Answer
What is a soakaway?
An underground pit that lets collected rainwater soak away into the ground.
In short
A soakaway is an underground pit, filled with rubble or modular crates, that collects rainwater and lets it soak slowly into the surrounding ground. It is a simple way to deal with run-off on site rather than to a drain, as long as the ground drains well enough and it is sized correctly.
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