What is the flood control policy for major rivers in China? What are the flood control policies of the Yangtze River and the Yellow River respectively?

At present, the flood control policy of major rivers in China is generally "impoundment and diversion, comprehensive management". For example, the Yellow River's "upper block and lower row, the two sides are divided into stagnation"; Songhua River's "simultaneous storage and discharge, combination of dikes and reservoirs"; The Yangtze River's principles of "storing and discharging at the same time, mainly discharging" and "giving consideration to rivers and lakes, giving consideration to the left and right banks, and coordinating the upper, middle and lower reaches". By building reservoirs in the upper reaches of the main tributaries, taking soil and water conservation measures to control incoming water from entering the river, building dikes in the middle and lower reaches, and carrying out river regulation, the drainage capacity of the river can be fully exerted, and the excess flood volume can be divided by using flood storage and detention areas on both sides of the river to reduce flood pressure and harm. In specific planning, different rivers and regions should focus on their natural geographical conditions, hydrological and sediment characteristics, floods and flood characteristics, social and economic development needs and flood control tasks.