Stormwater Facility Types

There are many different types of Stormwater management facilities used to control stormwater and reduce the harmful effects it can cause, such as flooding and poor water quality. They help maintain the ecological integrity, quantity, and quality of our water by releasing stormwater slowly and/or by reducing the amount of stormwater. Some frequently used types include:

Wet Pond

Wet ponds should contain a permanent pool of water that is a minimum of 3-feet deep. Their outlet structure is above the surface of the water, so the pond should stay full most of the time. Stormwater only discharges from the pond when the water level rises over the outlet as a result of runoff from a rainstorm.

Dry Pond

A surface area with a runoff storage area that is normally dry during dry weather conditions, but stores stormwater as it rains. Such a detention facility does not have a permanent pool of water and the entire volume of the runoff storage area is utilized to store stormwater runoff.

Bio-Filtration Practices

Typically broad, grass-covered ditches with a relatively flat grade. These are constructed where stormwater flow rate control is not necessary. These provide filtering and infiltration of stormwater runoff back into the ground.