FISH PASS (VARIANTS) Russian patent published in 2007 - IPC E02B8/08 

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

SUBSTANCE: fish pass comprises fish-passing path created as canal having inlet head connected to upper pool of hydrosystem and outlet head connected to lower pool thereof, intermittent transversal partitions serially installed along fish-passing path so that chambers are created in-between, swimming-in orifices made as vertical slots defined by transversal partition sides and bottom transversal parts thereof and inclined with respect to fish-passing path sides and bottom. Bottom transversal parts of transversal partitions have triangular overflows. In accordance to the first variant transversal partitions are water-permeable and have sides constituted of horizontal bars grouped in rows arranged in a partition-thickness direction and spaced apart along sides. Partition bottom parts are formed of bars grouped in rows arranged in bottom transversal part thickness direction. Bars have round cross-sections. In accordance to the second variant transversal partition side planes are oblique to fish-passing path bottom. Bottom transversal parts of transversal partitions extend along broken line having V-shape in plane view. Top of V-shaped broken line faces flow. In accordance to the third variant transversal partition sides are inclined to fish-passing path sides and have end parts adjoining fish-passing path sides and facing upper pool. Bottom transversal parts of transversal partitions extend at an angle to fish-passing path bottom and are inclined towards lower pool. Transversal partition sides are oblique to fish-passing path bottom.

EFFECT: possibility to create hydraulic conditions, which facilitate fish movement along fish pass.

22 cl, 33 dwg