一、南汇地区河道形势南汇地处长江三角洲顶端,河网纵横交叉,属江南水网地区。全县境内有市级河道2条,县级河道30条,还有500多条乡村级河道。河道密度达10.7km/km~ 2。河道治理和管理的任务相当繁重。建国以来,南汇与全国各地一样,国家和集体投入了大量人力物力财力,进行河道整治。南汇地区的河道整治是基于以下几个方面的治理要求进行的:1.防汛抗洪:南汇濒临大海,是上海东大门,防汛抗洪排涝任 First, the Nanhui River channel situation Nanhui is located at the top of the Yangtze River Delta, the river crosswise, is a water network area. The county has 2 municipal rivers, 30 county-level rivers, there are more than 500 village-level rivers. River density of 10.7km / km ~ 2. The task of river regulation and management is rather heavy. Since the founding of the People’s Republic of China, Nanhui, like all parts of the country, has invested a great deal of manpower, material resources and financial resources in the state and in collectives to rectify rivers. Nanhui area river improvement is based on the following aspects of the governance requirements: 1. Flood control and flood fighting: Nanhui verge of the sea, is the Shanghai Dongdaemun, flood control and flood control any