(under the class definition) Device wherein the closure is mounted in or adjacent a stream bed to extend thereacross and to impede passage of objects therethrough, and wherein the closure is opened by the presence of abnormal amounts of water, e.g., flood stage.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21, for a closure released for movement or directly actuated by an ambient fluid, e.g., rain or snow.
131, for a closure pivoted adjacent its lower edge so that in open position it lies upon or below the surface upon which it is mounted.
SEE OR SEARCH CLASS
256, Fences,
13, for fence panels which are not mounted for movement, but are particularly adapted for use on shores or in beds of streams.
405, Hydraulic and Earth Engineering,
87+, for gates or closures adapted to regulate the height of a water level.
