Abstract: A flap weir with a base wall arranged between two side walls, a flap is fixed and sealed in a non-rotary manner by one longitudinal edge to the base wall, the other longitudinal edge forming an overflow edge. The flap is modified by natural deformation occurring as a result of the action of increased water pressure bearing on it.

Abstract: The arrangement includes a downstream jack pivotably mounted about an axis in the floor of the dam and a rotating abutment member carried by the wicket for receiving an end of a jack piston rod. The jack is restored to an end angular orientation when the piston rod is moved away from the abutment member. This end angular orientation is determined by the axis joining the end upright position of the abutment member and the end down position of the abutment member. The piston rod of the jack and the abutment member are provided with a coupler for ensuring their engagement. The jack body is fitted with a sealing apparatus pivotably mounted about the same axis in the floor of the dam and out of which the jack body is easily removable.

Abstract: An irrigation water control gate for controlling the amount of water delied downstream. The gate includes a frame and a pair of panels in the frame hingedly connected at adjoining horizontal side edges and forming a wedge shape extending upstream. The upper panel forms the crest of the gate which is raised or lowered on cables. Water level sensing means positioned above the crest for movement with the crest activates control means and cable driving means to move the crest so that water flowing over the crest is maintained at a constant depth.

Abstract: In one embodiment, the invention is directed to a hydraulic lifting module hich is removable as a unit from a wicket dam. A hydraulic cylinder is pivotably mounted about an axis in the frame and extends outwardly of an apertured cover between extreme positions. A slidable shield is secured and is pivotable with a portion of the cylinder extending out of the cover for closing the aperture and the extreme positions of the cylinder. A flexible boot interior of the frame renders the housing water and silt resistant.

Abstract: A weir construction has a weir gate which is tiltable around an axis suspended in a canal section above the bottom thereof, whereby the axis is situated between, and at a distance from, the lower and the upper edge of the weir gate closer to the lower edge of the weir gate than to the upper edge thereof, which weir gate cooperates with a floating counterweight for opening and closing thereof by rotation around the axis. In order to obtain an improved sealing of the weir gate and the canal section, a flexible seal strip is provided between the lower edge of the weir gate and the bottom of the canal section, which seal strip allows curvilinear movement of the weir gate lower edge and prevents flow of water between the lower edge of the weir gate and the bottom of the canal section.

Abstract: An automatic swing fishway apparatus for allowing fish to swim upstream can be installed in dams or weirs to accommodate fluctuations in upstream water levels. The apparatus includes a hydraulic chamber in a bottom of a waterway which bypasses a dam, and a fishway device body. The fishway device body includes a fishway portion in which a plurality of dividing walls are located vertically on a floor plate provided above the hydraulic chamber and a buoyant sealed portion is provided beneath a floor. The fishway device body also includes a main shaft arranged on a downstream side so that the fishway device body can rotate freely. The hydraulic chamber is connected to an upstream end of the fishway device body through an overflow weir and the hydraulic chamber is connected to a downstream waterway via an outflow port.

Abstract: The invention concerns a weir with an on a horizontal axis tilting gate (1). The control is automatic and completely mechanical and operates without an external source of energy. The control uses a float/counterweight (4) placed in an enclosure (5) which is in connection with the upstream level. The float/counterweight (4) is connected to the equator (13) on the gate (1) by a transmission mechanism consisting of (7), (10) and (11). The float/counterweight (4) is in balance with the hydraulic forces on the gate (1). The tilting axis is placed about 0.4 of the height of the gate (1) from the underside.During large discharges the gate (1) tilts further to increase the flow. This enables the weir to establish within shorter time the desired level. A horizontal submerged grate (15) prevents choking of the weir.The gate (1) can adjusted vertically by a leadscrew (16) to set the weirlevel. A threshold-beam (20) is connected to guidings (17) to the gate-equilibrium by every adjusted height.

Abstract: The gate of the present invention regulates the level of a downstream reach (4) by means of a sector-shaped plate (1) carried by a frame (6, 7) that oscillates about a axis (5) and that also carries a float (8) dipping into said reach. Substantially neutral equilibrium is obtained at a reference level by raising the center of gravity above the oscillation axis, and the reference level is adjusted by transferring water between two longitudinally offset tanks (11, 13). The invention is particularly suitable for irrigation networks.

