Canal & River Locks
Page 4: Illustrations
In November 2004 the Hiram M. Chittenden Locks were emptied for maintenance. This provided an opportunity to visualize how a lock works without water obscuring the bottom of the lock. For reference the picture above on the far left shows the lock in operation with a tug and barge, loaded with sand and gravel bound for a nearby concrete mixing plant, waiting for the gates to open. The cutout in the side wall in the bottom left corner of the picture contains the gate when open.
The lock has three pairs of gates, one pair at each end and one pair in the middle so that half the length of the lock can be used when whole length of the lock is not required thus saving water. The last three pictures show from left to right, the low water end of the lock, the center pair of gates and the high water end of the lock. The person walking on the bottom near the middle of the lock in the second picture from the left gives a measure of the size of the lock. In the pictures of both ends of the lock the string of penstock openings are visible along the sides at the bottom. The water entering and leaving the lock flows by gravity through these openings. It requires around 15 minutes to fill or empty the lock.
Pictures below depict various lock operations:
Tug and barge in lock when full.
|Lock emptied for maintenance.||Lock emptied for maintenance.|
|Lock emptied for maintenance.||Gate opening mechanism.|
Page 1 - Introduction & use of locks...Go
Page 2 - Basic construction and operation...Go
Page 3 - Details & Terminology...Go
Page 4 - Variations...Go
Page 5 - Illustrations...(Current page)
Page 6 - History & Development...Go
Page 7 - Use of water...Go
Page 8 - Alternatives...Go