Dry well

A dry well or drywell is an underground structure that disposes of unwanted water, most commonly surface runoff and stormwater, in some cases greywater or water used in a groundwater heat pump. It is a gravity-fed, vertical underground system that can capture surface water from impervious surfaces, then store and gradually infiltrate the water into the groundwater aquifer.

For the nuclear containment structure, see Containment building ยง Boiling water reactors.

Such structures are also called a dead well, absorbing well, negative well and soakaway or soakage pit in the United Kingdom or a soakwell or soak pit in Australia.

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