Stormwater management - Southwest Washington

Infiltration basin

Above shows a dry infiltration basin. Unlike a detention pond, an infiltration basin has an underground structure that helps water soak into the ground. Below is a good basin shortly after a rain storm.

Infiltration basin

 

 

FACILITIES

Infiltration basin

A stormwater infiltration basin holds runoff and lets it soak into the ground. The basins are open facilities with grass or sand bases. They can either drain rapidly or act as permanent ponds where water levels rise and fall with stormwater flows. Infiltration facilities can be designed to handle all runoff from a typical storm but could overflow in a larger one. Since the facility is designed to soak water into the ground, anything that can clog the base will reduce performance and be a concern. Generally, infiltration basins are managed like detention ponds but with greater emphasis on maintaining the ability to infiltrate stormwater.

Signs that maintenance is needed and a checklist for maintaining the facility including how to fix problems.