Then a high pressure centrifigal pump increases the pressure and volume of effluent so it can be pumped to a spot to deposit or Through a 8" firehose hose that is floated to closest shore line. Long arm that is lowered to the lagoon or lake floor that loosens the substrate enough for a low pressure high volume centrifigal pump to vacuum up and discharge the water silt, sand sludge mix The process includes a dredging barge with a tiller on a Very large lagoons where agitation alone will not suspend solids long enough for pumping.* Lagoons, ponds or lakes with bottoms of sand or heavy sediment that drops out of solution quickly Dense sludge or sediment on lake, pond or lagoon bottoms.Shallow ponds or lagoons such as municipal lagoons where make-up or return water is available.Due to the amount of equipment and complexity of dredging, this is a more expensive option.ĭredging is the method used for small lakes, ponds and lagoons in the following situations: The storm hit the East Coast in October 2012.If an active pond, lake or lagoon is not practical toĮffectively agitate or suspend the silt, sand or solids, then dredging is the answer. Whritenour said this is the first time the town has received FEMA funds designated for Hurricane Sandy repairs. Seventy-five percent of the $350,000 cost will be covered by Federal Emergency Management Agency (FEMA) funds designated for Hurricane Sandy relief. “If the weather cooperates, I think the work could be done much quicker,” Oak Bluffs town administrator Robert Whritenour said on Tuesday. The permit issued by the Environmental Protection Agency gives the contractors, International Golf Construction Co., a month to complete the work. The remainder of the dredge material will be stored at the town highway barn. The rockier dredge spoils will renourish the beaches closest to the Steamship Authority terminal. Some of the finer, dry sand will cover the remnants of much-maligned dredge spoils placed on Inkwell Beach prior to last summer. A large portion of the estimated 6,300 cubic yards of sand and gravel will go to replenish Pay Beach. Packer Co., will dredge the channel to a depth of five feet below mean low water and roughly 200 feet into Nantucket Sound. International Golf Co., in tandem with Island contractors Watercourse Construction and the R.M.
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