SP5968 : Lock No 4 at the Watford staircase in Northamptonshire

taken 9 years ago, near to Watford, Northamptonshire, Great Britain

Lock No 4 at the Watford staircase in Northamptonshire
Lock No 4 at the Watford staircase 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).

This image shows the second lock up in the staircase (Lock No 4), and two of the sideponds. In this kind of staircase a lot of water is conserved by correct use of the red paddles connecting the locks to the sideponds. Link

SP5968 : What are these side pounds for?

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, 201 images   (more nearby search)
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 5923 6878 [10m precision]
WGS84: 52:18.8365N 1:7.9544W
Camera Location
OSGB36: geotagged! SP 5928 6877
View Direction
West-northwest (about 292 degrees)
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Staircase Locks  Canal Sidepond 

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