Biofiltration for Storm Water Management
A detention pond is "a constructed stormwater pond that retains a permanent pool of water... at least during the wet season." The main purpose of a wetpond is pollutant removal from runoff. "
As an option, a wetpond or shallow marsh area can be created within the permanent pool volume to provide additional treatment for nutrient removal". Emergent vegetation should be established in shallow areas of wetponds to stabilize settled sediments.
Detention ponds are designed to slow peak flow, releasing water more slowly to prevent flooding.
A retention or infiltration pond collects stormwater and allows the water to soak into the soil.
This infiltration process helps recharge groundwater.
Tree of Heaven (Chineses Sumac)
Tree-of-heaven is a prolific seed producer, grows rapidly, and can overrun native vegetation. Once established, it can quickly take over a site and form an impenetrable thicket. Ailanthus trees also produces toxins that prevent the establishment of other plant species. The root system is aggressive enough to cause damage to sewers and foundations.