4 inch or 6 inch

Discussion in 'Landscape Architecture and Design' started by bearcatlawn, Feb 17, 2006.

  1. bearcatlawn

    bearcatlawn LawnSite Member
    Messages: 32

    What size pipe do you guys use to tie in downspouts? There are 6 downspouts that have to go about 200 ft.
  2. Green-Pro

    Green-Pro LawnSite Bronze Member
    Messages: 1,420

    I've used both with no problems, but have used the 6" more than the 4". Given that many points of water collection I'd go with the 6", especially if you plan to tie any of them together.
  3. baddboygeorge

    baddboygeorge LawnSite Bronze Member
    Messages: 1,249

    i like 4" preferated works well if down spout is 6 inch go 6" preferated
  4. Coffeecraver

    Coffeecraver LawnSite Senior Member
    from VA.
    Messages: 793

    4" out of a 9x9 drain box

  5. sheshovel

    sheshovel LawnSite Fanatic
    Messages: 5,112

    I use 4" mainly and it depends on where you want the water to be weather or not you use perforated.
    no use in hooking up a drain line if it is just going to drain right back out where you are trying to move it away from.
  6. drsogr

    drsogr LawnSite Bronze Member
    Messages: 1,275

    4" should be plenty....you would be surprise the amount of volume you can push through a 4" pipe.
  7. AGLA

    AGLA LawnSite Bronze Member
    Messages: 1,774

    You can actually calculate the pipe size based on the area you are draining and the storm intensity that you want to be able to handle. Four inch pipe can handle quite a bit of roof in what we design for - 2.5" of rain with a one hour duration. That is a 25 year storm where I am.

    You can find calculation formulas on some downspout manufacturers websites if you really want to do it.
  8. down size

    down size LawnSite Member
    from indiana
    Messages: 78

    we almost always run 4" it moves alot of water. why do you have to run it so far? i always run them away from house and put in a pop up.
  9. Groundkeeperz

    Groundkeeperz LawnSite Member
    from VA
    Messages: 18

    4" works good

    6" is expensive and usually overkill
  10. Groundkeeperz

    Groundkeeperz LawnSite Member
    from VA
    Messages: 18

    6" is also harder to work with, meaning more time messing with something that probabbly isnt going to put anymore money in my pocket than the 4" that works great.

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