| 摘要 |
PROBLEM TO BE SOLVED: To provide a siphon type pipe fishway with satisfactory maintainability while preventing a change in the flow rate of a passway for fish going upstream due to water level fluctuation of a river. SOLUTION: The siphon type pipe fishway 10 securing the passway for fish going upstream includes: a bendable pipe 13 including a water inlet 11 submerged in water upstream of a level difference provided in the river, and a water outlet 12 submerged in water downstream of the level difference; flow velocity adjusting means 15, 16, 17, 18 provided at the end or intermediate positions of the pipe 13 having openings 14 whose diameters forming the fishway is 1/5 to 4/5 of the inner diameter of the pipe 13; and a support member 19 for fixing the pipe 13 at least to the upstream side of the level difference of the river or to the level difference of the river. COPYRIGHT: (C)2011,JPO&INPIT |
