Stormwater management - Southwest Washington

Infiltration basin

Infiltration basin is an open basin that holds water while it soaks into the ground.

Biofiltration swale

Biofiltration swale is a flat-bottomed channel where pollutants are removed by filtration, infiltration, and settling.

Detention pond

Detention pond Stormwater is temporarily stored and slowly released through an outlet pipe. Natural-appearing vegetation is common.

Filter strip

Filter strip is a strip of grass along paved areas such as a road or parking lot. Contaminants are filtered out of the water as it flows away.




Dry facilities

Dry most of the time, these facilities contain water during and after rain storms. Water should disappear within three days after the rain stops.

- Wet facilities
- Underground structures and facilities

- Introduction to recognizing facilities on your property