A control gate for a channel or pond adapted to be installed across a channel for liquids. The control gate includes: at least two panels hingedly connected together, the panels having opposing sides in sealing engagement with side walls of the channel, a lowermost panel being in sealing engagement with the floor of the channel. The panels are substantially vertically aligned in a fully closed position of the control gate. At least one first lifting element is connected to the top of an uppermost panel and is adapted to lower and raise the uppermost panel relative to its hinged connection in a concertina manner to provide an overshot position for the control gate. At least one second lifting element is connected to the bottom of the lowermost panel to raise and lower the lowermost panel from the floor of the channel to provide an undershot position for the control gate.

A control gate for a channel or pond adapted to be installed across a channel for liquids. The control gate includes: at least two panels hingedly connected together, the panels having opposing sides in sealing engagement with side walls of the channel, a lowermost panel being in sealing engagement with the floor of the channel. The panels are substantially vertically aligned in a fully closed position of the control gate. At least one first lifting element is connected to the top of an uppermost panel and is adapted to lower and raise the uppermost panel relative to its hinged connection in a concertina manner to provide an overshot position for the control gate. At least one second lifting element is connected to the bottom of the lowermost panel to raise and lower the lowermost panel from the floor of the channel to provide an undershot position for the control gate.

An optical fiber sensing system according to the present disclosure includes an optical fiber (10) provided on a water discharge gate (30) of a reservoir or in a vicinity of the water discharge gate (30), a reception unit (21) configured to receive an optical signal including a vibration pattern from the optical fiber (10), and a detection unit (22) configured to detect whether an opening amount of the water discharge gate (30) is appropriate, based on a vibration pattern included in the optical signal.

The present invention relates to a retractable floodwall unit that comprises a foundation unit having a plurality of guide tracks along side walls of the foundation unit, a floodwall panel stowed in the foundation unit; and a power system for raising and lowering the floodwall panel. The foundation unit includes a first housing unit enclosing an actuator of the power system, and the floodwall panel includes a plurality of guides that mate with the guide tracks of the foundation unit.

An Herodotus machine, or bottom-source, up-stair, hybrid pump and step lock system, includes synchronized reciprocating cross-gate displacers with commonly synchronized gates and floating body movers; specifically including a sequence of ascending adjacent step locks separated by gates with reciprocating gears on axles aligned over respective gates. A chain over each reciprocating gear has a displacer on each end, with one displacer in the upper lock and the other displacer in the lower lock. Rotating first, the downstream displacer descends to raise the lower lock water level, while the upstream displacer rises to lower the upper lock water level, and vice versa on the reverse gear rotation. Displacers are sized such that water levels in alternate pairs of upper lock and lower lock are made the same. The gate is then opened and a watercraft can be transferred from the lower lock to the upper lock or vice versa.

A configurable modular dam gate hoist system is disclosed. The dam gate hoist system includes a first hoist support frame, second hoist support frame, first side segment with a first adjustable hoist drum, second side segment with a second adjustable hoist drum, a hoist drive assembly, and optionally a middle segment. The middle segment, when utilized, is constructed of pre-made components with set lengths in the factory, with the length of the middle segment being varied by using components with different set lengths. Both the first and second side segments include an adjustment slot or keyway that receives adjustment bolts (preferably including standard square keys) of the first and second adjustable hoist drum to allow the position of the drums to be adjusted and secured in the desired location on the tube to correspond with the desired fleet angle of the gate chain, cable, or wire rope.

A configurable modular dam gate hoist system is disclosed. The dam gate hoist system includes a first hoist support frame, second hoist support frame, first side segment with a first adjustable hoist drum, second side segment with a second adjustable hoist drum, a hoist drive assembly, and optionally a middle segment. The middle segment, when utilized, is constructed of pre-made components with set lengths in the factory, with the length of the middle segment being varied by using components with different set lengths. Both the first and second side segments include an adjustment slot or keyway that receives adjustment bolts (preferably including standard square keys) of the first and second adjustable hoist drum to allow the position of the drums to be adjusted and secured in the desired location on the tube to correspond with the desired fleet angle of the gate chain, cable, or wire rope.

The invention relates to a method for controlling a water sluice gate drive for a water sluice gate, in particular for a roller sluice gate, preferably in a hydroelectric power plant, wherein the drive has an electric machine, in particular has an asynchronous machine, in particular an asynchronous motor/generator. According to the invention, it is provided that the electric machine, in particular an asynchronous machine, has a fan brake, wherein the method comprises the steps of: disengagement of the fan brake in the case that an insufficient power supply is indicated, self-actuated operation of the electric machine, in particular an asynchronous machine, wherein the electric machine, in particular an asynchronous machine, is operated in generative island operation, in which a rotating field is generated in a self-actuating manner.

The invention relates to a method for controlling a water sluice gate drive for a water sluice gate, in particular for a roller sluice gate, preferably in a hydroelectric power plant, wherein the drive has an electric machine, in particular has an asynchronous machine, in particular an asynchronous motor/generator. According to the invention, it is provided that the electric machine, in particular an asynchronous machine, has a fan brake, wherein the method comprises the steps of: disengagement of the fan brake in the case that an insufficient power supply is indicated, self-actuated operation of the electric machine, in particular an asynchronous machine, wherein the electric machine, in particular an asynchronous machine, is operated in generative island operation, in which a rotating field is generated in a self-actuating manner.

A configurable modular dam gate hoist system is disclosed. The dam gate hoist system includes a first hoist support frame, second hoist support frame, first side segment with a first adjustable hoist drum, second side segment with a second adjustable hoist drum, a hoist drive assembly, and optionally a middle segment. The middle segment, when utilized, is constructed of pre-made components with set lengths in the factory, with the length of the middle segment being varied by using components with different set lengths. Both the first and second side segments include an adjustment slot or keyway that receives adjustment bolts (preferably including standard square keys) of the first and second adjustable hoist drum to allow the position of the drums to be adjusted and secured in the desired location on the tube to correspond with the desired fleet angle of the gate chain, cable, or wire rope.