Abstract: Disclosed herein is an environmentally-friendly safety weir with both a waterway and a fishway. The safety weir includes a waterway pipe (100), a fishway pipe (200), and a control unit (300). The waterway pipe includes: a horizontal waterway pipe (110) that is provided on an embankment; a vertical waterway pipe (120) that extends from each of opposite ends of the horizontal waterway pipe downward; a bottom waterway pipe (130) that horizontally extends from the vertical waterway pipe outward; and a water entering-and-exiting pipe (140) that extends from the bottom waterway pipe upward. The fishway pipe is provided on the waterway pipe and is configured such that the level of water in the fishway pipe is controlled by adjusting the amount of air in the fishway pipe. The control unit includes: a first air supply pipe that is connected to the waterway pipe; and a second air supply pipe that communicates with the fishway pipe.

Abstract: Disclosed herein is an environmentally-friendly safety weir with both a waterway and a fishway. The safety weir includes a waterway pipe (100), a fishway pipe (200), and a control unit (300). The waterway pipe includes: a horizontal waterway pipe (110) that is provided on an embankment; a vertical waterway pipe (120) that extends from each of opposite ends of the horizontal waterway pipe downward; a bottom waterway pipe (130) that horizontally extends from the vertical waterway pipe outward; and a water entering-and-exiting pipe (140) that extends from the bottom waterway pipe upward. The fishway pipe is provided on the waterway pipe and is configured such that the level of water in the fishway pipe is controlled by adjusting the amount of air in the fishway pipe. The control unit includes: a first air supply pipe that is connected to the waterway pipe; and a second air supply pipe that communicates with the fishway pipe.

Abstract: A safe fish guide path structure includes a horizontal tube having an intake and exhaust valve for controlling levels of air having lower viscosity than water. The horizontal tube is equipped with a transparent window at both sides about the intake and exhaust valve. The horizontal tube is installed at a weir or a bank. An inclined tube extends horizontally from both sides of the horizontal tube. An extended tube extends horizontally from an end portion of the inclined tube. An inlet tube extends from an end portion of the extended tube toward an upper side, while communicating with the extended tube, with water flowing through the inlet tube. A cover has an insertion groove at one side into which the extended tube is inserted, and a cut-away groove at the other side for water to flow through the cutaway groove.