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长山闸是杭嘉湖平原南排工程三个出海口之一,闸孔总净宽56米,共7孔,每孔宽8米。闸右侧设有2米宽的鱼道,闸内配有接通海宁硖石大运河的河道计69公里,最大排水流量为871米~3/秒。1977年7月开工,1980年5月建成通水。1984年荣获国家优质工程银质奖。长山闸位于海盐县澉浦镇以南2.5公里处的长山南麓,背靠太湖水系,面临杭州湾大海。在南麓建闸排水具有以下优点:一是面临深水线,出水畅通,不会淤积;二是处在难得的风浪小的闸址,节省造价;三是劈山在岩基上建闸,确保安全。工程采用后张自锚予应
Chang Shan Gate Hangjiahu plains south of the project is one of three estuaries, gate total net width of 56 meters, a total of 7 holes, each hole width of 8 meters. There is a 2-meter-wide fishway on the right side of the gate, with 69 kilometers of waterways connected to the Haining Jishi Grand Canal, with a maximum drainage flow of 871 meters-3 / second. Started in July 1977, built in May 1980 through the water. In 1984 won the national quality project silver medal. Changshan Gate is located in the south of Changshan, 2.5 kilometers south of Xupu Town, Haiyan County, facing the Taihu Lake and facing the sea of Hangzhou Bay. In the south foot of the sluice gate has the following advantages: First, the face of deep water line, the water flow, will not silt; Second, in a rare storm small gate site, to save costs; Third, Hill built on the rocky bastion to ensure safety . After the project is self-anchored to post