SP5968 : Watford top Lock in Northamptonshire

taken 6 years ago, near to Watford, Northamptonshire, Great Britain

Watford top Lock in Northamptonshire
Watford top Lock in Northamptonshire
Grand Union Canal (Leicester Section).
The Watford flight of locks in Northamptonshire contains seven locks, including one staircase of four. The total rise in water level provided is 52ft 6in (16 metres).

The image shows a narrowboat entering Watford Top Lock (No 7). The open gate on the left is part of Lock No 6, the top chamber of the staircase four. It has been left open because some boats waiting to descend are queueing beyond the top lock. The men in blue are lock staff supervising the orderly passage of boats up and down the flight.

Jo Turner writes:
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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SP5968, 194 images   (more nearby )
Photographer
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Date Taken
Thursday, 22 August, 2013   (more nearby)
Submitted
Sunday, 5 August, 2018
Geographical Context
Canals 
Subject Location
OSGB36: geotagged! SP 5930 6887 [10m precision]
WGS84: 52:18.8846N 1:7.8918W
Camera Location
OSGB36: geotagged! SP 5930 6883
View Direction
NORTH (about 0 degrees)
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Other Tags
Narrowboat  Lock  Flight of Locks  Staircase Locks 

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