Assuming that 10 inches refer to the the inner diameter so that radius = 5 inches,
the capacity is pi*52*24 = 1885 cubic inches = 8.16 US gallons.
5.5 gallons per 15 feet of 3-inch pipe.
You would need 2,451 feet of 2-inch pipe for 400 gallons.
78.34 gallons per 480 feet in a 2-inch pipe.
This pipe will hold 23,500.7 gallons of water.
This pipe will hold 1,468.8 gallons of water.
A 72-inch pipe 16 feet long holds up to 3,384.1 US gallons of water.
10.2 US gallons.
100 feet of 3-inch pipe holds 36.73 gallons of water.
65.3 gallons or 8.7 cubic feet.
61.2 gallons for every 15 feet.
A 10-inch x 300' pipe holds 1,224 gallons.
A pipe this size holds 1,642 (1,642.12358) US gallons.