Flickr user lagohsep
When a waterway is deepened, the muck removed is used to build up land.
Update January 23: The Savannah Morning news has written a column calling the opposition to using the Jasper site as dredge spill zone "a case of damn the facts, full speed head."
In short the paper tries to draw the dredging scenario as a win-win and the only reason worth slowing it down is to promote the Port of Charleston.
Updated 3:30 p.m. January 21: The South Carolina Radio Network has audio of state Sen. Tom Davis taking Georgia to task for proposing to dump dredge spoil on the Jasper Ocean Terminal site.
"Actions speak louder than words," Davis says.
Reported January 21: South Carolina officials appear to have generally taken offense at an Army Corps of Engineers plan to dump dredge spoil onto a proposed Jasper County port site.
But the Corps is saying they're at a loss as to why some are opposed, they say the spill (which would come from deepening the Savannah River for larger ships) would help raise the Jasper site above 100-year flood levels and help shave hundreds of millions of dollars of the port's price tag.
Bluffton Today has a nice rundown on the evolving debate; take a read here.