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drainage problem

hey guys i have a little problem with one of my customers gardens. The garden is built below sea level and the area is considered as high risk flood area, the garden suffers from heavy waterlogging after one small shower, the only idea that i can think of is digging several drainage holes to a 2 foot depth, 6x6inches in area and filling with gravel then re turfing over then and holow coring the lawn and filling with 100% sand, any other ideas ? 

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  • Is moving not an option?

    You need to get the water up to get it out of the garden? Where is the garden?
  • PRO

    Can we have some pictures of the site? 

  • I live in  llandudno Junction, The area they built on used to be the overflow for water after heavy rainfall, but the local govement decided , yes its safe lets build here =/ . Theres no way of geting the water out of the garden as its below sea level if i dig to about 4 foot its lovely water, the issue is the extent of ground clay, removing this is not an option do to the cost and building a hard surface would just increase the flooding, i have looked at bark but the owner has dogs so they would just dig it up so the grass is the only option i can think of, its just the water issue, its not that it retains the water, it doesnt penetrate the surface layer so thats why i thought of the drainage hole and the holow coring as its becoming a mud bath everytime i run over it with the mower and anothe issue its semi shade =/

  • Try getting a post corer, core a few trial holes as deep as possible, fill with pea gravel top with 150mm soil then turf see if this works then you can do holes as required.

    This method does not make a total mess of a lawn, acts like a soak away, helps to get through compacted clay and if it does not do the job it as not cost a fortune to try out.  

  • I will get some picks, Lawn lover thats basicly the idea i was thinking of, its the only way of dispersing the surfacw water quick enough.

  • Ive had a similar situation, thought not bellow sea level, in yorkshire - Garden in a hollow over 4ft thick clay layer - held water for days after any rain, and this year was so bad the water stood for 2 months and killed the grass.

    The solution was to use a post hole borer to get 2 6ft holes, lined them with plastic drainpipe with only the top 18inches perforated (this being the area I would like drained), The whole pipe was then filled with 25mm course aggregate, and then capped off with plastic sheet 4 inches bellow the soil surface.

    Its worked a treat in this situation - Hopefuly it could work for you.

  • Sump hole and a pump to pump the water up and away,

  • I'd go with that suggestion of a sump and sump pump into storm water system - only solution that will get the water away
  • Surely this is physics, not gardening. If problem is as you describe and you are below sea level, your water level will adjust with the tide. Dig a hole at low water and should be dry, but when tide comes in will fill, and level will vary with the moon. Only solution would be to tank whole garden and instal pump.?.

  • Well the drainage pipes with pea gravel i think would do the trick, David did you have to lay new turf over the existing one or did you just over seed it ? because to be honest the turf is the same its scarce in mmost places, really neeeds a new lawn.

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