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

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

SUBSTANCE: fish pass comprises fish passing channel made as a tray having transversal partitions with flowing-in orifices. The fish passing channel connects upper and lower hydrosystem pools. The fish pass also has flow energy dissipation means installed inside the fish passing channel and made as continuous flexible bands extending along fish passing channel and supported by tension guiding pulleys arranged in depressions. The depressions are formed in fish passing channel tray and the pulleys are buried inside the depressions. The pulleys may be moved by drive. Rough members are fixedly fastened to outer surfaces of flexible belts. Leading rollers of flexible continuous belts are connected to the drive. Tray bottom is provided with horizontal parts and parts having longitudinal inclinations towards lower pool. Upper ends of inclined parts are joined with horizontal parts by means of transversal partitions having flowing-in orifice. Recesses are created in bottoms of inclined parts, wherein the recesses and bottom flowing-in orifices are axially aligned with each other.

EFFECT: creation of effective hydraulic conditions to permit fish passage into upper pool.

7 cl, 14 dwg