[1] 量水標 - Wikipedia (2017-01-14 22:25:51 +09:00) <https://ja.wikipedia.org/wiki/%E9%87%8F%E6%B0%B4%E6%A8%99#.E7.89.B9.E6.AE.8A.E5.9F.BA.E6.BA.96.E9.9D.A2>

[2] 大阪湾最低潮位 - Wikipedia (2017-01-14 22:05:50 +09:00) <https://ja.wikipedia.org/wiki/%E5%A4%A7%E9%98%AA%E6%B9%BE%E6%9C%80%E4%BD%8E%E6%BD%AE%E4%BD%8D>