rises every morning and order to block the high tide when at the end of its house. this mobile dike protects an area that has sunk by more than three meters in a hundred years due to excessive pumping of water from the water table. beginning in one thousand nine hundred twenty is chinese all floridians have been measuring the steady sinking of the city. to study the phenomenon shanghai established a ground subsidence institute the only one of its kind in the world. lucian and. africa say yes until the one nine hundred sixty s. too much ground water was removed in shanghai. only this led to