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What is a soakaway system and what should be its size?

A soakaway is simply a hole dug into the ground, filled with rubble and coarse stone which allows surface water to percolate back into the earth close to where it falls.

It is a covered, porous-walled chamber that allows water to slowly soak into the ground (that is, percolate), dissipating into the groundwater.

A deep hole used for drainage, where rainwater and other wastewater drains directly into the ground, without connection to any mains drainage or sewerage pipes.

Sizing the Soakaway

Once you have calculated your effective roof area, use the table below to work out how many crates you need:


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