Now that I have your attention ....


I need a solution for solving the following problem.

What is the discharge (whatever units) of a certain diameter PVC pipe of a given length with variable head pressure?

I have a pond with a 12" PVC siphon. The emergency overflow is about 1 ft above the height of the siphon. I have a few input flow measurements (cfs by computing cross sectional areas on straight section of stream, using average trapezoid) taken over time from different rainfall events. Ultimately, I'd like to relate rainfall events to outflow and predict when the emergency spillway will operate. This will inform me concerning diversion construction of the outflow.

This I want to diy rather than hire an engineer. A mistake won't be threatening to anything except my fragile ego.

Thanks for your comments!