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日立（茨城）2030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	67.8	↑1.9
4/20 00:10	69.9	↑2.1
4/20 00:20	72.3	↑2.4
4/20 00:30	74.9	↑2.6
4/20 00:40	77.7	↑2.8
4/20 00:50	80.7	↑3.0
4/20 01:00	83.8	↑3.1
4/20 01:10	87.2	↑3.4
4/20 01:20	90.6	↑3.4
4/20 01:30	94.1	↑3.5
4/20 01:40	97.6	↑3.5
4/20 01:50	101.1	↑3.5
4/20 02:00	104.7	↑3.6
4/20 02:10	108.1	↑3.4
4/20 02:20	111.5	↑3.4
4/20 02:30	114.7	↑3.2
4/20 02:40	117.7	↑3.0
4/20 02:50	120.6	↑2.9
4/20 03:00	123.3	↑2.7
4/20 03:10	125.7	↑2.4
4/20 03:20	127.8	↑2.1
4/20 03:30	129.7	↑1.9
4/20 03:40	131.2	↑1.5
4/20 03:50	132.4	↑1.2
4/20 04:00	133.3	↑0.9
4/20 04:10	133.9	↑0.6
4/20 04:20	134.1	↑0.2
4/20 04:30	134.0	↓-0.1
4/20 04:40	133.5	↓-0.5
4/20 04:50	132.6	↓-0.9
4/20 05:00	131.4	↓-1.2
4/20 05:10	129.8	↓-1.6
4/20 05:20	127.9	↓-1.9
4/20 05:30	125.6	↓-2.3
4/20 05:40	123.0	↓-2.6
4/20 05:50	120.0	↓-3.0
4/20 06:00	116.7	↓-3.3
4/20 06:10	113.1	↓-3.6
4/20 06:20	109.1	↓-4.0
4/20 06:30	104.9	↓-4.2
4/20 06:40	100.4	↓-4.5
4/20 06:50	95.7	↓-4.7
4/20 07:00	90.8	↓-4.9
4/20 07:10	85.6	↓-5.2
4/20 07:20	80.4	↓-5.2
4/20 07:30	74.9	↓-5.5
4/20 07:40	69.4	↓-5.5
4/20 07:50	63.9	↓-5.5
4/20 08:00	58.3	↓-5.6	最大潮位差
4/20 08:10	52.7	↓-5.6	最大潮位差
4/20 08:20	47.2	↓-5.5
4/20 08:30	41.8	↓-5.4
4/20 08:40	36.5	↓-5.3
4/20 08:50	31.4	↓-5.1
4/20 09:00	26.4	↓-5.0
4/20 09:10	21.7	↓-4.7
4/20 09:20	17.2	↓-4.5
4/20 09:30	13.0	↓-4.2
4/20 09:40	9.1	↓-3.9
4/20 09:50	5.4	↓-3.7
4/20 10:00	2.1	↓-3.3
4/20 10:10	-0.8	↓-2.9
4/20 10:20	-3.4	↓-2.6
4/20 10:30	-5.7	↓-2.3
4/20 10:40	-7.5	↓-1.8
4/20 10:50	-9.0	↓-1.5
4/20 11:00	-10.1	↓-1.1
4/20 11:10	-10.9	↓-0.8
4/20 11:20	-11.2	↓-0.3
4/20 11:30	-11.1	↑0.1
4/20 11:40	-10.7	↑0.4
4/20 11:50	-9.8	↑0.9
4/20 12:00	-8.6	↑1.2
4/20 12:10	-7.0	↑1.6
4/20 12:20	-4.9	↑2.1
4/20 12:30	-2.6	↑2.3
4/20 12:40	0.2	↑2.8
4/20 12:50	3.2	↑3.0
4/20 13:00	6.6	↑3.4
4/20 13:10	10.3	↑3.7
4/20 13:20	14.3	↑4.0
4/20 13:30	18.5	↑4.2
4/20 13:40	22.9	↑4.4
4/20 13:50	27.5	↑4.6
4/20 14:00	32.3	↑4.8
4/20 14:10	37.2	↑4.9
4/20 14:20	42.2	↑5.0
4/20 14:30	47.2	↑5.0
4/20 14:40	52.3	↑5.1
4/20 14:50	57.4	↑5.1
4/20 15:00	62.4	↑5.0
4/20 15:10	67.3	↑4.9
4/20 15:20	72.1	↑4.8
4/20 15:30	76.8	↑4.7
4/20 15:40	81.3	↑4.5
4/20 15:50	85.7	↑4.4
4/20 16:00	89.8	↑4.1
4/20 16:10	93.8	↑4.0
4/20 16:20	97.5	↑3.7
4/20 16:30	101.0	↑3.5
4/20 16:40	104.1	↑3.1
4/20 16:50	107.1	↑3.0
4/20 17:00	109.7	↑2.6
4/20 17:10	112.1	↑2.4
4/20 17:20	114.1	↑2.0
4/20 17:30	115.9	↑1.8
4/20 17:40	117.3	↑1.4
4/20 17:50	118.4	↑1.1
4/20 18:00	119.2	↑0.8
4/20 18:10	119.7	↑0.5
4/20 18:20	119.9	↑0.2
4/20 18:30	119.7	↓-0.2
4/20 18:40	119.3	↓-0.4
4/20 18:50	118.5	↓-0.8
4/20 19:00	117.5	↓-1.0
4/20 19:10	116.2	↓-1.3
4/20 19:20	114.7	↓-1.5
4/20 19:30	112.9	↓-1.8
4/20 19:40	110.9	↓-2.0
4/20 19:50	108.7	↓-2.2
4/20 20:00	106.3	↓-2.4
4/20 20:10	103.9	↓-2.4
4/20 20:20	101.3	↓-2.6
4/20 20:30	98.7	↓-2.6
4/20 20:40	96.0	↓-2.7
4/20 20:50	93.3	↓-2.7
4/20 21:00	90.6	↓-2.7
4/20 21:10	88.0	↓-2.6
4/20 21:20	85.4	↓-2.6
4/20 21:30	83.0	↓-2.4
4/20 21:40	80.7	↓-2.3
4/20 21:50	78.5	↓-2.2
4/20 22:00	76.5	↓-2.0
4/20 22:10	74.6	↓-1.9
4/20 22:20	73.0	↓-1.6
4/20 22:30	71.5	↓-1.5
4/20 22:40	70.3	↓-1.2
4/20 22:50	69.3	↓-1.0
4/20 23:00	68.6	↓-0.7
4/20 23:10	68.1	↓-0.5
4/20 23:20	67.8	↓-0.3
4/20 23:30	67.9	↑0.1
4/20 23:40	68.1	↑0.2
4/20 23:50	68.7	↑0.6