1.5x4x6x7.48 gallons/cubic foot=269.28 us gallons
598 Imperial gallons, approx.
10,408 gallons.
7,646.4 gallons are needed.
About 24 gallons.
About 18,402 gallons.
Approximately 1,616 US gallons.
13,594 US gallons of water.
If rectangular about 21,000 gallons if oval about 16,000 gallons
My answer would be 18.75 gallons
About 4,650 gallons.
1,770 gallons.
3384 gallons for every foot deep it is.