Footprint appears to be a right triangle with the hypotenuse in the shape of an arc. It’s basically one quarter of a cylinder from what I can figure. I don’t have solid data on the dimension but if I had to guess it looks like it might be 19”x19” and 66” tall, which would put the footprint at just shy of 2 sq ft. 80 gallons of water at 8.34lbs/gal is 667.2lbs, which would be 333.6 lbs/sq ft. That’s a fair bit of weight, but not unreasonable for a floor structure to carry, think about your fat uncle standing with his feet together or a grand piano sitting on its three legs. It’s been a very long while but somewhere I remember reading about the standard weight bearing design guidelines for residential floors in relation to installing gun safes on the floor, I seem to recall someone saying 500lbs/sq ft was the figure. Might be BS, don’t quote me.

All that said, for me these would be going into the basement on a slab-on-grade floor, so I’m not worried about the weight. It is a good consideration for people putting them on the main or second level of a stick frame house.

Here is the video I referenced where Nutnfancy sees one for sale at Honeyville in 2012, about 8:30 into the video. They had the 80 gal and a taller skinnier 30 gal in black plastic. No clue If they still sell them in store or not.

https://youtu.be/TZkqp7VR-zM