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Water logged garden at back of house

  • 17-08-2008 6:44pm
    #1
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭


    Garden slopes back up from the back door and is c 150 feet in length.

    Back garden wall has a large green area behind it and the water is 2 feet deep at the back of the wall as the green area slopes up as well.

    Am considering digging a trench all the way across the garden about 40 feet back from the house,
    filling it with crushed stone and finish it off with a decorative gravel over a permeable membrane.

    Will run a 4" wavin pipe from a manhole in the trench to drain into the existing sewer at the back of the house.
    The manhole will be vertically lined with a perforated 'land-drain' pipe of sufficient diameter to take a submersible pump c/w a float.

    Would welcome some suggestions on this, including the following:

    how deep and wide would you make the trench?
    <: there is access for small digger so...>
    what size crushed stone?
    What slope would you put on the wavin. 1:100 as it is water only?

    How far below the invert level of the wavin at the manhole would u dig the trench? 12/18" ?

    Thanks.

    [May not be C+P issue so move if needed.]


Comments

  • #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    Firstly I would forget discharging any ground water into an existing piped drainage system . You will overload it . You will be held responsible for inviting water which the ground previously held onto , safely away from built property but which now you have invited into peoples piped drainage systems .

    What you MAY CONSIDER - with professional civil engineering input

    along your rear boundary

    1st

    1m wide x 3m deep trench backfill with dense impermeable marl - to block run of from outside your site from entering

    2nd

    another 1m x 3m trench with large aggregate fill and geotextile wrap to keep fines and silts out . if you are lucky - there may be a permeable sub strata to divert water downwards to .

    Needless to say this is no "suck it and see" exercise . Expert professional advise and LA consultation , perhaps even planning permission may be required .

    .


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