Alan ashore
Well-Known Member
Reposted with correct height scale <cough>. Nobody noticed. Ah well...
Tidal heights at Teddington
- Thread starter Alan ashore
- Start date
oldgit
Well-Known Member
Egret
Well-Known Member
Lots of data points, big spread on high tides - can you show chart datums, flooding levels and write a summary of your conclusions - interesting
Last edited:
Alan ashore
Well-Known Member
I'll post some more pretty pictures shortly, but the purpose of this was to explore the relationship between fluvial flow and the draw-off low tide - the green dots which are fairly tight.
It's hardly an earth shattering conclusion but a key take away is that if the flow is around 100 cumecs or more, then the level doesn't fall below the otherwise maintained level.
My particular interest is that my mooring dries completely during draw-off when flow is low, and my boat would not enjoy drying out.
One year when flows had been high all autumn I risked leaving her here, albeit rafted one out, and the weather suddenly turned dry upriver. For a week or so it was all a bit dicey, with some interesting ropework to keep her upright. Since then I usually move her above the lock. This year I couldn't do that and Howard has kindly accomodated me on his moorings.
Yes I'll add them to the picture, but CD is 1.72m AOD (also the maintained level). The official flood defence level is 5.94m AOD, but a lot of local properties would experience significant trauma well below that.
The large high tide spread is of course mostly normal Neap to Spring variation.
It's hardly an earth shattering conclusion but a key take away is that if the flow is around 100 cumecs or more, then the level doesn't fall below the otherwise maintained level.
My particular interest is that my mooring dries completely during draw-off when flow is low, and my boat would not enjoy drying out.
One year when flows had been high all autumn I risked leaving her here, albeit rafted one out, and the weather suddenly turned dry upriver. For a week or so it was all a bit dicey, with some interesting ropework to keep her upright. Since then I usually move her above the lock. This year I couldn't do that and Howard has kindly accomodated me on his moorings.
Yes I'll add them to the picture, but CD is 1.72m AOD (also the maintained level). The official flood defence level is 5.94m AOD, but a lot of local properties would experience significant trauma well below that.
The large high tide spread is of course mostly normal Neap to Spring variation.
Time Out
Well-Known Member
I’m also at Tedd Harbour ( below bridge inside) and even with draw off I have about 4 ft below the keel !