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Robin,have you thought what effect the gravel up to the surface will have on the stability of the surface immediately surrounding the drain? Have not ever looked at this but strikes me it could lead to this area suffering collapse.Jon
If you do have a clay site then you better have slopes to get rid of surface water. Flat clay sites and you have a recipe for disaster. Royal Mid Surrey!!!!
Neil/Jon, Thanks, very good post. Image is excellent. How often does this need to be done? I mean how long before the hole fills in (seasons)?