防洪是人类活动中的一个重要内容。由于我国江河众多,防洪问题尤为突出,到目前为止,防洪问题还未得到根本解决,例如,长江、黄河、淮河、珠江等都存在不同程度的防洪问题,特别是广州这样重要的城市所在的珠江三角洲,防洪标准很低,仅为10～20年一遇。为了使众多江河的水利资源达到除害兴利、为 Flood control is an important part of human activities. For example, the Yangtze River, the Yellow River, the Huaihe River and the Pearl River have different levels of flood control problems, especially in Pearl River, where important cities such as Guangzhou are located. However, flood control is still a problem. Delta, flood control standards are low, only 10-20 years once. In order to make a large number of rivers and water resources to achieve the purpose of detriment, for