Dry wells are precast structures that collect stormwater
runoff and infiltrate it into the ground. Drywells can be
made from concrete, plastic, or other materials and come in
a variety of widths and depths. Once these concrete drywells
are place in a hole in the ground, they will be surrounded
with open-graded aggregated. As water flows into the drywell,
small holes in the side allow the water to infiltrate into
the surrounding soil.