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    Thread: flow calculator

    1. #1
      Ronfire is offline Junior Member
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      flow calculator

      I was looking at this gravity flow calculator I found here on this site http://www.calctool.org/CALC/eng/civil/hazen-williams_g

      If I use a 3" pipe and have a 1" drop it should flow at 54gpm. Does that mean if I have a pipe from a bottom drain that returns up to 1" below the pond level I would get 54gpm? Am I missing something . Wish I was good at sketchup for a diagram.

    2. #2
      BWG is online now Senior Member
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      No, it says slope but it translates into head pressure exerted on the pipe. Also depends on pipe length. You also have to add in equivalent length of all fittings on the pipe run.

      Examples for 3 inch PVC pipe 20 feet at 1 and 12 inches head pressure. Also applies to a sloped pipe and the outlet must be unrestricted to be gravity flow.
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      Last edited by BWG; 05-16-2018 at 05:57 PM.

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