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华阳河流域位于长江下游的北岸,西起湖北盘塘,东至安徽望江,北界大别山外围山岭,南滨长江。包括湖北省的广济、黄梅和安徽省的宿松、太湖、望江五个县属的全部或一部份地区,流域总面积5,326平方公里。流域东西狭长逾150馀公里,北部系起伏的邱陵山地,南部为大片的冲积洲滩,中部是一连串的湖泊和洼地,形状像一条链带。湖泊的面积在中高水位时(吴淞零点以上16.75公尺)达到1,567平方公里,占整个流域面积的29％强,除容纳山洪和圩田排泄量外,有效蓄洪量约有54亿立方公尺,因此它是长江下游除鄱阳湖以外的最大蓄洪区。在流域的中部,筑有百里长堤,北接山地,
Huayang River Basin is located in the north bank of the lower reaches of the Yangtze River, west of Pan Lake in Hubei Province, east of Anhui Province Wangjiang, north of the Dabie Mountains periphery, the southern coast of the Yangtze River. Including Guangji, Huangmei in Hubei Province and Susong, Taihu Lake and Wangjiang in all or part of the five counties in Hubei Province, the total basin area is 5,326 square kilometers. The basin is slender and long, covering more than 150 kilometers. The northern part is a rolling Qiuoling Mountains. The southern part is a large alluvial beach. The middle part is a series of lakes and depressions shaped like a chain. The area of the lake reaches 1,567 km 2 at medium and high water levels (Wutong 0.16 meters above zero), accounting for 29% of the entire drainage area. In addition to accommodating flood discharge and polder discharge, the effective flood volume is about 5.4 billion m 3 It is the largest flood storage area except the Poyang Lake in the lower reaches of the Yangtze River. In the middle of the basin, built a hundred miles long embankment, north of the mountain,