Drawdown 2016

[teddington_lock]

You could lower the reaches a bit but nothing like the drawdown, the weirs are just overflows so a minimum amount is always there like the overflow in your bath. To expose the riverbed you need a plughole in the bottom which is what Richmond barrier is when the tide is out.
I suppose opening both end sluices on a lock might get rid of enough but it would take a long time.

I'm not sure I'd agree with this. Just using Teddington as an example , the fall on the weir is the same as the lock , 8'10"

If you opened Teddington weir you'd drop the level in the reach above by 8'10" which, if there was no water being fed from Molesey , would empty the reach ( which has an average depth of 6/7 feet ) fairly quickly.

The weirs aren't just 'overflows' ... The gates extend to the river bed, exactly the same as Richmond. Same goes for all the other weirs upstream.

 

[boatone]

So what happened in the Datchet stretch around 0800 yesterday morning - river dropped by at least 2 feet leaving all Kris Cruisers boats on the mud.

 

[TrueBlue]

So what happened in the Datchet stretch around 0800 yesterday morning - river dropped by at least 2 feet leaving all Kris Cruisers boats on the mud.

Could be an indicator of what might happen if the "We can manage the weirs with a man in a while van" brigade ever happened.....

 

[teddington_lock]

So what happened in the Datchet stretch around 0800 yesterday morning - river dropped by at least 2 feet leaving all Kris Cruisers boats on the mud.

You could ask the lock keeper at Old Windsor ?

There's only one way a reach can drop like that , and that's with a weir.

 

[Time Out]

You could ask the lock keeper at Old Windsor ?

There's only one way a reach can drop like that , and that's with a weir.

Too simple, what about an unknown sink hole?

 

[teddington_lock]

Plausible

 

[SnowCat]

Testing out the Jubilee River before the winter sets in?

 

[apollo]

ooooh you are getting warm!

 

[Lower Limit 1909]

Practice run for the next time a Trotman barge appears on this reach?