Navigational dredging is done to deepen bodies of water to allow for the safe and functional navigation of crafts through the marina.Capital dredging is for new channels or berths and construction while maintenance dredging is to keep existing channels and berths functioning properly. They fall into two basic categories, which are capital and maintenance dredging. There are a number of different types of marina dredging that are in common use today. In the UK, the Marine Management Organisation oversees dredging and filling. In the United States, those authorities are the Environmental Protection Agency and Army Corps of Engineers. These materials and land areas may have an added cost outside of the cost of dredging.īecause of its importance, this process must be overseen by the proper authority to be done legally. Transport units or systems for the sediment are additional required materials, as is a designated fill site for the material to go into. One important aspect of the process is “filling,” or the depositing of sediment elsewhere. A survey boat to assess the size and shape of the area to be dredged is also a vital part of the process. The equipment involved in dredging is, of course, the main dredging vessel, but also includes workboats such as a navigational tug, crew boats, and a fuel barge. In the case that the sediment is collected, it is then transported to the filling area and deposited.The sediment is collected in containers for transportation or is directly transported to the filling area.The vessel moves at a steady pace to scrape the dredge along the bottom of the marina, loosening sediment.The dredge itself, usually a large, flat blade or panel but in some cases a hydraulic system, is lowered to the sediment layer.The dredging vessel is positioned above the designated work area.
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