measure water volume… Home › Forums › Public Forums › General Plumbing › measure water volume… This topic has 2 replies, 3 voices, and was last updated 20 years, 9 months ago by Robert Stephen Morton. Viewing 2 reply threads Author Posts 28 Jul 2003 at 1:11 pm #276795 MasterPlumbersKeymaster Does anyone know the formula I could use to measure the volume of water in my rainwater tank, Imperial or Metric as I can convert….Thanks 28 Jul 2003 at 3:30 pm #294805 GarySlusserParticipant A http://www.google.com search of the web found this: http://tinyurl.com/ia79 BTW, thanks for asking the question so I could find something I’ve thought about looking for, for some time. GaryQuality Water Associates 28 Jul 2003 at 9:45 pm #294806 Robert Stephen MortonParticipant G=D2x4.9xH Where g= Gallons Diameter in ft4.9 CoeficientH = Height in ftBob Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In