Volumetric flow rate (simple???) Assuming reservoir level stays constant, and friction losses are negligible compared to gravitational effects, which overflow config achieves a higher volumetric flow rate? http://boards.420chan.org/tesla/src/1311021903815.jpg [Broken] --------------------- Now, I'm arguing with a friend about this. He's saying the long pipe will have the greater flow, using the steady state energy equation. I don't think that analysis will be valid here though...any ideas? Thanks.