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  1. 2nd May 2007, 08:09 PM #1
    gsouth
    gsouth is offline Member
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    Default Stormwater - 90mm v 65mm

    Hi all,
    I am putting in a sump to trap some rainwater runoff from a new paved area.
    I'll be connecting it into an existing 90mm line that runs to the street, however to help me get fall I was looking ar running 65mm pipe. From near the top of the pit to the bottom of the 90mm existing line.

    I know that 65mm will move less water than 90mm however I am trying to figure out if 65mm will suffice.

    Cheers
    Geoff
  2. 2nd May 2007, 08:47 PM #2
    peter_sm
    peter_sm is offline Senior Member
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    65mm will move half as much water as 90mm. You decide if that is enough size
  3. 2nd May 2007, 08:50 PM #3
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    Big Shed
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    Didn't know they made 65mm SW pipe, was under the impression 75 and 90mm were standard?
  4. 2nd May 2007, 10:01 PM #4
    gsouth
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    sorry - you are correct I meant to say 75mm
  5. 2nd May 2007, 10:46 PM #5
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    dazzler
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    yeah, you decide and stop buggin us

  6. 2nd May 2007, 10:51 PM #6
    peter_sm
    peter_sm is offline Senior Member
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    75mm will be heaps, unless you are looking at runoff from over 200 square metres
  7. 2nd May 2007, 10:55 PM #7
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    dazzler
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    Can you put 2 x 75mm ones side by side to get the flow

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