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一、同心圩今昔对比江苏省昆山县同心圩是太湖湖东水网圩区中具有代表性的联圩,总面积6.25平方公里(9380亩),圩形长方,南北长3.5公里,东西平均宽1.8公里。综合治理前,可耕地面积6300亩,占总面积的67％,水面积940亩,占10％,其余为村庄、道路、圩堤等。圩内地势低洼,田面高程为2.3～3.3米(吴淞零点),低于1954年洪水位1.7～0.7米;土质多为重壤土,透水性差;全年无霜期210～220天;
First, the Concentric Fair Comparison Kunshan County, Jiangsu Province Concentric Wei Fair is Taihu Lake in the eastern polder area in the polder area with a total area of 6.25 square kilometers (9380 acres), Fair-shaped rectangular, 3.5 km long from north to south, east-west average 1.8 km wide. Before comprehensive treatment, the arable land covers an area of 6,300 mu, accounting for 67% of the total area. The water area is 940 mu, accounting for 10%. The rest are villages, roads and levees. Low lying in the dike, the surface elevation of 2.3 to 3.3 meters (Wusong zero), lower than the 1954 flood 1.7 to 0.7 meters; soil mostly heavy loam, poor water permeability; the annual frost-free period of 210 to 220 days;