The decant water is thenreturned to the lake either by gravity flowor a pumping system. The slurry mixture is pumped into a strategically placedgeo tube where it contains the organic andinorganic dredged materials while releasing the water. Geo textile tubes(geo tubes) are often the preferred methodfor dewatering in residential communities,golf courses and city parks. When evaluatingfuture projects, hydraulic dredging contractors must always determine what willhappen to the material at the discharge siteand how far the material must be pumped.Often circumstances such as inadequatespace, permitting or aesthetics will dictatethe dewatering method.
The size of the dredge, pump system and material agitation method are all project specific andmany times require custom configurations.Dewatering of the slurry can be handled in a variety of ways. Hydraulic dredgescome in all shapes and sizes from largeocean going dredge ships all the way down to small pontoon mounted, hand dredgessuch as the one described in this article.When it comes to hydraulic dredging thereis no “one size fits all” dredge. The mixture of organicand inorganic materials along with wateris referred to as “slurry” and is pumpedthrough the pipeline to a strategically located area for dewatering. Sometimeshydraulic dredging is also referred to as“suction dredging”. Just as the name implies, hydraulicdredging is the use of water to transport theaccumulated material through a temporarypipeline, using a pumping system to basically “vacuum up the muck”.
But dredging doesn’talways require draining the pond or lakeand destroying aquatic environments.There are basically two types of dredgingwhen it comes to removing silt, sedimentand other organic and inorganic accumulation from ponds, lakes, streams and otherwaterways mechanical and hydraulic. Land and Water - Taking the DRED out of Dredging.pdfĭredging is always such a “dreaded”word. The word dredging typicallyinduces images of heavy machinerycrushing the surrounding landscape, roadways that are rutted and muddy, and theodor of organic material that can’t be forgotten soon enough.
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