mark99 Posted July 6, 2018 Report Share Posted July 6, 2018 Nice video. Perhaps my favourite bit of the River. Made special as you can't moor there realistically and only see it went travelling down to the GU (at siilly speeds if you time it) or up to Teddington. https://www.youtube.com/watch?v=L8AjTxLlTVw Link to comment Share on other sites More sharing options...
OldGoat Posted July 6, 2018 Report Share Posted July 6, 2018 Oooo - the drought's hit early has it? (yes, I know....) Link to comment Share on other sites More sharing options...
WJM Posted July 9, 2018 Report Share Posted July 9, 2018 It is not just low tide - it is the river during the annual Draw Off. Each November the river is deliberately drained for around two weeks by holding Richmond Weir open and allowing the full range of the tide. Richmond is normally only half-tidal. Link to comment Share on other sites More sharing options...
Scholar Gypsy Posted July 9, 2018 Report Share Posted July 9, 2018 Here are the 2018 dates: http://pla.co.uk/assets/u12of2018-richmondlockweirdrawoff2018.pdf 28 October to 18 November. 7-11th look like the biggest tides. It's a fun walk from Teddington (where you can see the bottom of the skiff lock) to Richmond. Here are some photos from last November.https://nbsg.wordpress.com/2017/11/18/what-happens-if-you-leave-the-paddles-open/ Link to comment Share on other sites More sharing options...
ditchcrawler Posted July 9, 2018 Report Share Posted July 9, 2018 9 minutes ago, Scholar Gypsy said: Here are the 2018 dates: http://pla.co.uk/assets/u12of2018-richmondlockweirdrawoff2018.pdf 28 October to 18 November. 7-11th look like the biggest tides. It's a fun walk from Teddington (where you can see the bottom of the skiff lock) to Richmond. Here are some photos from last November.https://nbsg.wordpress.com/2017/11/18/what-happens-if-you-leave-the-paddles-open/ What happens at high tide, does it overtop Tedington? Link to comment Share on other sites More sharing options...
Scholar Gypsy Posted July 10, 2018 Report Share Posted July 10, 2018 7 hours ago, ditchcrawler said: What happens at high tide, does it overtop Tedington? Yes, at high spring tides (and in particular if there is a lot of fresh water coming down the river) the water can overtop the weir at Teddington, although I think not as often as happens at Brentford. It's rather weird, when the noise of the weir suddenly stops. The effect can be felt as far as Hampton Court, ie Molesey Lock. I suspect it may happen rather less often than it used to, as the Thames Barrier can now be shut to reduce the risk of flooding in the Chiswick and Richmond area. As far as I can work out, the weir (and chart datum) at Richmond is 1.7m AOD, the weir at Teddington is about 4.3m AOD, so 2.6m higher, and Highest Astronomical Tide at Twickenham is 3.2m above the datum (ie 4.9m AOD). MHWS is 2.5m above (so 4.2m AOD). http://www.gaugemap.co.uk/#!Detail/7520/2811/2018-07-04/2018-07-10 which I think is above Teddington is a bit confusing. It's not what I would expect (which would be a constant reading with a blip upwards for say an hour either side of HW). This one (below the lock I think) shows the effect of Richmond weir. http://www.gaugemap.co.uk/#!Map/Summary/1250/1383/2018-07-04/2018-07-10 but the numbers are odd, it shows the retained water level at 3.2m. More research needed! Link to comment Share on other sites More sharing options...
mark99 Posted July 10, 2018 Author Report Share Posted July 10, 2018 Before locks the tidal effect used to reach Staines. Hence the London Stone @ Staines. Link to comment Share on other sites More sharing options...
ditchcrawler Posted July 10, 2018 Report Share Posted July 10, 2018 9 hours ago, Scholar Gypsy said: Yes, at high spring tides (and in particular if there is a lot of fresh water coming down the river) the water can overtop the weir at Teddington, although I think not as often as happens at Brentford. It's rather weird, when the noise of the weir suddenly stops. The effect can be felt as far as Hampton Court, ie Molesey Lock. I suspect it may happen rather less often than it used to, as the Thames Barrier can now be shut to reduce the risk of flooding in the Chiswick and Richmond area. As far as I can work out, the weir (and chart datum) at Richmond is 1.7m AOD, the weir at Teddington is about 4.3m AOD, so 2.6m higher, and Highest Astronomical Tide at Twickenham is 3.2m above the datum (ie 4.9m AOD). MHWS is 2.5m above (so 4.2m AOD). http://www.gaugemap.co.uk/#!Detail/7520/2811/2018-07-04/2018-07-10 which I think is above Teddington is a bit confusing. It's not what I would expect (which would be a constant reading with a blip upwards for say an hour either side of HW). This one (below the lock I think) shows the effect of Richmond weir. http://www.gaugemap.co.uk/#!Map/Summary/1250/1383/2018-07-04/2018-07-10 but the numbers are odd, it shows the retained water level at 3.2m. More research needed! I realised it was a silly question some time after I posted it, because the Richmond barrier is always open at high tide so having it open for a long period would make no difference to the high water level. I have seen Teddington weir on the level a couple of times when I have been there, I use to stay near by sometimes Link to comment Share on other sites More sharing options...
Scholar Gypsy Posted July 10, 2018 Report Share Posted July 10, 2018 3 minutes ago, ditchcrawler said: I realised it was a silly question some time after I posted it, because the Richmond barrier is always open at high tide so having it open for a long period would make no difference to the high water level. I have seen Teddington weir on the level a couple of times when I have been there, I use to stay near by sometimes I don't think it's a silly question. . It would be quite possible, I think, for spring tides to overtop Teddington when Richmond weir is in use, and not when it isn't - because in the latter case a lot more water has to flow upstream. It's an empirical question. Tides do some very strange things (for example on some parts of the Trent LW Springs are higher than LW Neaps.) Link to comment Share on other sites More sharing options...
BWM Posted July 10, 2018 Report Share Posted July 10, 2018 https://www.facebook.com/putneyhightideclub/ Some high tides and their consequences in nearby Putney. 1 Link to comment Share on other sites More sharing options...
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