The heavy sewage flow into the canal required regular dredging to keep the waters navigable.

The Cam is subject to frequent silting, requiring regular dredging to accommodate ships of greater than 5,000 tons.

Engineers say silting from the river may choke the port and require constant and costly dredging.

The jetty has provided stabilization to the shoreline along the inlet, but requires frequent dredging.

Spits often form around the breakwater of artificial harbours requiring dredging.

To accommodate the passage of ever larger ships the strait has required continued dredging and deepening.

Habitat and flow alteration cause siltation and sedimentation issues which can require dredging.

The only viable alternative is at Luderitz, a fishing village 250 miles down the coast, where a natural harbor would require dredging and construction.

To build piers closer to the port's seawall will require extensive dredging.

Ms. Kelley said that the company wanted to use existing, active ports and was not proposing a new harbor, which would require dredging.