John Rowland wrote:
"Richard J." wrote in message
...

To accommodate tides of 7 metres or more, you would
need ramps totalling 90 - 100 metres long (to limit maximum
gradient to the DfT guideline maximum of 1 in 12),
and sufficient of them to cope with large passenger
flows. It's not impossible, but it's a significant constraint
on the design, and may limit potential capacity just
because the piers would take up so much room.

You could have a narrow zigzaggy ramp (or even a lift?) for the
few, and wide steps for the many.

How can you have steps or a lift when the pier is afloat, rising and
falling by up to 7 metres twice a day?
--
Richard J.
(to e-mail me, swap uk and yon in address)