Looked like a 5' pimple

Discussion in 'Lawn Mowing' started by KirbysLawn, Jun 6, 2002.

  1. KirbysLawn

    KirbysLawn Millenium Member
    Messages: 3,485

    Today while mowing a lawn we spoted a large 5' round mound in the lawn. When I walked over to it and pressed on it, it shook like jelly. I stood on it and it was like I was standing on a pitchers mound.

    I got my rake out and used the handle to puncture the turf and release the water. No irrigation heads are there and it's not on a septic system.

    Anyone have other suggestions on what will cause this build-up of water under the turf?
  2. smalltime

    smalltime LawnSite Member
    Messages: 38

    Maybe a water main or sewage pipe leak? How close is it to a building? Could be runoff from downspouts. My playground area at my house has a drain pipe ending in the middle of it under the mulch. It sinks though.

  3. joshua

    joshua LawnSite Bronze Member
    Messages: 1,226

    i seen that once before, after a very big storm, the mound was about 3' by 3' and a foot high. it was long ago and didn't know what it was until after i seen it. very odd
  4. Phishook

    Phishook LawnSite Bronze Member
    Messages: 1,143

    What type of soil was it?

    Muck can absorb water and swell.

    There's lots of farm ground with muck pocks up here. Odd stuff, you can feel someone jump 30' away.

    Saw a large backhoe sink in about 15 feet while ditch digging.
  5. awm

    awm LawnSite Gold Member
    Messages: 3,354

    glad u still around . sounds like u might have been standing on an alien or mabe alien ****..u didnt feel nothin enter your body did ya.. i done seen that on tv,so u got to be careful.:D :D .
    5 ft and jelly like ,never seen that ray.
    u see another one take a picture.:)
  6. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    Is the water clean?

    There doesn't really need to be a lawn head around there for the pipe to go through that spot. My guess would be that it is a water leak....sprinkler or otherwise.
  7. JasperStorm

    JasperStorm LawnSite Member
    from WA
    Messages: 71

    90% of the time I encounter a "boil" like the one you discovered, it's a buried head. One time, I turned on a system at an entry boulevard to a residential neighborhood and had a mound that looked just like a coffin that was buried too shallow (3'x6'). Although it took awhile to find, I located a Hunter PGP, 18" down, pointing towards China (nice install!)
    Another "boil" in the same general vicinity was a lateral cut through by the Public Works Dept. while installing a traffic signal. Their duct tape stuffed into the end of the 1 1/2" line just didn't hold (guess that they didn't know you're supposed to use primer on duct tape stuffed into lines over 1"!)
  8. KirbysLawn

    KirbysLawn Millenium Member
    Messages: 3,485

    Let's see if I can answer all those:

    The hump was in the middle of the lawn

    No rain for 2 weeks so downspouts are out

    No sprinkler heads that we can find

    Water was "dirty"

    Soil is clay
  9. MJB

    MJB LawnSite Silver Member
    from Wa
    Messages: 2,869

    I've seen this happen several times, each time it was a water line for the sprinkler system that was leaking and pushing up the turf.
  10. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,260

    Sound like a leak in a water line. I've had them were the lawn kind of "floats" on top of th leak. Call the utility company.

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