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  1. #1
    Super Star Member
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    Default Ditch Pitch ?

    What is the min recommended drop or slope for a driveway culvert?

    I'm installing 80 feet of 15 inch diameter plastic pipe and I don't want the lower end to be to much deeper down than the upper end.

  2. #2
    Super Star Member Egon's Avatar
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    Default Re: Ditch Pitch ?

    About a quarter of a bubble on a level should do it.

    Egon

  3. #3
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    Default Re: Ditch Pitch ?

    I think it is 1 inch slope for every 4 foot of length. Of course, I have been wrong before... [img]/forums/images/graemlins/tongue.gif[/img]

  4. #4
    Super Member Highbeam's Avatar
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    Kioti CK30HST

    Default Re: Ditch Pitch ?

    The orange book, a sewer book, calls out the minimum slope for 15 inch to be 0.15 feet per 100. Odd that the diameter is the same as the slope. This slope is to provide enough velocity to push turds down the line and is the reference I use for storm system design.

    0.15% is the minimum slope for a 15" pipe.

  5. #5
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    Default Re: Ditch Pitch ?

    No doubt your culvert was installed some time ago, but including a thread that has quite a bit of info on driveway const. - may help someone.
    penokee [img]/forums/images/graemlins/smile.gif[/img]

    http://theurbanrancher.tamu.edu/home/ruraldriveway.html




  6. #6

    Join Date
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    North East CT
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    2003 Kubota BX-22

    Default Re: Ditch Pitch ?

    </font><font color="blue" class="small">( What is the min recommended drop or slope for a driveway culvert?

    I'm installing 80 feet of 15 inch diameter plastic pipe and I don't want the lower end to be to much deeper down than the upper end. )</font>

    What is the min recommended drop or slope for a driveway culvert?

    I'm installing 80 feet of 15 inch diameter plastic pipe and I don't want the lower end to be to much deeper down than the upper end.


    BX23 W/ Ag tires $8100 FEL$2300 BH$3800 60"
    MMM$1300. total$15500

    Edited by LBrown59 (05/28/05 09:27 PM)

    [img]/forums/images/graemlins/grin.gif[/img]

  7. #7
    Veteran Member GeneD14's Avatar
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    Southern Indiana
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    Kubota M95s, Allis Chalmers 185 & D17 series IV, Kubota ZG-23 Mower, Kawasaki Mule 610

    Default Re: Ditch Pitch ?

    An excavator that I used to help said the rule of thumb was 1" drop for every 10' run.

  8. #8
    Super Star Member
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    Default Re: Ditch Pitch ?

    ?

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