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  David Benson January 11, 2016 at 11:35pm

  with the wet weather the water table has risen right up to the surface (in my neck of the woods)so a soak away will not make any deference, to see if it will work you dig a test hole 1MT3  with a further hole in the bottom and fill with a measured amount of water (lts) and time how long it takes to soak away. calculate the surface area and multiply it by 50 mm )the rain falling on the lawn) that will give you the total amount of water per hour that has to drain into the soakaway calculate that against the time it takes to soak away the measured amount will give you the size of hole you will need
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  John Somerville January 12, 2016 at 2:14pm

  It will depend on the condition of the soil underneath. If it is clay based and sticks together, then it will retain water in normal conditions, never mind the conditions of this winter.

  I had the same problem with one of my customers. Dig a hole 4ft x 4ft wide, down a depth of at least 4 - 5ft. This is hard work and watch out for pipes and cables. Refill with type 1 and sand alternatively. Use a compactor to compact it. In the last 8 inches, I used grave and sand with weed control fabric.

  That was two years ago, has not flooded since, not even this year.

  Good Luck.
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  Andy Tomlinson March 7, 2019 at 9:07am

  I've recently run into the exact same problem. I've performed the percolation test as described in the other replies. Just wondering how to calculate how many soakaway crates I will need?
  
  I was looking at the soakaway crate sets that are available, normally sold in 1, 1.5 or 2m sets. Would this be ok for a small 150sqm lawn?
  
  Like the sets here https://www.easymerchant.co.uk/soakaway-crates/

  Thanks in advance

  

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