Enough
If 20' is the circumference, then the answer is 833.4 gallons.
how many gallons of water does a swimming pool 15 feet by 4 feet deep hold
A round swimming pool 12 feet across by 4 feet deep will hold 452 ft3 which converts to 3,381 gallons
A 25-acre pond that is uniformly 6 feet deep will hold about 48,877,714 gallons of water.
Up to 168.3 gallons of water.
My swimming pool holds 1250 gallons. It is 12 feet diameter and 3 feet deep.
Go here: http://www.backyardcitypools.com/swimming-pools/Pool-Volume-Calculate.htm
Approximately 8,146,286 gallons of water.
This pool can hold a maximum of about 5,707.6 gallons of water.
This pool can hold a maximum of about 9,403 gallons of water.
How deep is the pool?
66 gallons