Originally Posted by Narcosis
This one states the tide time for Albert bridge which is about 2.75m from Putney Bridge via the River and Mortlake is about 3.85m further upstream.
The results are a bit confusing, unless someone can shed light on where I am going wrong with my tide times....please.....
From Admiralty Easytide - Sun 21 Jan @ Albert Bridge
HW LW HW LW
03:25 11:02 15:57 23:08
5.9 m 0.2 m 6.1 m 0.4 m
From Admiralty Easytide - Sun 21 Jan @ Kew Bridge
HW LW HW
03:55 12:31 16:27
5.0 0.0 m 5.2 m
Neil, can't find my Almanac, so not to sure what to say re accuracy of the sites I have been using. Oh and yes I am for an earlier launch( more play time)
By your easytide times (which I also use) and distances, I would trust the times I posted earlier, and not the VRC website times.
Here's my logic:-
Assume that the tide travels at the same speed along the river.
Total distance between Albert Bridge and Kew Bridge = 6.60 miles (approx).
Total time difference between low tide at two bridges is about 90 mins (12:31 vs 11:02)
So for every mile upstream from Albert Bridge, low tide should be 13.64 (90/6.6) minutes later than low tide at albert Bridge.
If Putney is 2.75 miles upstream of Albert Bridge, then it should have low tide about 37.5 minutes later than Albert Bridge, or about 11:40.
The VRC website is the only source I have that does not seem to tie in with the other, either that or I'm doing something stupid (always possible