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１９８３年以来，我们在目平湖五一村，对境内封闭型灌渠的支渠采取低涵深层过水，防止钉螺扩散，对主灌渠采取综合措施消灭钉螺。现将观察结果报告如下。１现场概况 五一灌渠与外江互不连通，由机埠抽提内江无螺水灌溉，属境内主灌渠封闭型水系［１］。灌渠全长 ５ ０００ｍ，
Since 1983, in the village of Muyi, Mupingling, we have adopted low-level, deep-water drainage to prevent the spread of snails and implemented comprehensive measures to eliminate snails on the main irrigation channels. The observations are reported below. 1 Site Overview Wuyi Irrigation Channel and the outer river are not connected, the port extraction of non-spiral irrigation Neijiang, which is the main irrigation channel within the closed system [1]. Irrigation channel full length 5 000 m,