Rock For French Drain

Discussion in 'Landscape Architecture and Design' started by White Gardens, Nov 26, 2008.

  1. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Posts: 4,347

    thats deep. are you just using it to carry the rain water from the gutters, or french drain and rain water from gutters?
     
  2. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Part of the project is going to entail a buried electrical service, so the run next to the garage had to be no higher than 19 inches below the surface for the conduit to lay on top of my tile, and still be around 18 inches below the surface.

    So that is why it is deep to start with, and I wanted a steep grade at the end to help push the water out faster.

    It is going to work as a foundation drain, french drain, and drain for the gutters too.
     
  3. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Posts: 4,347

    Looks good, have fun backfilling:)

    Inject the trench with a water hose to help settle it once you have backfilled. Tamp, and let settle another week or so, and then revisit for a final tamping/cleanup.

    What are you going to do with all of the extra soil. Particle size and structure looks really good. I'm guessing you havent had rain in a while?
     
  4. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    The dirt is a medium grade, highly erodible top soil. It was, and I say was, fairly dry until we got 6 inches of snow last night and today.

    The dirt is going to build a berm in front of the area that I trenched along the garage. I think in Pic #1. It's going to help divert some of the surface water away from that corner.

    The trench is going to be compacted as I fill it. I'm just going to use my sledge hammer every 4-6 inches of washed gravel.
     
  5. txgrassguy

    txgrassguy LawnSite Gold Member
    Posts: 3,083

    Everything sounded okay until you mentioned fabric across the top of the pipe or trench.
    Fabric is bad news as it will clog and "blind" the drain.
    Remember that 4" corrugated pipe is smooth on the inside and fines/soil that migrate into the drain can easily be washed out to the collection basin.
    In fact my crews are currently installing over 700 linear feet of corrugated perforated and solid pipe to drain a property prone to flooding during a rain event.
    The work pays well too, $4500 just for the drain work.
    Provided I can get my camera to function properly I'll take some photos.
     
  6. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Do you think I should line the trench with fabric and not cover it, or not put in any fabric at all. the suggestions for this fabric is to put it on top of your backfill and put soil on top of it. I'm going to have to wait another 3-4 days for the snow to burn off to finish it.

    Now I'm confused on what I should do.
     
  7. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Posts: 4,347

    you need fabric where you are using rock. or else the soil will fill in the pore spaces between the rock, thus eliminating the unique characteristic of the rocks ability to carry water easily.

    txgrassguy. thats only $6.40 a ft. are you using rock in that as well? or is it just solid drain pipe? we charge 10' ft for drain with rock minimum.
     
  8. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Ya, I'm going to use fabric over the whole thing then, I want rock all the way to the surface to help create a good drain field.
     
  9. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Posts: 4,347

    well, you want to place soil for like 4" at the top. you don't need to have the rock exposed. it will look ugly, and it will become hard to maintain. wrap the fabric over the top, and cover with 4" of soil.
     
  10. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Thanks, I was thinking that. In the area next to the house and garage is going to have mulch put down, so a couple inches of soil and a couple inches of mulch should do the trick. the rest of the run is in the driveway, so putting rock over my fabric won't be a big deal.

    Thanks for your help. I've been 90% positive on how I wanted to do this project so it would last for many years, thanks for helping confirm my initial instincts on how it should be done.

    This project is 100 feet and I'm charging around $2700, that's including 3-4 yards of mulch and the removal of the 4.5 tons of rock to get started.
     

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