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小洋口闸位于如东县西北部,1955年7月建成,共9孔,净宽72米,集拼茶运河、南零河、岔洋河及东、西岸河水量排泄入海,担负如东、如皋、海安三县192万亩农田的排涝、排咸、兼顾通航的任务,年排水量一般为4～6亿立方,是一座中型排涝、挡潮闸。该闸港外滩涂以每年25～30米的速度淤长,保港任务艰巨。1955年10～11月的
Xiaoyaomen gate is located in the northwestern Rudong County, completed in July 1955, a total of 9 holes, a net width of 72 meters, set the Pope tea canal, Nam Po River, Cha Yang River and the East and West Bank of the river excreted into the sea, responsible for Rudong, Rugao, Haian three counties 192 million mu of farmland drainage, Pai salty, taking into account the task of navigation, the annual displacement is generally 4 to 600 million cubic meters, is a medium-sized drainage, tidal gates. The gate of the Bund coated with 25 to 30 meters per year silt long, safe harbor task arduous. 1955 年 10 ~ November