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    manoj 1234's Avatar
    manoj 1234 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 31, 2010, 10:20 PM
    Slope in drains
    Normally what slope should be kept in storm water drain
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Jan 31, 2010, 11:47 PM

    Here is a good resource: Storm/Flood engineering - storm pipe minimum slope???

    Generally it says you want a 2.5 f/s velocity in the pipes.

    1% for corrogated and 0.5% for rigid pipes. Remember to follow local codes.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Feb 1, 2010, 07:31 AM

    In my area we pitch our storm water runoff pipes between 1/8 and 1/4" slope to the foot. Cheers. Tom
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