The high tides change approximately after every 12 hours depending with the season.
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verifiability
A zero period is a high school class offered early in the morning, before the normal start of the school day.
With difficulty unless other dimensions are given.
The next high tide today (13/01/2012) is at 18:13 at Tees-mouth
More information must be given - the width can vary from zero to a really high number. If the volume is given, you can divide it by the product of the length and the height and you get the width.