Brian, see this thread, think it is a broken coastline.
https://lists.openstreetmap.org/pipermail/talk/2014-August/070493.html

Phil (trigpoint )


On Mon Aug 18 2014 19:33:04 GMT+0100 (BST), Brian Savidge wrote:
> Looking around a bit more, it looks like Stroud is also suffering problems 
> where its submerged when the zoom level is at 500m (all other zoom levels 
> seem fine for that area).  I've tried zooming around other parts of the UK 
> and this problem doesn't seem to exist, so I can only guess its a local 
> problem around the river Severn.  Further up the Severn valley, Tewkesbury 
> seems to be flooded at 1km zoom range and below, with different tiles being 
> marked as flooded depending on the zoom.
>  
> From: [email protected]
> To: [email protected]
> Date: Mon, 18 Aug 2014 18:18:33 +0000
> Subject: Re: [Talk-GB] River Severn Dried up in places
> 
> 
> 
> 
> I should have said, you see different things at different zoom levels
>  
> From: [email protected]
> To: [email protected]
> Date: Mon, 18 Aug 2014 18:15:42 +0000
> Subject: [Talk-GB] River Severn Dried up in places
> 
> 
> 
> 
> What has gone wrong with the River Severn around Sharpness, near Berkeley, 
> Gloucestershire?
>  
> It looks like someone has been adding in the sand banks at the same level as 
> the waterway=riverbank.  My guess is OpenStreetMap doesn't know which one 
> takes priority and the sandbanks have won.  I am also assuming OpenStreetMaps 
> doesn't draw the maps according to the tide.
>  
> There seem to be other tidal features along the Severn such as tidal 
> reservoir which don't seem to be causing problems.  Should the tidal features 
> have a specific level so that they can be seen, presumably level 2 would be 
> the best or is there a better way to resolve this issue?
>  
>  
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