There is no equivalence.
A foot is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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21780
21,780 square feet = 2,023 m2
43560/2 = 21780 sq ft
An acre is 43,560 sq ft, so half an acre is 21,780 sq ft. Th edepth is 16 feet so volume is 16 x 21780 = 348,480 cu ft. Ther is 7.48 gallons in a cu ft so 7.48 x 348,480 = 2,606,630 gallons
27,878,400 sq ft.