As ships get every larger they come up across certain size limitations. The Panama Canal has been a classic example (Panamax) but other sites have defined limtes as well (Suezmax, Chinamax)
Dimension
Example of a Limiting Structure
length of the vessel
lock
width of the vessel
lock
depth below the water (draft)
depth of the navigable channel
height above the water
lowest bridge
Ways to get around a limit:
(1) use high or low tide
(2) dredge the ocean floor
(3) remove contents to lighten the ship
(4) make bigger locks
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