Retention basin

[4] In urban areas, impervious surfaces (roofs, roads) reduce the time spent by rainfall before entering into the stormwater drainage system.

Retention ponds are often landscaped with a variety of grasses, shrubs, and/or aquatic plants to provide bank stability and aesthetic benefits.

[5] In some areas the ponds can attract nuisance types of wildlife like ducks or Canada geese, particularly where there is minimal landscaping and grasses are mowed.

Such predators tend to hide in the cattails and other tall, thick grass surrounding natural water features.

Proper depth of retention ponds is important for removal of pollutants and maintenance of fish populations.