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江差／桧山（北海道）2057年04月20日の10分毎の潮の高低差を確認できます。
また1日の潮の高低差が1番大きい（潮の流れが大きい）時間に「最大潮位差」と明記してます。

時刻	潮位	高低差	各ポイント
4/20 00:00	2.7	↑0.7
4/20 00:10	3.4	↑0.7
4/20 00:20	4.2	↑0.8
4/20 00:30	5.1	↑0.9
4/20 00:40	5.9	↑0.8
4/20 00:50	6.8	↑0.9
4/20 01:00	7.7	↑0.9
4/20 01:10	8.6	↑0.9
4/20 01:20	9.5	↑0.9
4/20 01:30	10.4	↑0.9
4/20 01:40	11.3	↑0.9
4/20 01:50	12.2	↑0.9
4/20 02:00	13.1	↑0.9
4/20 02:10	14.0	↑0.9
4/20 02:20	14.8	↑0.8
4/20 02:30	15.6	↑0.8
4/20 02:40	16.4	↑0.8
4/20 02:50	17.1	↑0.7
4/20 03:00	17.8	↑0.7
4/20 03:10	18.4	↑0.6
4/20 03:20	19.0	↑0.6
4/20 03:30	19.6	↑0.6
4/20 03:40	20.0	↑0.4
4/20 03:50	20.5	↑0.5
4/20 04:00	20.8	↑0.3
4/20 04:10	21.1	↑0.3
4/20 04:20	21.4	↑0.3
4/20 04:30	21.6	↑0.2
4/20 04:40	21.7	↑0.1
4/20 04:50	21.7	0
4/20 05:00	21.7	0
4/20 05:10	21.7	0
4/20 05:20	21.6	↓-0.1
4/20 05:30	21.4	↓-0.2
4/20 05:40	21.2	↓-0.2
4/20 05:50	20.9	↓-0.3
4/20 06:00	20.6	↓-0.3
4/20 06:10	20.2	↓-0.4
4/20 06:20	19.8	↓-0.4
4/20 06:30	19.4	↓-0.4
4/20 06:40	18.9	↓-0.5
4/20 06:50	18.4	↓-0.5
4/20 07:00	17.9	↓-0.5
4/20 07:10	17.4	↓-0.5
4/20 07:20	16.9	↓-0.5
4/20 07:30	16.3	↓-0.6
4/20 07:40	15.8	↓-0.5
4/20 07:50	15.3	↓-0.5
4/20 08:00	14.7	↓-0.6
4/20 08:10	14.2	↓-0.5
4/20 08:20	13.7	↓-0.5
4/20 08:30	13.2	↓-0.5
4/20 08:40	12.8	↓-0.4
4/20 08:50	12.3	↓-0.5
4/20 09:00	11.9	↓-0.4
4/20 09:10	11.6	↓-0.3
4/20 09:20	11.3	↓-0.3
4/20 09:30	11.0	↓-0.3
4/20 09:40	10.8	↓-0.2
4/20 09:50	10.6	↓-0.2
4/20 10:00	10.5	↓-0.1
4/20 10:10	10.4	↓-0.1
4/20 10:20	10.3	↓-0.1
4/20 10:30	10.4	↑0.1
4/20 10:40	10.4	0
4/20 10:50	10.5	↑0.1
4/20 11:00	10.7	↑0.2
4/20 11:10	10.9	↑0.2
4/20 11:20	11.2	↑0.3
4/20 11:30	11.5	↑0.3
4/20 11:40	11.8	↑0.3
4/20 11:50	12.2	↑0.4
4/20 12:00	12.6	↑0.4
4/20 12:10	13.0	↑0.4
4/20 12:20	13.5	↑0.5
4/20 12:30	14.0	↑0.5
4/20 12:40	14.5	↑0.5
4/20 12:50	15.0	↑0.5
4/20 13:00	15.6	↑0.6
4/20 13:10	16.1	↑0.5
4/20 13:20	16.7	↑0.6
4/20 13:30	17.2	↑0.5
4/20 13:40	17.7	↑0.5
4/20 13:50	18.2	↑0.5
4/20 14:00	18.7	↑0.5
4/20 14:10	19.2	↑0.5
4/20 14:20	19.6	↑0.4
4/20 14:30	20.0	↑0.4
4/20 14:40	20.4	↑0.4
4/20 14:50	20.7	↑0.3
4/20 15:00	20.9	↑0.2
4/20 15:10	21.2	↑0.3
4/20 15:20	21.3	↑0.1
4/20 15:30	21.5	↑0.2
4/20 15:40	21.5	0
4/20 15:50	21.5	0
4/20 16:00	21.4	↓-0.1
4/20 16:10	21.3	↓-0.1
4/20 16:20	21.1	↓-0.2
4/20 16:30	20.9	↓-0.2
4/20 16:40	20.6	↓-0.3
4/20 16:50	20.2	↓-0.4
4/20 17:00	19.7	↓-0.5
4/20 17:10	19.2	↓-0.5
4/20 17:20	18.7	↓-0.5
4/20 17:30	18.1	↓-0.6
4/20 17:40	17.4	↓-0.7
4/20 17:50	16.7	↓-0.7
4/20 18:00	15.9	↓-0.8
4/20 18:10	15.1	↓-0.8
4/20 18:20	14.3	↓-0.8
4/20 18:30	13.4	↓-0.9
4/20 18:40	12.5	↓-0.9
4/20 18:50	11.6	↓-0.9
4/20 19:00	10.6	↓-1.0	最大潮位差
4/20 19:10	9.7	↓-0.9
4/20 19:20	8.7	↓-1.0	最大潮位差
4/20 19:30	7.7	↓-1.0	最大潮位差
4/20 19:40	6.7	↓-1.0	最大潮位差
4/20 19:50	5.8	↓-0.9
4/20 20:00	4.8	↓-1.0	最大潮位差
4/20 20:10	3.9	↓-0.9
4/20 20:20	3.0	↓-0.9
4/20 20:30	2.2	↓-0.8
4/20 20:40	1.3	↓-0.9
4/20 20:50	0.5	↓-0.8
4/20 21:00	-0.2	↓-0.7
4/20 21:10	-0.9	↓-0.7
4/20 21:20	-1.5	↓-0.6
4/20 21:30	-2.1	↓-0.6
4/20 21:40	-2.7	↓-0.6
4/20 21:50	-3.1	↓-0.4
4/20 22:00	-3.5	↓-0.4
4/20 22:10	-3.8	↓-0.3
4/20 22:20	-4.1	↓-0.3
4/20 22:30	-4.2	↓-0.1
4/20 22:40	-4.4	↓-0.2
4/20 22:50	-4.4	0
4/20 23:00	-4.3	↑0.1
4/20 23:10	-4.2	↑0.1
4/20 23:20	-4.0	↑0.2
4/20 23:30	-3.8	↑0.2
4/20 23:40	-3.5	↑0.3
4/20 23:50	-3.1	↑0.4