What does floodplain mean everyone in it has to be demolished?

Flood storage area is the use of low-lying areas to store more than the safe discharge of the river excess flood water. Flood storage area mainly plays the role of storing flood water to reduce the flood peak, in order to reduce the pressure of flood water on both sides of the river embankment. It is necessary to implement progressive relocation of residents in the floodplain.

Housing demolition and relocation refers to the demolition of existing houses on construction sites by construction units or individuals due to the needs of national construction, urban renovation, cityscape rectification and environmental protection.