12ft
12 x 12 feet, 4 inches deep: 1.8 cubic yards, minimum.
The Olympic pool in China is reported to be 3m deep. ---- For top class water polo the minimum water depth is 1.8m
It depends how deep you go. If you do 2 inches deep the area will require at least 0.7 cubic yards (about 1,710 pounds) of gravel.
.... a statue that's 12ft tall.... What ever is 12ft tall
13.378 square meters.
(12ft x 12ft) square =144 sq ft. 12ft x (12 ft square) is 1728 cu ft.
12ft by 8ft 12ft by 8ft
144
The shipping channel ranges from 12ft at the edge of the channel to 40ft at its deepest point.
You need more information. But, let's assume the pool is 8 feet deep at the deep end and 3 feet at the shallow end. If the pool is rectangular, the total volume will be 28,798 gallons of water.
50ft x 12ft x .5ft = 300 ft3