We have a paved patio that borders and drains on to the lawn. After any meaningful rain the lawn becomes boggy and takes an age to dry out because the soil is mainly clay. How do I install a soakaway?
Firstly you need to catch the water before it reaches the lawn. Do this by installing lengths of plastic drainage channel flush with edge of the paving.
Because your soil is clay a traditional rubble filled hole will not be an adequate soakaway. Beg some plastic milk or beer bottle crates, wire them together to form a cube, wrap it in horticultural ground cover fabric and bury it in a pit, running a rainwater pipe from the middle of the crates to the outlet of the drainage channel.
The large empty space created by the crates will hold surges of water that will slowly be absorbed by the surrounding clay.
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