The slurry is drawn up by a pump that passes the material along to a floating pipeline and deposited outside the navigation channel.
High velocity water jets in the suction head agitate and loosen the material. The suction head, about as wide as the hull of of dredge, is lowered to the face of the material to be removed. The dredge operation is basically simple. They "vacuum" sand and silt accumulated on the river floor. The Dredge Hurley is tasked with this mission and operates 7 days per week and 24 hours per day from June through November.ĭustpan dredges like the Dredge Jadwin are unique to the Mississippi River. The Mississippi River channel is maintained from river mile 599 to 954 to a depth of 9 feet and 300 feet in width.
Cutterhead dredges are used mostly in river harbors to remove harder materials from the bottom. Several commercially operated cutterhead dredges are also available for service with the Corps. High velocity water jets loosen the material which is then drawn up by powerful pumps, shot through a floating pipeline and deposited up to 1,000 feet away. A suction head - over 50 feet wide - is lowered to the soft river bottom. A dustpan dredge operates like a huge vacuum cleaner. The flagship of the Corps' river dredging fleet is the Hurley, a 300-foot-long dustpan dredge capable of removing over 5,000 cubic yards of silt from the river bottom each hour. High velocity water jets loosen the material which is then drawn by pump as a slurry through the dredge pipe and floating pipeline where the material is deposited outside of the navigation channel.
The suction head, approximately the width of the dredge, is lowered to the face of the material to be removed. This type dredge is used on the Mississippi River. The Dustpan Dredge is like a large vacuum cleaner.
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