If the height of the tide at low water is 0.0 feet, the range is 9.0 feet, and the duration is 06h 00m. What is the height of the tide 02h 12m before high water?

Correct Answer: Option B — 6.3 feet

Using the standard 30-minute rule for tide curves from Bowditch, a duration of 6 hours and range of 9 feet yields height increments of 0.8, 2.7, 6.3, 8.3, and 9.0 feet. At 02h 12m (roughly 2 hours) before high water, the height is 6.3 feet.