FIELD: construction.
SUBSTANCE: fish pass for high-head water development is installed in a water development dam site. The fish pass is arranged in the form of an open staged, inclined or inclined-staged overflow tray 1 of a fish bypass channel, connecting upper and lower water development reaches. Inside the water overflow tray 1 of the fish bypass channel the vertical transverse partitions 2 and 3 are installed with swim-in holes 4 and 5 accordingly. Transverse partitions 2 form fish pass chambers 6, 7, 8, 9, 10 and 11 between each other. Transverse partitions 3 with swim-in holes 5 are framed with flow-forming aprons 12, where systems of jet-forming nozzles 14 are installed under their coverages in galleries 13. At the same time systems of jet-forming nozzles 14 are directed towards the above fish pass chamber and are installed at the angle or in parallel to the axis of the swim-in hole 5. Pairs of near transverse partitions, where in one above transverse partition 3, included into this pair, the swim-in hole 5 is equipped with a system of jet-forming nozzles 14, and on the other below transverse partition 2 from the same pair the swim-in hole 4 without a system of jet-forming nozzles 14, there are fish pass reservoirs created for recreation 15. Fish pass reservoirs for recreation 15 divide the fish pass into sections. Fish pass sections may comprises an identical number of fish pass chambers 6, 7, 8, 9, 10 and 11. Besides, fish pass sections may comprise different numbers of fish pass chambers, moreover, the quantity of chambers in the fish pass section regularly reduces towards the upper reach. Besides, the fish pass sections may form one fish pass flight, creating a single-flight fish pass. Besides, the fish pass sections may form several opposite fish pass flights, creating a multiple-flight fish pass.
EFFECT: improved conditions for attraction of fish into a fish pass and considerable increase in efficiency of its passage from the lower reach of a high-head water development to areas of spawning.
7 cl, 6 dwg
