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What exactly are you trying to do? your original post asks about soakaway testing. Looks like you are either building a new house or adding an extension if so going to need more info to help. If its just a drain for a patio the answer will be different to a drain for a multi storey carpark.
kojakb
I also had it in my head for some reason this was waste water off a garage roof , not a new build ..lol see what you local area building control officer says ...
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