drywell
/ˈdraɪˌwɛl/
noun
- A pit or underground structure filled with gravel or other material, used to collect and slowly release rainwater or runoff into the ground.
- They dug a drywell near the driveway to handle the runoff.
- A drywell helps prevent flooding in low-lying areas of the yard.
- The gardener installed a drywell to manage rainwater from the roof.