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一、永定河泛区的范围 永定河全长680km,流域面积50830km2。永定河泛区是1939年永定河大水在梁各庄决口后形成的,位于永定河下游,上起梁各庄,下至屈家店,左依新北堤、护路堤和北运河左堤,右接北遥堤和增产堤,东西长67km,南北宽一般为6～7km,最宽处为15km,总面积为522.65km2,内有耕地2.656万hm2,人口近20万,主要地
First, the scope of the Yongding River Pan Yongding River a total length of 680km, watershed area of 50830km2. The Yongding River floodplain was formed in 1939 after the Yongding River flood burst at Lianggezhuang. It is located in the lower reaches of the Yongding River, starting from Lianggezhuang and going down to Qujiaodian, on the left by the Xinbei Dam, embankment on the left, and on the left bank of the North Canal, The right next to the North Dyke and stimulation, east-west length 67km, north-south width is generally 6 ~ 7km, the widest point of 15km, with a total area of 522.65km2, there are 26,660 hm2 of arable land, population of nearly 200,000, mainly