Detention (dry) ponds are basins in which outlets have been designed to reduce discharge rates or in some cases, to detain stormwater for a set time to allow particles and associated pollutants to settle out. Detention ponds provide water quantity control. Extended and Enhanced Extended Detention Ponds provide water quality control in addition to water quantity control.
Mason has several detention ponds including Krasnow Pond, Braddock Pond and Roanoke Pond.
Retention (wet) Ponds are ponds that have a permanent pool of water throughout the year. These ponds treat incoming stormwater runoff by allowing particles to settle and allow biological uptake and microbial activity to take up nutrients.
Mason Pond and Prince William Pond are retention ponds.