10/10/2023 0 Comments Cost of dredging a detention pond?![]() Because they retain water for a longer time, wet ponds are also called retention ponds.īoth wet and dry ponds remove sediment, phosphorus and other pollutants. Wet pond water levels can increase dramatically as a result of rainstorms, like dry ponds. Wet ponds frequently have smaller pools, plants and a wetland area. They remove pollutants by allowing sediment to settle as water slowly moves from one end of the pond to the other and through biological uptake, as plants absorb excess nutrients. Wet ponds, on the other hand, maintain a permanent pool of water throughout the year. Because they detain water for a brief time before allowing it to flow out, dry ponds are also called detention ponds. They hold water for 48-72 hours to allow sediment and pollutants to settle out. When it rains, the pond fills with water. Between rain events, a dry pond looks like a large, grassy low area. Dry ponds control peak flows of runoff, help improve water quality and lessen the effects of erosion. How can a pond be dry? A dry pond is designed to hold water for a short period of time before allowing the water to discharge to a nearby stream. There are two general types of stormwater ponds: wet ponds and dry ponds. Along with riparian buffers, rain gardens and other infiltration practices, they are an important tool to help protect local streams. Stormwater ponds slow the flow of water, filter pollutants and improve stream health. Sediment (soil), excess nutrients and other pollutants are carried downstream, negatively affecting aquatic life. If unmanaged, stream banks begin to erode under the increased flows. Streams will rise to new peak flows (the maximum amount of discharge after a rain or snow). Why control runoff? When new roads and buildings are built, the increased amount and velocity of runoff can damage nearby streams. Today, there are at least 2,162 stormwater ponds in Fairfax County 1,325 are maintained by the county and the remaining ponds are privately maintained. ![]() In Fairfax County, the construction of stormwater ponds became a requirement for new development in the 1980s. ![]() Stormwater ponds capture, control and filter runoff from roofs, roads and parking lots before it enters our local streams. ![]()
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