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  1. #1
    Join Date
    Jul 2003
    Location
    Glen Innes NSW
    Age
    81
    Posts
    26

    Default How much water ?

    Hi all, just an enquiry.

    I have a building and the roof area is 52 square meters. Question is how big of a drainage pipe system would be required for the roof size. It currently has a ninety eight mill earthenware pipe which runs under the building for about 12 meters and is in need of replacement. I was hoping I could push some ninety mill
    sewerage line or some stormwater pvc through the existing pipe.

    All ideas welcome

    Kind regards mike

  2. #2
    Join Date
    Jan 2005
    Location
    Newcastle/Tamworth
    Posts
    416

    Default

    Mick visit the lysaght web site, they have a design manual that matches the applicable standard. Basically you design the drainage based on a rain intensity peak every 20 years. In Tamworth it is about 160mm/hr. There are tables where you read off the area and the gutter cross sectional area. Then finally the size of the downpipe.

    Cheers
    Pulse

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