please empty your brain below
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And, south of the river?
Ken | 02.04.19 - 7:04 a.m. | #
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Fascinating.
Bough Beech is my local. Hadn't appreciated that the two big uns in the Lea Valley were bigger.
a | 02.04.19 - 7:27 a.m. | #
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Yes, but what's the largest lake in the City?
Anonymous | 02.04.19 - 7:44 a.m. | #
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There is a reservoir in Stanwell that has a little used footpath across it.
John | 02.04.19 - 7:55 a.m. | #
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Fascinating. I didn't know of those ones along the Colne Valley at all.
My first thought was "the Welsh Harp". But of course some of the Lea Valley ones are larger.
As for why mostly North of the river? It's flatter and there are more substantial river flows there, I think would be among the main reasons.
Dominic H | 02.04.19 - 8:43 a.m. | #
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3. Welsh Harp - I thought the name related to the shape of the lake, not a pub - was the pub perhaps named after the lake (like our famous queen named after a railway station ;-) ).
Pub quiz question - why is the Barnet / Brent boundary so wiggly across the Reservoir? The answer is in the fourth sentence of DG’s description!
Stephen | 02.04.19 - 9:27 a.m. | #
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Which came first, the Welsh Harp pub or the Welsh Harp shape, is a controversy discussed at fascinating length here.
Answer, it seems... the shape is coincidental, and the name follows the pub.
diamond geezer | Homepage | 02.04.19 - 9:36 a.m. | #
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Interesting that all the largest are artificial; its a long way down the list before anything natural turns up.
Geo_rich | 02.04.19 - 9:45 a.m. | #
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Classic DG!
Fascinating stuff.
MikeK | 02.04.19 - 10:33 a.m. | #
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South of the river, inside the M25, there are the QEII and Island Barn reservoirs, 122 and 48 hectares, but they are both in Surrey.
South of the river, in London, there are the Ruxley Lakes in Foots Cray (four gravel pits in Bexley: 10 hectares), London Wetland Centre (Barnes: the portal says there are three lakes of 9, 8, and 8 hectares, but perhaps it could be considered one larger interconnected lake) and Wimbledon Park Lake and Southmere in Thamesmead (both 9 hectares).
If you push out to Cambridgeshire, Grafham Water (632 hectares) is the fifth largest lake in England (by area) after Windermere, Rutland, Kielder, and Ullswater.
Oh, and in Hertfordshire, both the Hilfield Park Reservoir and the Wilstone Reservoir are listed at 41 hectares.
Andrew | 02.04.19 - 11:34 a.m. | #
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The database seems very difficult to navigate, but it seems to have a couple you missed in your list.
There is the disused Kempton Park reservoir listed as 16 ha, so slightly bigger than Ruislip Lido.
dg writes: I disregarded this, because it's disused.
There is also the evocatively named "Reservoir No 4" - the most south easterly of the Lea Valley reservoirs in Walthamstow - listed as 28 hectares, which would put it in fifth place, although on the map it looks like two reservoirs separated by a causeway (the database is inconsistent on this point, as the similar one in Stanwell mentioned by John is listed as two separate reservoirs).
dg writes: Having been, it's two reservoirs, so I disregarded this too.
The database has to draw the line somewhere, but I'm surprised it doesn't include the London Docks. Mr Wiki only gives the total water area of the Royals (about 100 hectares) and that of the smallest Royal (King George V Dock, at 26 ha).
timbo | 02.04.19 - 1:18 p.m. | #
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Disused, but not completely drained. Although what's left does look a lot smaller than the Serpentine, for example, so I suspect the database is using the original (pre-1982) area.
dg writes: So, not in the top 10.
The three reservoirs at Barn Elms (which are south of the river) total about 25 hectares but, again, the database lists them separately.
dg writes: So, not in the top 10.
timbo | 02.04.19 - 2:11 p.m. | #
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The ones at Barn Elms are the London Wetland Centre.
I could not find a page on the Lakes Portal explaining why those three are listed separately, but for example the George V Reservoir - physically divided by an earth embankment into two compartments - is listed as a single lake.
An interesting list and website, nonetheless!
Andrew | 02.04.19 - 2:27 p.m. | #
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Thank you - it's very interesting to choose a lake and then tick the box for catchment area, to see what (theoretically) drains into it.
Bob L-S | 02.04.19 - 2:30 p.m. | #
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Nobody's mentioned that in London, there exists a lake (that is actually in regular use) that *hasn't been named yet*.
Busstopm Lake has a nice ring to it.
quin | 02.04.19 - 6:07 p.m. | #
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Looking at my local area, the database seems not to have caught up with recent gravel extraction. I knew it was still happening but hadn't quite realised the scale of it. The UK Lakes Portal seems to say that lakes are identified automatically from OS data (and current maps show the larger size) but perhaps it needs some manual intervention to press an Update button. Broadwater Lake (41907) is now getting on for twice as big as the area marked (you can see it on the underlying aerial view).
The unnamed one just south of it now looks about the size of Savay Lake.
Andrew S | 02.04.19 - 8:28 p.m. | #
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Bewl Water on the Kent/East Sussex boundary is apparently 308 hectares, but it varies a lot with evaporation and extraction
Deborah Moss | 02.04.19 - 8:57 p.m. | #
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Thanks Andrew. And, I know Wimbledon Park very well so that gives me a good idea of what ~10 Hectares looks like to allow me to envision the others.
Ken | 03.04.19 - 8:38 a.m. | #
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You are welcome, Ken. Fortuitously, DG recently visited Ruxley, and he has been to the others before (London Wetland Centre, Wimbledon Park Lake and Southmere).
Andrew | 08.04.19 - 6:24 p.m. | #
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