Impossible. The flow meter was half out of the water.
Uh uh. Based on the marks that someone saw inside the piping, right? And isn't it curious that the only way such markings form is from standing water. We can go 'round and 'round on this again Jed, but you can't simply will facts into existence.
The manual says it does not work in a half-empty pipe, and anyone looking at this pipe could see it was half empty. It was a gravity return going to an open tank, for crying out loud.
This is the first time I remember you claiming that the return pipe was observed to have flowing water at the half empty level while the plant was in operation. Is that what you are claiming? Because before your argument was based solely on the internal markings within the pipe. So, did you see half-flowing water during the plant operation? Did Murray? Who did?