FISH PASS Russian patent published in 2007 - 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 canal, which connects upper and lower pools, as well as inlet head made as hollow cylinder with rotary gutters of rectangular cross-sections. The rotary gutters may rotate in horizontal plane about hollow cylinder axis by means of drive. Rotary gutter bottoms are connected with guiding means, which are radial to cylinder having walls of corrugated material. The corrugated material is placed in gaps between rotary gutter outlets and fish-passing canal inlet. Upper and lower edges of corrugated material are secured to annular guiding means. Outer edges thereof are connected to side walls of rotary gutters and fish-passing canal. Rotary gutter width is less than that of fish-passing canal. Fish-pass has additional feeding unit connecting hollow cylinder interior with upper pool through supply waterway. Supply waterway end is coaxial to hollow cylinder and closed with grid. Outlet orifice of additional feeding unit is provided with deflector, which is coaxial thereto and having concave surface facing additional feeding block. Deflector and hollow cylinder bottom define slot-like orifice extending along outer deflector edge perimeter.

EFFECT: improved conditions for fish attraction from lower pool.

5 cl, 21 dwg