洪泽湖位于江苏省西北部,是我国五大淡水湖之一,正常水位12.5米(废黄河零点),水域面积2090平方公里,水容量31亿立方米;洪水期间水位14.5米,水域面积达3050平方公里,水容量82.5亿立方米(表1)。湖底高程+10.0～+11.0米,高出东部里下河地区5～9米。因此;洪泽湖是苏北平原 Located in the northwest of Jiangsu Province, Hongze Lake is one of the five largest freshwater lakes in China with a normal water level of 12.5 meters (zero waste of the Yellow River), a water area of ​​2,090 square kilometers and a water capacity of 3.1 billion cubic meters. During the flood, the water level is 14.5 meters and the water area reaches 3050 Sq km, water capacity of 8.25 billion cubic meters (Table 1). Elevation of the lake + 10.0 ~ + 11.0 meters, higher than the eastern river area 5 to 9 meters. Therefore; Hongze Lake is the northern Jiangsu plain