The FAQ page in the Wiki states..
Perhaps the best example of flat earth proof is the Bedford Level Experiment.
If the Bedford level experiment is the 'best example' of flat Earth proof then that doesn't exactly instill confidence in FE theory does it. First off I would suggest that the experiment does not actually provide proof that the Earth is flat because there are so many potential sources of error in how the experiment was performed that it cannot possibly provide definitive proof of anything. It may well have been done many time over a period of years but in each case the conditions (temperature, stability, pressure to mention just three examples) of the air over the water would have been different. That would not make it a 'fair test' in anyones reckoning.
A six mile stretch of water repressents 0.02% of the Earths circumference according to modern RE values. That is nowhere near enough for the methods that were available during Rowbothams time to reach a definitive conclusion. And ultimately the 'experiment' was actually just a series of imprecise observations. So that would make it something of a pseudo-science experiment wouldn't it Tom?