## What is the formula to determine the change in pressure when there is a change in flow?

[Updated to help clarify my question] I have a current water flow of 9 GPM (gallons per minute) at 50 PSI through a 1/2 inch diameter pipe pouring out at the end. I understand that if I reduce the flow at the end (exit) of the pipe, it will increase the pressure of the water … Read more