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Richmond (Thames)


mark99

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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.

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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/

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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?

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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!

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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

 

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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.)

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