Safety gate
From BAWiki
Definition
A safety gate (also called a lock gate) prevents the run-out after a dam break in a channel. Safety gates are also used to drain water out of the channel by portions for maintenance operations, e.g. 2006 in the Elbe-Seiten-Kanal.
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Source
Wörterbuch Wasserbau und Wasserwirtschaft, Deutsch-Englisch, Pohl, Reinhard, Shaker Verlag, Aachen, 2006; translated from http://www.schiffundtechnik.com/lexikon/s/sicherheitstor.html (retrieved 17.03.2017) by Alejandro and Hannah Carrizo.