Constructed wetlands are engineered, man-made ecosystems specifically designed to treat stormwater runoff by optimizing the biological, physical, and chemical processes that occur in natural wetland systems. Constructed wetlands should be planted with emergent vegetation, whose selection should be appropriate to project goals to support animal life, as well as conduct important hydrologic buffering and water purification functions. Constructed wetlands can provide effective, economical, and environmentally-sound treatment of stormwater runoff, as well as serve as wildlife habitats.