![]() When the bottom is cleared of silt and debris, refill the pond. Remove the silt and relocate it to another area where it can be mixed with soil so it does not recontaminate the pond. Scrape the bottom of the pond with the excavating blade. Often the goal is to return the lake or pond back to its. Do not drain the water into a sewer system or other waterway, such as a local stream.Īllow the pond bed to dry out so the machinery does not become stuck while cleaning out the silt. Dredging is the partial or complete removal of sediment layers rich in nutrients and organic matter. Direct the flow of water toward an area that can accept the water without flooding any roads, driveways or other features. At first, this will be after each pass eventually, you will need to empty the bucket every few passes as you collect most of the silt from the bottom.ĭrain the pond using the pump to expose the bottom surface of the pond. Empty the bucket after it is no more than half full. The barrel scrapes silt as it goes across the bottom, and the water escapes through the lid. Use the machine to drag the barrel back and forth across the pond. Secure the cable to a bobcat, or to the ball of a tow hitch on a truck. Drill a large number of holes in the lid of the barrel with a 3/8-inch to 5/8-inch bit. Do not just deposit it on the bank of the pond silt is light and is not true soil, so it will wash right back into the pond with any rainfall.Īttach a heavy-duty steel cable to a 55-gallon metal drum with a lid. Mix the dredged silt with compost or other soil to re-use the material. The silt will feel soft and mucky, as opposed to the true bottom of the pond, which will be thick mud that gives some resistance when the shovel contacts it. Take care not to dig too deeply unless you desire to increase the depth of the pond past the built-up silt layer. Construction is anticipated to begin in late 2023 and take 9-12 months to complete.Scrape the silt off the bottom of the pond with a shovel and deposit it in the wheelbarrow. In the months ahead the project team will continue to refine the design, seek and incorporate input from the community, and obtain necessary environmental permits. The city was awarded $588,000 in Stormwater Local Assistance grant funding from the Virginia Department of Environmental Quality in 2021 to help pay for the $1.575M project. This project will be partially paid for by the city's stormwater utility fee. The aquatic benches create shallow water habitats for plants and animals. The sediment forebays will be easier to dredge in the future and greatly extend the intervals between dredging of the main pond. adding aquatic benching and plantings around the perimeter of the pond.The dredge carefully controls the proportions of water and other. Then, atmospheric pressure and the water’s weight combine to force the water and material through a pipe and into a pump. It contains a centrifugal pump that creates a partial vacuum. adding two sediment forebays that will trap sediment before it enters the main pond area A hydraulic dredge works by sucking in water and material from the bottom of the waterway.repairing erosion at the two channels that flow into the pond and making them more resistant to erosion.This work will increase the pond’s pollutant removal capabilities, make future maintenance easier and more economic, improve aesthetics, and provide the community with credits to help meet the city’s Chesapeake Bay pollutant reduction targets. In addition to dredging the pond, the department plans to retrofit the pond to meet current specifications. The pond was last dredged in 2011 however, due to budgetary constraints, only a portion of the silt that had accumulated up to that point was removed. This restores the pond’s capacity to hold water capacity and its ability to continue to capture pollutants. Preventing pollutants from reaching Daniels Run improves the water quality in the Accotink Creek Watershed.ĭredging the pond is necessary about every 10 years to remove the silt that the pond captures over time. The stormwater management pond receives runoff from about 135 acres, and much of the sediment is captured in the pond. When it rains, stormwater runoff carrying sediment and debris flows downhill to Ashby Pond. Satoshi Eto, public works program manager, explains the project to dredge and improve Ashby Pond. The deeper pools will enhance water quality for local wildlife and improve the park’s aesthetics for visitors. Removing accumulated silt from the pond will increase the pond’s capacity to slow stormwater runoff and capture pollutants. The City of Fairfax Department of Public Works is developing plans to dredge and upgrade Ashby Pond.
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