Any more and you might drown, it's meant to relax, not kill
maximum depth is listed at 210 feet.
NObody knew the depth as its immpossible 4 any one in the world
Most spa's and hot tubs are 4 1/2' deep.
okay it is 27 feet depth but no one reallt knows the maximum depth
It has a length of 277 miles, a width that varies from 4 to 18 miles and a depth of 6,000 feet.
4 feet
An average of 4 feet.
61
30 x 13 x 5.9 (gallons per cubic foot for that particular shape) x 5 (average depth) = 11,500 US gallons, not including the spa since you gave no specifics on the spa.
A hockey goal is 6' x 4' .
If you are asking for "square" feet, the depth is irrelevent. The area would be 85 square feet If you want a figure which takes the depth of 4 inches into the account, the number of "cubic feet" would be roughly 28 cubic feet.
The frost line depth for North Dakota is 4 feet normally to 6.5 feet extreme. 5 feet would be safe for posts.