Just FWI - one of the 100 things that make the "water canopy" posed by the WT utterly stupid and impossible is this:
Ask who thinks there was one this question. So how much do you think it rained? No no one is gonna say like 30 ft, or 50ft. They are gonna go pretty high. Just say for giggles they say 500ft.
Remind them if that was the case. Atmospheric pressure a at sea level would be like you were living 500ft under the sea. Any thing living on the ground, like all mammals, would have been crushed by that type of pressure. So the nice snake that Eve talked to, could not have existed then. Nor any bears or lions that Adam snuggled with.
Also not one bird could have lived or flown.
Now if they say, like what I have usually heard, "maybe a mile of water" well that makes the argument for a canopy even sillier.
There are many simple irrefutable common sense arguments against the flood without getting to technical.