Editing Lock (water navigation) (section)

===Rise===
The ''rise'' is the change in water-level in the lock. The two deepest locks on the English canal system are [[Bath Locks|Bath deep lock]]<ref>{{cite web | title=Second Lock | work=Images of England | url=http://www.imagesofengland.org.uk/details/default.aspx?id=442716 | archive-url=https://web.archive.org/web/20071116175605/http://www.imagesofengland.org.uk/details/default.aspx?id=442716 | url-status=dead | archive-date=16 November 2007 | access-date=4 September 2006}}</ref><ref>{{cite book |last=Allsop |first=Niall |title=The Kennet & Avon Canal |year=1987 |publisher=Millstream Book |location=Bath |isbn=0-948975-15-6 |url-access=registration |url=https://archive.org/details/kennetavoncanalu0000alls }}</ref> on the [[Kennet and Avon Canal]] and [[Tuel Lane Lock]] on the [[Rochdale Canal]], which both have a rise of nearly {{convert|20|ft|m}}. Both locks are amalgamations of two separate locks, which were combined when the canals were restored to accommodate changes in road crossings. By comparison, the Carrapatelo and Valeira locks on the [[Douro]] river in Portugal, which are {{convert|279|ft|m}} long and {{convert|39|ft|m}} wide, have maximum lifts of {{convert|115|and|108|ft|m}} respectively.<ref>{{cite web|url=https://books.google.com/books?id=aAwvJ5HWPIcC&pg=PA297|title=Final Report of the International Commission for the Study of Locks|work=Google Books|access-date=20 May 2013}}</ref> 

The two [[Ardnacrusha power plant|Ardnacrusha]] locks near [[Limerick]] on the Shannon navigation in Ireland have a rise of {{convert|100|ft|m}}. The upper chamber rises {{convert|60|ft|m}} and is connected to the lower chamber by a tunnel, which when descending does not become visible until the chamber is nearly empty.<ref>{{cite web|url=http://irishwaterwayshistory.com/abandoned-or-little-used-irish-waterways/the-lower-shannon/shannon-south/the-esb-lock-at-ardnacrusha/|title=The ESB lock at Ardnacrusha |date=22 July 2009 |publisher=Irish Waterways History |access-date=2012-03-23}}</ref>