Install a Drywell
A drywell is a simple underground system of gravel and pipes that allows stormwater to soak into the ground.
Drywells serve a dual purpose of retaining and cleansing rainwater. If used at the end of a driveway or in a parking lot, sand and gravel in the drywell can capture motor oil and other pollutants, keeping them out of the storm drain system.
Note that before implementing this infiltration technique, it is highly recommended to determine the soil permeability.
Is this practice right for you?
Consult a professional if you're not sure. Also, see our web pages discussing maintenance issues, costs and other factors.