9 Year Cycle

 

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The 9 Year Bore Cycle

Whether large bores occur after new moons or full moons varies due to the fact that there is a nine-year cycle. The cycle runs as follows:

  • highest tides occur following a new moon
  • the highest tides at new and full moons are approximately equal
  • highest tides occur following a full moon
  • the highest tides at new and full moons are approximately equal

The cycle then starts again. The cycle is shown in the following diagram:

 


 

 

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©Russell Higgins 2007
russell@severn-bore.co.uk

Some of this information on this site (including the B+W images) is sourced from the book "The Severn Bore" by Fred Rowbotham, who was District Engineer of the Severn River Board.
The times for the Severn Bore are calculated from Arrowsmith's Severn Tide Tables. No liability will be held for any inaccuracy in the times displayed.