More often than not, a bilateral deal unblocks one trade route only to silt up its tributaries.
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But by the time it was completed in 1598, the Guadalquivir River had begun to silt up, causing all New World trade to move to Cadiz and the building became a rather opulent filing cabinet instead.
Some recalled a warning given by one of China's most famous critics, Huang Wanli, before his death ten years ago that the dam would silt up the reservoir basin and sooner or later have to be blown up.
Ian Barclay, a project manager on the silt scheme, said it would be good to add the extra barrier to stop the silt building up again so quickly.
Staffordshire county council said the divers went into a culvert underneath the road and found blockages created by debris and a build up of silt and mud.
The Canal and River Trust said silt would be "hoovered" up from the bottom of the docks.
To be sure, the dam has helped Egyptian farmers irrigate year-round and has prevented periodic flooding, but it has also deprived the Nile delta of nutrient-rich silt, which instead just piles up behind the dam.
You don't have the border barge traffic kicking up the sand and the silt.
Dig up, suck up, that sand and silt then separate the heavier cassiterite from the lighter sand and silt.
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The cassiterite makes up some fraction of the standard sand and river silt there.
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The theory is relatively simple: Seawater and freshwater, filtered to remove silt, are fed into pipes which lead to a membrane system, made up of spiral coils to maximize surface area.
Work is slow along the 525-foot-wide route to Umm Qasr's grain elevator, where the Dredge Carolina chews up the mud with its 3, 000 horsepower cutter and suctions out the loosened silt.
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