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Drainage issues

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  1. #1
    Senior Member
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    Default Drainage issues

    G'day all,
    My property has some overland drainage issues. My block is benched into the land and has had problems with water run off.

    So far I have fitted 3 drains down the side of my house and just had a bobcat level my yard. I then laid topsoil and got the yard to fall to two other drains I installed in the yard. All the drains are connected to storm water. The other night we had 52mm of rain fall in 2 hours and the drains coped with the influx of water.

    I have one part of the yard which still floods. Unfortunately it is in the garden and also next to the garden shed, so the shed ends up full of water. I have dug down and located the storm water pipe and intend on installing another drain. The biggest problem I can see is by installing this drain in the garden, Its going to get blocked with leaves and mulch.

    What I am thinking of doing is installing the pit 100 - 150mm below the top level of the garden then lay gravel over the top. Im assuming that this will allow the water to drain away relatively quickly without the drain blocking up. Am I on the right track?

    The pits I have been using are similar to this one and available from bunnings.

    Cheers
    Steve

  2. #2
    Senior Member
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    Default

    This photo just shows how high the retaining wall is at the back. The land isnt much lower than behind. The problem area is down the right hand side pathway.

    <a href="http://s97.photobucket.com/albums/l223/ausyuppy/?action=view&current=DSC_0068smal.jpg" target="_blank"><img src="http://i97.photobucket.com/albums/l223/ausyuppy/DSC_0068smal.jpg" border="0" alt="Photobucket"></a>

    The water builds up in the garden and ends up rising over the footpath towards the house. I plan on putting the drain on the left hand side against the shed and retaining wall.

    <a href="http://s97.photobucket.com/albums/l223/ausyuppy/?action=view&current=DSC_0071small.jpg" target="_blank"><img src="http://i97.photobucket.com/albums/l223/ausyuppy/DSC_0071small.jpg" border="0" alt="Photobucket"></a>

    Cheers
    Steve

  3. #3
    GeoffW1
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    Sydney Australia
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    Default

    Hi Steve,

    All that looks very good and should work. I don't think you will need to sink the lid of the pit below level, as I have 2 of these things which don't really block up much. If you have a look every day or 2 and move stuff off the grate, that is enough. You could go a bit further and secure a bit of plastic mesh, like gutterguard, over the top with cableties.

    Cheers

  4. #4
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    Default

    the way your levels are there i would be more inclined to put a strip drain along the length of the path, level with the path.
    And possibly put an edge slightly higher to retain the garden

  5. #5
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    Default

    Its hard to see however the lowest point is in the corner of the shed slab and the retaining wall, so the water builds up from there, thats why I was considering putting the drain there.

    When the water builds up the water ends up going into the sewer drain that you can see on the path and its always surrounded by bits of mulch etc. Thats why I was looking at some sort of filter to block the crap.

    Down the side I have used fly screen mesh to stop the small stones goign into the drain and they sometimes get blocked up with silt / leaves etc.

    I did consider one of those meter long strip drains, but it would have to be 50mm lower than the path to catch the water before it got as high as the slab the shed is on as it falls away from the house.

    Cheers
    Steve

  6. #6
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    Default

    Hi mate, your on the right track however in the spot you are talking about I would personally install a larger pit, you can buy a little plastic pit about 300mm square by 300mm deep which are relatively cheap and install this with a piece of stainless mesh that fits diagonally in the pit if you know what I mean to act as a trash screen to catch any leaves, mulch etc that may block the stormwater pipes further down. To clean simply remove the trash screen and shake it off.
    Plumbers were around long before Jesus was a carpenter

  7. #7
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    Default

    Hi mate,
    I followed your advice and bought a 260 x 260 x 280mm deep. Its the one in the piccy below. I installed it about 50mm below the top of the slab and slightly lower than the dirt level of the garden. Im going to install rocks around the pit, but not over it to try and eliminate mulch ending up in the drain.



    I had a look for the mesh you were talking about, but couldnt find any. I assume you mean diagionally to be similar to those leaf eater down pipe things they use for water tank supplies?

    I will add a photo of the job when I finish it off.

    Cheers
    Steve

  8. #8
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    Default

    Thats exactly the pit i was referring to! Yeah place the mesh into the pit on the diagonal to stop rubbish getting into the pipe. Call into any stainless or aluminium fabrication place, they may even give you an off cut but get it larger than you need so you can trim it to the exact shape.
    Plumbers were around long before Jesus was a carpenter

  9. #9
    Senior Member
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    Default

    Hey wonderplumb,
    Still havent got around to getting the mesh, but I have finally got some photos to show the finished product.

    The Level of the garden was at the top of the shed slab, as you can see now the level is roughly 80mm lower. Hopefully the aggregate around the drain should help with water run off from the slab and hopefully eliminate water building up and allowing mulch to float into the drain.

    Cheers
    Steve




  10. #10
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    Default

    Good stuff mate.
    Plumbers were around long before Jesus was a carpenter


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