![]() Sedimentation is a naturally occurring process where silt, sand and other debris accumulate on the bottom of rivers, lakes, canals or streams over time. An excessive build-up of sediment can cause a series of issues. Dredges are specialized pieces of equipment that create a vacuum to suck up and pump out the unwanted sediment and debris. We encourage members of the public to submit questions and comments to the Project Team by email, phone, or mail.Table Of Contents – Easily Jump To What You’re Looking For:ĭredging means the process of removing accumulated sediment from the bottom or banks of bodies of water, including rivers, lakes or streams. While hydraulic dredging has the potential to disturb aquatic wildlife that live at and use the site, Fisheries and Oceans Canada is committed to minimizing impacts through the implementation of strict mitigation measures and water quality monitoring processes. The water that drains from the slurry is tested to confirm that it meets water quality criteria to determine whether additional processing is needed before the water is released back into the harbour.The de-watered sediment gets trucked away to a licensed disposal facility.The slurry gets spread across the designated de-watering area for the water to drain.The slurry is transported from the auger through a floating pipeline to a land-based de-watering area.A pump is used to suck up the slurry (mix of dislodged sediments and water) through the auger.It uses a rotating auger (sometimes equipped with cutting teeth) to dislodge the sediments. ![]() An auger dredger will be operated from a pontoon.What are the steps in hydraulic dredging? Hydraulic dredging uses suction to remove sediment (in the form of a slurry), which is then pumped through a temporary pipeline to a location on land where it can be de-watered prior to disposal. Description: Whitby Harbour remediation project
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