FISH-PASS Russian patent published in 2008 - IPC E02B8/08 

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

SUBSTANCE: fish-pass comprises fish-passing path made as pressure waterway with round cross-section and having outlet head connected with upper pool of hydrosystem and inlet head communicated with lower pool thereof. Fish-pass comprises swimming-in orifices and discrete roughness members distributed along fish-passing path and forming segment-sized transversal partitions. Discrete roughness members are shifted one from another and define swimming-in orifices arranged along imaginary sinusoidal line, which is formed by radial transversal partition displacement relatively longitudinal axis of pressure waterway. Transversal partition edges form through axial channel, which is coaxial to pressure waterway.

EFFECT: provision of conditions favorable for fish movement along fish-passing path.

7 cl, 8 dwg