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
Narrowboat "Ottar", one of the Viking Afloat hire fleet, has entered bottom lock of the staircase and the crew is closing the gates separating it from the middle lock, No 2.
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 5238 4291 [10m precision]
WGS84: 52:58.8843N 2:42.6423W
Camera Location
OSGB36: geotagged! SJ 5238 4292
View Direction
SOUTH (about 180 degrees)
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Other Tags
Narrowboat  Staircase Locks  Lock 

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