Begin by calculating the volume - you have all the information you need to do that. Next find the conversion factor that permits you to convert a cubic meter into gallons. Perform the algebraic conversion, and you will have your answer. The objective of your question is to prompt you to figure it out, and perform the math. Show your work on your answer sheet, or you will not receive full credit for the answer.
1 acre = 43,500 ft2vol = area * depth = 43,500*5 = 217,500 ft31 ft3 is approx. 7.48 gallons217,500 ft3 * (7.48 gal/ft3) = 1,626,900 gallons
1 acre = 43,560 sq ft → volume pond (liquid) = 3/4 x 43,560 sq ft x 6 ft = 196,020 cu ft * In UK: 196,020 cu ft ≈ 1,220,976 imp gal * In US: 196,020 cu ft ≈ 1,466,331 US gal
1 acre = 43,560 square feet If the sides of the pond are straight ... its cross section area is 1/4 acre all the way down to the bottom ... then its volume is (43,560/4) x (5) = 54,450 cubic feet = 407,314.3 gallons
It's unlikely that your pond has vertical sides and is 3' deep everywhere, but if it were, it would hold 18 * 7 * 3 = 378 cu. ft. of water. Converting the dimensions to metric at the start makes everything easier. 378 * (12^3) * (2.54^3) give you the number of cc's, dividing that by 1000 gives you the number of liters (10703). Dividing THAT by 3.7854 (liters/gallon) gives you about 2828 gallons. A typical pond, however, probably slopes from very shallow at the periphery to maximum depth near the center. This means it likely holds 30 - 40% less than if it had steep vertical sides and a consistent depth (like a typical above-ground pool). Your pond is probably on the order of 1500 - 1900 gallons.
1,000,000 US gallons is about 134,000 cubic feet. A round tank of 56 feet diameter by 56 feet high will hold 1 million US gallons. Also a round pond of about 413 feet diameter by 1 foot deep.
If the pond is uniformly 6-feet deep it would contain about 1,955,109 gallons of water.
A 25-acre pond that is uniformly 6 feet deep will hold about 48,877,714 gallons of water.
1234.29 gallons of water
This pond can hold up to 1,346,493.51 gallons of water.
Approximately 48,878,000 gallons.
Approximately 977,553 gallons of water.
2300
1,256.727 (rounded)
This pond can hold up to 1,436.26 gallons of water.
43560x7x7.48052=2,280,960.1584
This pond can hold up to 533 gallons of water.
598 Imperial gallons, approx.