永定河是全国防汛的重要河道，也是北京市的防洪重点，历史上水害频繁。经过历代，特别是新中国成立５０年来的不懈治理，目前已初步建立起工程措施和非工程措施相结合的防洪体系，达到了一定的防洪标准。在拦、导、分、滞洪综合作用的永定河防洪工程体系中，堤防工程作为抵御? Yongding River is an important flood control river, is also the focus of flood control in Beijing, history, frequent water damage. Through the ages, especially in the 50 years since the founding of People’s Republic of China, the flood control system that has been basically combined with engineering measures and non-engineering measures has been initially established and has reached some flood control standards. In the block, guide, points, stagnation flood Yongding River flood control system, the dam works as a defense?