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Thanks again. Yes, we’ll have decorative gravel on top. So it’s clay soil at the base. Platform of type 2 above (edged by sleepers or similar to retain the platform). Then gravel top layer. Water should quickly drain from gravel onto Type 2 but I worried that if type 2 takes forever to drain...

Thanks, robinbanks. Installing drainage will be very costly and that end of the garden is not near a drain to discharge water to, so we’d have to dig up a lot of other ground, including concrete areas to connect even if possible. His idea is to raise the height, and effectively create a platform...

We are converting the back area of our lawn to a veggie plot with gravel paths and raised beds. The ground in our area is dense London clay and our lawn can be home to several ponds after heavy, persistent rainfall. I think a combination of a relatively high water table and very very very slow...