RYA Yachtmaster

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Sea levels are currently rising at 3mm pa so assuming my NP218 is 30 years old then that is 9cm, not a trifling amount when magnified over such a huge area.

Also read many years ago that the 'engine' that drives the tidal flow off the west coast were the twin estuaries of the Mersey & the Dee. Sounds unlikely and I cannot remember the source but I do remember that I thought it credible at the time. The Dee in particular has silted up a lot over the last hunderd years (you can still see the now dried out quay at Parkgate).

It would be interesting to find out when the models for NP218 were calculated.

Apols again for o/t - at least it gives me the chance to wish Geoff good luck again !

[Alan_D]

back off topic

Sea levels are currently rising at 3mm pa so assuming my NP218 is 30 years old then that is 9cm, not a trifling amount when magnified over such a huge area.

Also read many years ago that the 'engine' that drives the tidal flow off the west coast were the twin estuaries of the Mersey & the Dee. Sounds unlikely and I cannot remember the source but I do remember that I thought it credible at the time. The Dee in particular has silted up a lot over the last hunderd years (you can still see the now dried out quay at Parkgate).

It would be interesting to find out when the models for NP218 were calculated.

Apols again for o/t - at least it gives me the chance to wish Geoff good luck again !

You can compare predicted against actual heights at: http://www.ntslf.org/data/uk-network-real-time. This is height, not rate, but the two are closely related, and I think if systematic differences were occurring it would have been spotted by now.