This can only be calculated once the length of the pipe in question has been established.
This pipe will hold 23,500.7 gallons of water.
100 feet by 100 feet by one inch equates to 6,233.76 gallons of water.
100 feet of 3-inch pipe holds 36.73 gallons of water.
To convert feet of water line to gallons, you need the volume of the water line. The volume of a 2-inch diameter water line is about 0.0107 gallons per foot. So, 1000 feet of 2-inch water line would be approximately 10.7 gallons.
About 235 gallons of water.
22.44 gallons for each inch of the water's depth.
12,239.9 gallons of water per 3,000 feet.
5.5 gallons per 15 feet of 3-inch pipe.
111 gallons of water.
14.7 gallons of water.
A 72-inch pipe 16 feet long holds up to 3,384.1 US gallons of water.
You would need 2,451 feet of 2-inch pipe for 400 gallons.