SJ5242 : Grindley Brook Lock No 3 in Shropshire

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

Grindley Brook Lock No 3 in Shropshire
Grindley Brook Lock No 3 in Shropshire
Narrowboats enter the bottom lock of the three lock staircase here by the Chester Road Bridge (No 29).
Leakage round the gates in this image reveals that the lock is full, so either boats are on already the way up, or the lock has been filled ready for a boat to come down.
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.

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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
Canals 
Subject Location
OSGB36: geotagged! SJ 5239 4293 [10m precision]
WGS84: 52:58.8952N 2:42.6335W
Camera Location
OSGB36: geotagged! SJ 5240 4295
View Direction
South-southwest (about 202 degrees)
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Lock  Staircase Locks 

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