What do you mean by "flood storage and detention area", "flood plain area" and "flood discharge area"? What is the function of flood storage and detention area?

Flood storage and detention areas refer to low-lying areas and lakes located on the backwater side of river embankments for temporary flood storage and detention, as well as low-lying areas and lakes for temporary flood storage and detention outside the backwater surface of river embankments, including flood diversion outlets. Flood storage and detention area is an important part of river flood control system. The overall loss of flood disaster can be reduced to the maximum extent by storing excess flood in time and reducing flood peak.

Submerged area refers to the area that has been submerged, that is, the areas on both sides of rivers and lakes and Zhou Haibin that are easily submerged. An alluvial plain or flood plain formed by floods in history. Submerged area refers to untreated rivers, reservoirs and other engineering facilities, which directly or indirectly affect the surrounding areas during the flood season, causing serious floods.

Flood discharge area refers to the 1 area between dikes or embankments on both sides of the river for flood discharge. In flood-prone areas, the flood flows between two dikes. Some residents are engaged in agricultural production activities, while others live there.

Flood storage and detention area is an important part of river flood control system and an effective measure to ensure the safety of key flood control and reduce disasters. In order to ensure the safety of flood control in key areas, it is necessary to develop conditional areas into flood storage and detention areas and store flood detention water in a planned way, which is realistic and economically reasonable for flood control planning in river basins or regions. In order to preserve the overall situation, it is also necessary to sacrifice local interests to make overall consideration. Generally speaking, it is necessary and reasonable to maintain flood control safety in key areas and make local losses.