Patent ID: 11920314
Assignee: PERCHERON POWER, LLC
Field: Civil engineering (Other fields)
Classification: CPC E  Y | IPC E

Claim 12:
13. A fish pass system, comprising:
a helical blade including:
a first side surface opposite a second side surface, the first side surface extending along a helical length of the helical blade;
an outside diameter extending between the first side surface and the second side surface along the helical length of the helical blade; and
an inside diameter extending between the first side surface and the second side surface along the helical length of the helical blade, the inside diameter for controlling a flow of water in a first direction from the first side surface to the second side surface along the helical length of the helical blade, the inside diameter defining an open center of the fish pass system,

wherein fish traveling in a second direction opposite the first direction pass through the fish pass system by respective volumes of water contained in respective spaces between adjacent turns of the helical blade, and
fish traveling in the first direction pass through the open center of the fish pass, and
wherein the helical blade is a first blade segment of a plurality of blade segments, the fish pass system further comprising a second blade segment of the plurality of blade segments, the first blade segment overlapping the second blade segment from the outside diameter of the helical blade to the inside diameter of the helical blade.