20 (火)	04:38	10:19	15:39	22:34
	23cm	10cm	21cm	-3cm
大潮 出 04:53 入 18:26 出 19:25 入 05:33

江差／桧山（北海道）2038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	4.7	↑0.7
4/20 00:10	5.5	↑0.8
4/20 00:20	6.4	↑0.9
4/20 00:30	7.2	↑0.8
4/20 00:40	8.1	↑0.9
4/20 00:50	9.0	↑0.9
4/20 01:00	9.9	↑0.9
4/20 01:10	10.8	↑0.9
4/20 01:20	11.7	↑0.9
4/20 01:30	12.6	↑0.9
4/20 01:40	13.5	↑0.9
4/20 01:50	14.3	↑0.8
4/20 02:00	15.2	↑0.9
4/20 02:10	16.0	↑0.8
4/20 02:20	16.7	↑0.7
4/20 02:30	17.5	↑0.8
4/20 02:40	18.2	↑0.7
4/20 02:50	18.8	↑0.6
4/20 03:00	19.4	↑0.6
4/20 03:10	20.0	↑0.6
4/20 03:20	20.5	↑0.5
4/20 03:30	20.9	↑0.4
4/20 03:40	21.3	↑0.4
4/20 03:50	21.6	↑0.3
4/20 04:00	21.9	↑0.3
4/20 04:10	22.1	↑0.2
4/20 04:20	22.2	↑0.1
4/20 04:30	22.3	↑0.1	満潮
4/20 04:40	22.3	0
4/20 04:50	22.3	0
4/20 05:00	22.1	↓-0.2
4/20 05:10	22.0	↓-0.1
4/20 05:20	21.8	↓-0.2
4/20 05:30	21.5	↓-0.3
4/20 05:40	21.2	↓-0.3
4/20 05:50	20.8	↓-0.4
4/20 06:00	20.4	↓-0.4
4/20 06:10	19.9	↓-0.5
4/20 06:20	19.5	↓-0.4
4/20 06:30	19.0	↓-0.5
4/20 06:40	18.4	↓-0.6
4/20 06:50	17.9	↓-0.5
4/20 07:00	17.3	↓-0.6
4/20 07:10	16.7	↓-0.6
4/20 07:20	16.1	↓-0.6
4/20 07:30	15.5	↓-0.6
4/20 07:40	14.9	↓-0.6
4/20 07:50	14.4	↓-0.5
4/20 08:00	13.8	↓-0.6
4/20 08:10	13.2	↓-0.6
4/20 08:20	12.7	↓-0.5
4/20 08:30	12.2	↓-0.5
4/20 08:40	11.8	↓-0.4
4/20 08:50	11.3	↓-0.5
4/20 09:00	10.9	↓-0.4
4/20 09:10	10.6	↓-0.3
4/20 09:20	10.3	↓-0.3
4/20 09:30	10.0	↓-0.3
4/20 09:40	9.8	↓-0.2
4/20 09:50	9.6	↓-0.2
4/20 10:00	9.5	↓-0.1
4/20 10:10	9.4	↓-0.1	干潮
4/20 10:20	9.4	0
4/20 10:30	9.4	0
4/20 10:40	9.5	↑0.1
4/20 10:50	9.7	↑0.2
4/20 11:00	9.9	↑0.2
4/20 11:10	10.1	↑0.2
4/20 11:20	10.4	↑0.3
4/20 11:30	10.7	↑0.3
4/20 11:40	11.0	↑0.3
4/20 11:50	11.4	↑0.4
4/20 12:00	11.9	↑0.5
4/20 12:10	12.3	↑0.4
4/20 12:20	12.8	↑0.5
4/20 12:30	13.3	↑0.5
4/20 12:40	13.8	↑0.5
4/20 12:50	14.3	↑0.5
4/20 13:00	14.9	↑0.6
4/20 13:10	15.4	↑0.5
4/20 13:20	15.9	↑0.5
4/20 13:30	16.4	↑0.5
4/20 13:40	16.9	↑0.5
4/20 13:50	17.4	↑0.5
4/20 14:00	17.9	↑0.5
4/20 14:10	18.3	↑0.4
4/20 14:20	18.7	↑0.4
4/20 14:30	19.1	↑0.4
4/20 14:40	19.4	↑0.3
4/20 14:50	19.7	↑0.3
4/20 15:00	20.0	↑0.3
4/20 15:10	20.1	↑0.1
4/20 15:20	20.3	↑0.2
4/20 15:30	20.3	0	満潮
4/20 15:40	20.4	↑0.1
4/20 15:50	20.3	↓-0.1
4/20 16:00	20.2	↓-0.1
4/20 16:10	20.1	↓-0.1
4/20 16:20	19.8	↓-0.3
4/20 16:30	19.6	↓-0.2
4/20 16:40	19.2	↓-0.4
4/20 16:50	18.8	↓-0.4
4/20 17:00	18.3	↓-0.5
4/20 17:10	17.8	↓-0.5
4/20 17:20	17.2	↓-0.6
4/20 17:30	16.6	↓-0.6
4/20 17:40	15.9	↓-0.7
4/20 17:50	15.2	↓-0.7
4/20 18:00	14.4	↓-0.8
4/20 18:10	13.7	↓-0.7
4/20 18:20	12.8	↓-0.9
4/20 18:30	12.0	↓-0.8
4/20 18:40	11.1	↓-0.9
4/20 18:50	10.2	↓-0.9
4/20 19:00	9.3	↓-0.9
4/20 19:10	8.3	↓-1.0	最大潮位差
4/20 19:20	7.4	↓-0.9
4/20 19:30	6.5	↓-0.9
4/20 19:40	5.6	↓-0.9
4/20 19:50	4.7	↓-0.9
4/20 20:00	3.8	↓-0.9
4/20 20:10	3.0	↓-0.8
4/20 20:20	2.2	↓-0.8
4/20 20:30	1.4	↓-0.8
4/20 20:40	0.7	↓-0.7
4/20 20:50	0.0	↓-0.7
4/20 21:00	-0.7	0
4/20 21:10	-1.3	↓-0.6
4/20 21:20	-1.8	↓-0.5
4/20 21:30	-2.2	↓-0.4
4/20 21:40	-2.7	↓-0.5
4/20 21:50	-3.0	↓-0.3
4/20 22:00	-3.3	↓-0.3
4/20 22:10	-3.5	↓-0.2
4/20 22:20	-3.6	↓-0.1
4/20 22:30	-3.7	↓-0.1	干潮
4/20 22:40	-3.6	↑0.1
4/20 22:50	-3.5	↑0.1
4/20 23:00	-3.4	↑0.1
4/20 23:10	-3.2	↑0.2
4/20 23:20	-2.9	↑0.3
4/20 23:30	-2.5	↑0.4
4/20 23:40	-2.1	↑0.4
4/20 23:50	-1.6	↑0.5