Assuming that the INNER DIAMETER of the PVC pipe is 4" (...likely not the case, so you'll need to recalculate for your pipe's dimensions):
the volume of the pipe would be calculated as follows:
4" diameter = 2" radius
volume_cylinder = Pi*r^2*L; where r = 2" and L = 12"
the cylinder therefore has a capacity of 150.8 cubic inches.
a gallon of water has the volume of 231 cubic inches.
your pipe can hold 0.653 gallons of water.
you'll need about 18.38 inch lengths of 4" PVC to hold each gallon of water. again, these calculations rely on the INNER DIAMETER of the pipe being measured at 4" - if this is an outer diameter measurement, the above calculation for the capacity is OVERstated; the 18.38" calculation is UNDERstated.
One foot of 3 inch pipe will hold approximately 0.625 gallons of water.
A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
17,000 gallons
0.212 331 gallons per foot.
It will hold 477.4 gallons of water per 1,300-foot section.
18.264 gallons of water im not tottlaly shur but its my guess
2.75 Imperial gallons.
A 24-inch diameter cylinder holds 23.5 gallons of water per foot of length/height.
1 and 1/2 gallons
Over 9,000.
A 5-inch pipe will hold approximately 0.36 gallons of water per linear foot. This calculation is based on the formula for calculating the volume of a cylinder (V = Οr^2h), where the radius (r) is half the diameter of the pipe (2.5 inches) and the height (h) is 1 foot.
A two inch pipe can hold 0.1632 gallons per foot. It takes slightly over 6 feet of two inch pipe to hold one gallon of water.