Depth in feet. | Pressure on sq. foot.
===============+======================
8 | 500 lbs.
16 | 1000 „
24 | 1500 „
32 | 2000 „
40 | 2500 „
48 | 3000 „
56 | 3500 „
64 | 4000 „
72 | 4500 „
80 | 5000 „
88 | 5500 „
96 | 6000 „
---------------+----------------------
1 mile, or 5,280 feet, 330,000 lbs.
5 miles, 1,650,000 „
This table is based upon an allowance of 62-1/2 lbs. of water to the
cubic foot, thus 8 feet × 62-1/2 = 500, etc.