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 fish passing channel, which connects upper pool of hysrosystem with lower pool by means of outlet and inlet heads, transversal partitions extending for the full fish passing channel length and defining working chambers. Fish pass also has surface swimming-in orifices formed in transversal partitions and arranged in different longitudinal cross-sections, water intake orifices closed with fish arresting grid and formed in each working chamber bottom in front of surface swimming-in orifice. Fish pass comprises bottom discharge manifold communicated with water intake orifices and arranged under fish passing path and connected with lower pool. Outlet orifices are created in bottom of each working chamber in front of swimming-in orifice from lower pool side. Water intake orifices are located upstream of surface swimming-in orifice from upper pool side. Water intake orifices are connected with outlet orifices by bottom discharge manifold. Outlet orifices are closed with fish arresting grid.

EFFECT: provision of effective hydraulic conditions for fish passage to upper pool of hydrosystem.

4 cl, 10 dwg