Does anyone know anything about gardening?

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ColinTheBald in reply to @hugo7

An awful lot depends on what soil you are on. If it's clay you'll just have an overflowing pond in a wet winter. A starting point would be to work out the area of paving and multiply by 50mm (a day of extremely heavy rain) to work out the volume of water you could be dealing with.

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hugo7 in reply to @ColinTheBald

Soil type?

A mixture of the normal London clay soil you'd expect and the sort of modeling clay you used at school.

Sounds like the hole would need to be deeper still. Can you buy dwarf weeping willows I wonder..?

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ColinTheBald in reply to @hugo7

You can buy what are claimed to be dwarf weeping willows, but I wouldn't if you value your foundations. They're also sods for surface rooting and popping up all over the garden if a section of root gets severed.

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