FISH PASS Russian patent published in 2006 - IPC E02B8/08 

FIELD: hydraulic structures, particularly permitting fish passage through support structures to fish hatchery and growth areas.

SUBSTANCE: fish pass comprises tray-like channel, which connects upper and lower hydrosystem pools, flow kinetic energy dissipation device made as jet-forming nozzles arranged in side tray walls and connected with pressure pipeline. Jet-forming nozzle orifices are directed towards main flow running along fish pass channel tray. Fish pass also has swimming-in orifices defined by vertical transversal partitions and provided with additional jet-forming nozzles facing main flow. Outlet orifices of additional jet-forming nozzles and that of main ones are discretely distributed through water layer in tray. Depressions widened in upper pool direction are created in longitudinal plane of outlet orifice location coaxially to jet-forming nozzles. The depressions are shaped as truncated cones. Additional jet-forming nozzles are created on side walls of roughness member arranged in bottom part in longitudinal fish pass channel axis in transversal section defined by vertical transversal partitions and facing swimming-in orifice by obtuse end thereof. Side walls of roughness member extend at acute angle to longitudinal fish pass channel axis.

EFFECT: increased efficiency of fish pass flow regulation.

5 dwg