FISH PASS 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 accumulation basin located between spillway dam spans, supply unit made as gate arranged in outlet part of fish accumulation basin. Fish pass also has means for fish calculation and inspection, urging means, which may perform longitudinal movement in fish accumulation basin. Fish accumulation basing bottom level is below apron level. Outer part of fish accumulation basin is coupled to lower pool of hydrosystem by means of bottom projections. Projections have side edges adjoining side walls of fish accumulation basin so that an angle is created between side edges and the side walls in plan view. Side edges of the projections define supply channel. Channel bottom level is above apron level. Supply channel width in fish accumulation basin inlet section is equal to fish accumulation basin inlet width. Toe basin adjoins fish accumulation basin and spillway dam spans. Tops of bottom projections are in common plane along length thereof. Inlet part of supply channel facing lower pool mates the apron by means of ramp having reverse slope or supply channel bottom from fish accumulation basin inlet section to apron connection section has reverse slope.

EFFECT: increased efficiency of bottom fish attraction.

7 cl, 9 dwg