Nav wrote:


DSK wrote:

"Peter S/Y Anicula" wrote...

If you only know the time of HW and LW, you can assume that the


curve

of the tidal current will look a bit like a sinus curve.



Yes, that's true. The current will also follow the 'rule of 12s'
somewhat, lagging because of the momentum of the water in motion.

In the absence of current tables, assume the max current is at 7/12s
the interval between high & low water.


Got that wrong Doug. Tidal stream is generally strongest at the time of
the fastest rate of change of tide height. That is most often about
halfway between high and low water. Look it up.

Cheers

Personally, I disagree. You need to know where you are (narrow
opening/wide opening) and various given conditions before you start to
apply any particular rule. Compare your tables (tide/current) for the
particular locale, then see if a particular rule applies at all times or
only sometimes.

otn