SJ5242 : Grindley Brook staircase locks (detail) in Shropshire

taken 6 years ago, near to Grindley Brook, Shropshire, Great Britain

Grindley Brook staircase locks (detail) in Shropshire
Grindley Brook staircase locks (detail) in Shropshire
This image shows the bottom gates of the middle lock in the staircase. The water from the lock flows directly into Lock No 3, below and to the left of the gates.

See: SJ5242 : Grindley Brook Lock No 3 in Shropshire
Staircase locks

In a staircase the upper gate of one lock is also the lower gate of the one above it. Operating a staircase is very different from operating a flight. It can be more useful to think of a staircase as a single lock with intermediate levels. As there is no intermediate pound, a chamber can only be filled by emptying the one above, or emptied by filling the one below; thus the whole staircase has to be full of water (except for the bottom chamber) before a boat starts to ascend, or empty (except for the top chamber) before a boat starts to descend. In an apparent staircase the chambers still have common gates, but the water does not pass directly from one chamber to the next, going instead via side ponds. This means it is not necessary to ensure that the flight is full or empty before starting. Examples of real staircases are Bingley and Grindley Brook. Examples of apparent staircase locks are Foxton Locks and Watford Locks on the Leicester Branch of the Grand Union.

Grindley Brook Locks

There are six locks in the Grindley Brook flight on the Llangollen Canal. The lower three are individual locks allowing a rise of 19 feet (about 58 metres), and the top three are a single three-lock staircase providing a further rise of 19ft 11in (about 61 metres).

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SJ5242, 121 images   (more nearby search)
Photographer
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Date Taken
Thursday, 17 September, 2015   (more nearby)
Submitted
Friday, 30 December, 2016
Geographical Context
Village, Rural settlement  Canals 
Subject Location
OSGB36: geotagged! SJ 5238 4291 [10m precision]
WGS84: 52:58.8843N 2:42.6423W
Camera Location
OSGB36: geotagged! SJ 5238 4292
View Direction
South-southeast (about 157 degrees)
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Other Tags
Lock  Staircase Locks  Lock Gates 

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Image Type (about): close look 
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