Weekly quiz: wet dock sill tide calculation

The English Channel port of Perros-Guirec (Brittany, NW France) just inaugurated the new gate-flap of its wet dock.

Let’s suppose you’re planning to go there for the July 14th fireworks. But will you make it in time?

Question of the day

🔹 Using the (manual) method of your choice, explain your calculation of the evening opening time, given a sill elevation at 7.5 meters above chart datum.

Here is the tide prediction :

And bonus questions

🔹 What time will the sill close at thereafter?
🔹 The timetables published by the harbor office most certainly differ slightly from those your calculated. For what reasons ?

👉 Reply on one of our social media below. We’ll post the solution right here next Sunday!

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