Retention basin

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

This slow release mitigates the size and intensity of storm-induced flooding on downstream receiving waters.

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.