On Sunday night the Ross River Dam was at about 250 percent of its capacity and it's flood gates had to be opened in to prevent the structure from collapsing.
But the Maeslantkering is just one part of a massive, interlocking system of water controls known as the Delta Works — the most sophisticated flood prevention project in the world.
The UK's environmental agency, which monitors the North Sea's tide levels, river flow, and weather, gathers data on a daily basis to determine whether to open or close the barrier.
Many people have decided to sit out the storm in their homes, confident in the work done and the billions spent on the levees and new flood barriers to prevent the city from being flooded this time around.
Ray Camp of the St. Charles County Office of Emergency Management says levees and dikes north of the confluence of the two rivers are causing those rivers to seek out new channels.
Zhu Dongtie, head of Hunan's Department of Water Resources, said the embankment has not been used to prevent flooding since 1996, and it was built to a much lower standard than the dike.