Principle of sluice in two rivers and four lakes

The sluice of the two rivers and four lakes is a very important water conservancy project, which is used to control the flow of the two rivers and the fluctuation of the four lakes and ensure the safety in flood season. The sluice consists of five sub-sluices and four control sluices.

Among them, the principle of sluice is to separate the flow direction of Yangtze River water and Dongting Lake water by controlling the amount and direction of circulation, so as to realize the purpose of separating the two rivers. The principle of controlling sluice is to control the fluctuation of lake water level. When the water level of the lake rises due to heavy rain and other weather, the excess water can be discharged by lowering the sluice to keep the water level stable.

Through such control, the interaction between river water and Dongting Lake water in flood season can be effectively avoided, the occurrence of natural disasters can be avoided, and the safety of people's lives and property can also be guaranteed. This is a very important water conservancy project.