By constructing man-made wetlands to act as a natural filters they are able to remove nitrogen and other pollutants from storm water.
Fifteen acres of man-made wetlands have been situated in the center of the racetrack to deal with runoff issues that could impact the watershed.
If the system is not manipulated to provide the area with a constant water supply, she said, the man-made wetlands will quickly revert to their natural state.
Natural woodland and a man-made wetland give habitat to a few of the smaller local species such as turtles and birds.
The garden consists of natural areas, man-made wetlands, and three small rock gardens.
Natural woodland and man-made wetlands house a few smaller local species like turtles and birds.
About one third of the garden is covered by beech forest; the remainder contains a mountain meadow, man-made wetlands, and a rock garden.
They will breed in restored and man-made wetlands.
Native species of frogs have taken advantage and reclaimed residents in the new (man-made) wetlands and lakes.
When combined with man-made wetlands, it creates a self-renewing Passive Treatment System.