TQ4179 : Thames Flood Barrier

taken 3 years ago, near to London City Airport, Newham, Great Britain

This is 1 of 12 images, with title Thames Flood Barrier in this square
Thames Flood Barrier
Thames Flood Barrier
Taken during the 'underspill' position which happens once the barrier has been closed by raising the gates by ninety degrees (TQ4179 : Detail of Thames Flood Barrier). "As the tide continues to come in, a higher level of water will build up downstream of the barrier creating a differential in water level on either side of the gates. Shortly after high water or high tide, the gates will be further rotated by 28 degrees (or roughly 2 metres) into what is called the ‘underspill’ position. Underspill allows the higher downstream water level of the river to rush through underneath the gates to shorten the amount of time it takes for the upstream and downstream water levels to equal. It also creates a white rush effect of water behind each of the gates, attracting many birds which come to feed on the small fish interested in the white rush water and the food it provides." (Info from the Environment Agency.)
More general info about the barrier here: TQ4179 : Thames Barrier closed, upstream.
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TQ4179, 445 images   (more nearby )
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Date Taken
Sunday, 27 September, 2015   (more nearby)
Tuesday, 29 September, 2015
Geographical Context
Rivers, Streams, Drainage 
Subject Location
OSGB36: geotagged! TQ 4148 7938 [10m precision]
WGS84: 51:29.7399N 0:2.2016E
Camera Location
OSGB36: geotagged! TQ 4147 7927
View Direction
NORTH (about 0 degrees)
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Image classification(about): Geograph
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