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[[File:设计最低通航水 位位7.jpg|350px|缩略图|右|<big> 设计 洪泽湖逼近 最低通航水位</big>[http://slidesplayerpic.people.com.cn/11484543NMediaFile/622014/images0716/18/3%E3%80%81%E5%A4%A9%E7%84%B6%E6%B2%B3%E6%B5%81%E6%9C%80%E4%BD%8E%E9%80%9A%E8%88%AA%E6%B0%B4%E4%BD%8D+%EF%BC%881%EF%BC%89%E9%87%87%E7%94%A8%E4%BF%9D%E8%AF%81%E7%8E%87%E9%A2%91%E7%8E%87%E6%B3%95%EF%BC%881%EF%BC%8D4%E7%BA%A7%E8%88%AA%E9%81%93%EF%BC%89+%EF%BC%882%EF%BC%89%E7%BB%BC%E5%90%88%E5%8E%86%E6%97%B6%E6%9B%B2%E7%BA%BF%E6%B3%95%EF%BC%885%EF%BC%8D7%E7%BA%A7%EF%BC%89MAIN201407160957000465905726070.jpg 原图链接][httpshttp://cnheze.bingdzwww.com/imagesshxw/search?view=detailV2&id=4B22E72AC3D159FEB21ADD4A514F863BC6095FFC&thid=OIP.PN8qQJwbyx_AwyIqG8NvHwHaFj&mediaurl=http%3A%2F%2Fslidesplayer.com%2F11484543%2F62%2Fimages%2F18%2F3%25E3%2580%2581%25E5%25A4%25A9%25E7%2584%25B6%25E6%25B2%25B3%25E6%25B5%2581%25E6%259C%2580%25E4%25BD%258E%25E9%2580%259A%25E8%2588%25AA%25E6%25B0%25B4%25E4%25BD%258D%2B%25EF%25BC%25881%25EF%25BC%2589%25E9%2587%2587%25E7%2594%25A8%25E4%25BF%259D%25E8%25AF%2581%25E7%258E%2587%25E9%25A2%2591%25E7%258E%2587%25E6%25B3%2595%25EF%25BC%25881%25EF%25BC%258D4%25E7%25BA%25A7%25E8%2588%25AA%25E9%2581%2593%25EF%25BC%2589%2B%25EF%25BC%25882%25EF%25BC%2589%25E7%25BB%25BC%25E5%2590%2588%25E5%258E%2586%25E6%2597%25B6%25E6%259B%25B2%25E7%25BA%25BF%25E6%25B3%2595%25EF%25BC%25885%25EF%25BC%258D7%25E7%25BA%25A7%25EF%25BC%2589201407/t20140717_10666333.jpg&exph=768&expw=1024&q=%e8%ae%be%e8%ae%a1%e6%9c%80%e4%bd%8e%e9%80%9a%e8%88%aa%e6%b0%b4%e4%bd%8d&selectedindex=11&ajaxhist=0&vt=0 htm 来自 必应 新华社 的图片]]]
设计最低通航水位(minimum navigable stage of channel)是指标准载重船舶在某一航道上能正常通航的最低水位。是确定航道水深，船闸闸首门槛和闸室底高程的起算水位。在工程实践中，它通常等于按规定的通航保证率从综合历时曲线所选取的相应水位。综合历时保证曲线根据多年水文资料统计的日平均水位进行分级计算得到。通航保证率则根据航道等级和航道的自然条件等选定，1-2级航道一般取为大于等于98%。