Over a year ago I saw a chart (found it by accident) giving the water capacity of differnt sizes of pvc pipe for instance "x" size of pvc holds "y" amount of water in "z" length. I can't find it now, although I've used several different word combinations on searching online. Anyone know how I can find this? If not online, a book or a chart from a pipe supplier would be great, too. I know I could figure this out, using my math-gifted teenager, but she's got a job now. I would like a "cheat sheet" showing the capacity of several different sizes of pipe, ranging from 1" up to 6". I'm in the early phases of designing a water system that will rely upon a solar pump, and am thinking of using pvc pipe as part of the water storage system; also need to know the filled weight of different sizes of pvc (I can figure that out once I have the capacity numbers.) Thank you for any info you can provide.