Hopper dredges are most effective when excavating loose, unconsolidated materials that form shoals following the completion of initial dredging.ĭuring operations, hopper dredges travel at a ground speed of 2 to 3 mph and can dredge in depths ranging from 10 feet to more than 80 feet, with dredging achieved via progressive traverses over an area. Hopper dredges are primarily used for maintenance dredging in exposed harbors and shipping channels, namely where traffic and operating conditions negate the use of stationary dredges. Small Class – Capacities of 500 to 2,000 cubic yards.Medium Class – Capacities of 2,000 to 6,000 cubic yards.
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