Patent ID: 6273639
Filing Date: 2001-08-14
Classification: E02B,Y02A,Y10T

Abstract:
Apparatus for facilitating migration of fish past dams and other barriers in waterways, the apparatus comprising:a conduit passing from a downstream side of a water barrier to an upstream side of said barrier;a first flow controlling valve disposed within said conduit, said first valve adapted to provide a substantially uniformly turbulent flow within said conduit at a downstream side of said valve when open and a substantially decreased flow when closed;a second flow controlling valve disposed within said conduit, said second valve adapted to provide substantially uniform turbulent flow within said conduit when opened and a substantially decreased flow when closed; andfirst and second actuator means to open and close said first and second valves sequentially, so that a fish-holding zone is created between said valves and fish may sequentially pass through said first and then said second valve.