In article , CJT wrote:
dpb wrote:

snip
Let's see---if it were a 1600 sq-ft area, the volume at 8-ft ceiling
height would be 12,800 cu-ft -- ~96,000 gal (ok, that's pretty near
the 100k earlier guess) == ~~6,640,000 lb-wt

That would translate to a distributed lateral load of ~5200 lb-f/sq-ft
or 36 psi. That's expecting the house to hold the equivalent of 2-1/2
atmospheres w/ no apparent failures (even bowing walls aren't visible
in the pictures to any extent)--ain't agonna' happen.
snip

I think you're off by a factor of 10.

He's off by a lot more than that. A gallon of water weighs about 8-1/3 pounds,
so 96,000 gallons would weigh 800,000 pounds, not 6.6 million.

8 feet * .433 psi/ft is only about 3.5 psi.

800,000 pounds / 1600 sf = 500 pounds / sf = 0.29 psi.