For every 30 feet or water you get roughly an extra atmosphere of weight. 1 atm is about 15lb psi. So that is about 1/2 per foot or 1/24 lb per inch. That is 2/3rd of an ounce or about 16 grams of extra weight for every inch of sea level rise per square inch of sea floor.
Very good post. I think it was a book or something that talked about thinking things out and even just making a guess on various things - but you could estimate well enough to provide you with a hint if something was correct or not.
Obviously it doesn’t sound like you are guessing at the numbers - but it was the same line of thinking and reasoning it out.
BTW - the land previously covered by the ice sheets from 15,000 years ago WAS depressed because of all of that weight (a mile thick in Seattle and Chicago and NYC) and the ground is still rebounding. Very slowly obviously, but enough to account for errors back in the day when measurements at fixed water marks showed the sea level “dropping” over a hundred years or whatever. Until they figured out that the sea-level wasn’t dropping - it was the land raising!
I think that their might even be very minor earthquakes related to the rebounding.