Earth-moving trucks are dredging the narrow, sewage-filled river, and garbage trucks pass through three times a week.

To restore coastal habitat, for example, the report advises using strategic dredging and river diversions to rebuild the rapidly disappearing wetlands of the Mississippi Delta.

The depth of the river is maintained by dredging.

Authorities are dredging a channel to allow river traffic to resume.

Tan Bin, official of Zhuzhou Maritime Department said, "We will dredge a channel 60 meters wide and one and a half meters deep to make sure 300-ton cargo ships can pass down the waterway."