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Public Member

Drainage behind a small property

Hi there, I've done a lot of research and still stumped. I want to create more drainage at the rear of a small chalet ... Problem is, if we put pipes in (French Drain), there is nowhere for the pipe to direct the water as we're in a 'row' of chalets. The ground runs down toward the property and at the moment has stones that are approx 20cm deep. There is no pooling at the back of the property but wondered if I should dig a much deeper trench and re-fill with stones (or different grades of stones)... Any thoughts/advice would be very much appreciated.

Cheers, Graham

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  • PRO

    Can you utilise plastic soakaway crates underground an appropiate distance from the building and direct the water back to them?

    • Public Member

      Thanks for your comments, no as the chalet is in a dip so the ground runs down toward the rear of the property.

  • Public Member

    I agree with the soakaway, but I would consider adding a vertical "void" suitable for a sump pump. If the place doesn't flood then maybe only install / use the pump if and when it does - and then some flat fireman's hose would do to take the water somewhere else - storm drain out front perhaps - and the pump can run off an extension lead.

    Of course not making the pump permanent will mean that the flood happens when the occupants are away ...

    • Public Member

      Thanks, Kris, this is more of a preventative measure as no flooding at the moment but you've given me food for thought on your idea

  • PRO

    Couple of comments from experience;

    • Any soakaway needs to at least 5m from building/foundations (Building Control Regs), although you are unlikley to need any approval but on subsquent sale of property could be picked up by Surveyor.
    • You'll need to work out likely capacity for soakaway (whether using crates or gravel) and this will be based on a Field Water Capacity Test otherwise you make a bad problem worse.
    • Don't run 'French Drains' downhill to a neighbours property without suitable soakaway or attenuation tank/pond, otherwise you are open to consquential damages from neighbours.

    If you can't :cough cough: satisfy building control regs you *may* be able to legally justify venting straight into a surface/storm water drain. 

    Who'd of thought ;)

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