To work out the flow at point-X. I can apply bernoulli's equation between points y and x. I know Py, Vy,Hy...however all I know at x is Hx. Thank you in advance for any assistance.