lockfuln.
/ˈlɒkfʊl/, U.S. /ˈlɑkˌfʊl/ As much water as will fill a canal or river lock.
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the world > the earth > water > body of water > channel of water > [noun] > navigable waterway > canal > lock or chamber > as much as will fill a lock
lock1760
lockfula1792
a1792 J. Smeaton Reports (1797) I. 16 One lockful to each boat..is..a very inconsiderable quantity.
1811 Two Rep. Commissioners Thames Navigation 25 The Canals, some of which have no water..pay heavily for every lockfull forced up by steam-engines.
1837 Civil Engineer & Architect's Jrnl. 1 44/2 Making 6740 cubic feet or 46,243¾ gallons of water to each lockful.
1981 Jrnl. Operational Res. Soc. 32 649 Sometimes, if two boats going in the same direction arrive at the lock together, they will share it, thereby using only one lockful of water rather than two.
2013 S. Fisher Brit. River Navigations 5 The introduction of pound locks, which released only one lockful of water with each passage, was thus a significant improvement.
This entry has been updated (OED Third Edition, December 2015; most recently modified version published online March 2022).
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n.a1792