To sum up.
The bible is fiction, and JWs are part of a cult.
There is no evidence of a water canopy and if you had a water lens above the earth it would probably super heat the earth and burn it up.
SO many issues with the flood - but just remember this - all the WATER in the atmosphere would increase atmospheric pressure.
So say there was 100 feet worth of water that (ha ha ha) rained down.
It would be like you were living 100 feet under the sea instead of 15 psi we have now on us - it would be 58psi.
If it was 1000 feet of rainwater - any living things (fictional Noah included) would have been living with a 450psi atmosphere crushing im to slime.