Years ago we had some ponds put in so because of the time lapse my answer may not be exact. I believe the formula was as follows: 1 acre of water that is 1 foot deep equals about 300,000 gallons of water. That would make your pond about 31 gallons.
This pond can hold up to 533 gallons of water.
This size pond will hold up to 897.7 gallons of water.
Up to about 1,818 gallons of water.
A maximum of 1,651.7 gallons.
This pond can hold up to 201,974 gallons of water.
A pond this size holds up to about 1,955,108 gallons of water.
3,590,649.35 gallons.
If the pond is uniformly 6-feet deep it would contain about 1,955,109 gallons of water.
This pond can hold up to 1,346,493.51 gallons of water.
1234.29 gallons of water
This size pond can hold up to 2,992.21 gallons of water.
A 25-acre pond that is uniformly 6 feet deep will hold about 48,877,714 gallons of water.