Tides - Useful downloads & teaching aids
Our restless tides
Tide & Current Glossary
Tides Quiz Ball
Calculating tidal height at secondary ports
Rule of 12th explained
Tide Tutorials
Reading & Interpreting a Tide Table:
Interpreting Tidal Diamonds on a nautical chart:
Tidal curves:
Tides
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The Rule of 12ths is a rule that helps us estimate the height of tide at any given time with only the time and height of high water and low water as information.
The rule states that in the first hour after low tide, the water level will rise by 1/12th of the range, in the second hour 2/12th's and so on, as shown in the image.
Why are tides called Springs and Neaps?
The Shorter Oxford dictionary gives the derivation of 'neap' from the Old English (OE) word 'nep', to become lower. Thus the OE 'nepflod' tide gives as a rough translation 'low flood' tide
Reference: www.swmaritime.org.uk
Tides
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