Abstract: A method and apparatus for controlling an upstream water level by adjusting the elevation of a trough assembly of a weir. The weir is a open frame within which is slidably mounted a trough assembly, which may be raised or lowered by means of a tandem screw jack assembly, which caps the open frame. The perimeter of the open frame is lined with a continuous J-shaped neoprene seal, which provides a smooth slidable surface for movement of the trough assembly. The J-shaped seal also provides a substantially water tight barrier between the trough assembly and the open frame. Two vertical screw shafts extend downwardly from the tandem screw jack assembly and are bolted to the trough assembly. By rotating a hand crank, the vertical screw shafts raise or lower the trough assembly.

Abstract: This invention relates to river control structures, of the kind known as upstream tilting gates. A structure in accordance with the invention includes a chamber, (1, 2, 3 and 4) and a tilting platform (5). The upstream end of the platform includes a curved transverse wall (10), consisting of a plurality of leaves (12 and 13). When the platform is raised, the leaves provide a continuous wall between the platform and the top of the chamber, while when the platform is lowered, the leaves slide behind each other and are accommodated in the chamber. The structure also includes a channel (7, 8 and 9), extending along the length of the platform. The channel is provided with baffles to limit the flow of water down the channel, to enable fish to surmount the structure.

Abstract: Illustrative embodiments of the invention are directed to a technique for raising and lowering large tainter gates. Typically, two groups of lifting apertures are formed in the gate. A lifting mechanism, resiliently mounted on the tainter gate pier, inserts a movable pin into an aperture in one of the two groups and draws the gate upwardly. A stationary pin on the lifting mechanism then is inserted into an aperture in the other of the two groups to absorb the gate load while the movable pin is withdrawn and moved to a new aperture in order to continue the step-wise lifting process.To lower a gate, an essentially reverse procedure is followed.

Abstract: A sluice gate is provided in the form of a vane wheel on a horizontal shaft mounted transversally across the sluice in which it is installed, said vanes being distributed about the shaft and being partially immersible for the purpose of gate operation, same said vanes providing different sluice closing surface areas and said sluice gate comprising wheel locking means to maintain the vanes fixedly in the sluice. Application in small irrigation sluices is suggested.

Abstract: An improved penstock for water-flow control provides the capability of establishing a constant water level within a levee or a dike and is continuously adjustable between a high and a low water level. The penstock has an erosion-resistant flow channel which is embedded and buried in an earthen levee dike or dam which has leakage prevention and seepage prevention protrusions extending around its outer periphery. In the throat of the flow channel is a pivoted, sealed level-control gate which can be adjusted and latched at any position from a horizontally flat position, permitting unrestricted flow through the channel, to a vertical position, blocking off flow through the channel. This pivoting gate is provided with edge seals to prevent the leakage of water. Once adjusted, the gate will maintain a constant water depth within the body of water enclosed by the levee while passing overflow over the gate.

Abstract: An apparatus is disclosed for admitting atmospheric air to a bounded volume of air on a downstream side of a crest gate where the bounded volume is defined by the gate and a curtain of water spilling over the gate. The apparatus comprises a plurality of rigid conduits secured to the gate and sized sufficient to have a first opening in communication with atmospheric air and second opening in communication with the bounded volume of air. The rigid conduits are secured to the gate and spaced along the length of the gate to divide the curtain of water flowing over the gate into a plurality of separate water currents. Permitting communication between atmospheric air and the bounded volume of air, the rigid conduits act to abate damaging vibration to the gate caused by the flow of water over the crest of the gate.

Abstract: Dams which basically consist of foundation plinths, secured as necessary, which plinths carry mobile and/or partially mobile dam elements, which can be inclined using lifting or lowering devices. The system also includes a control cabin.

Abstract: An energy-efficient automatic sluice gate for sustaining a fluid level, separating an upstream pool from a downstream pool in an irrigation system and enabling the level of water in one of the pools to be kept constant at a settable value.

Abstract: A radial or taintor gate utilized to control the flow of water to a turbine is provided with an independently movable flap-gate which is operable to control the release of small incremental amounts of water to flow to the turbine as required, such as speed synchronization; the large radial gate can be maintained closed until such time as synchronization of the turbine has been achieved.

Abstract: Rotating flow control flap-gate in a water canal provides a rotating motion to overcome ice friction without additional ice prevention provisions, to permit water flow in the canal below the ice cover.

Abstract: A variable dam for a water channel having a longitudinal flow axis includes a frame having a bottom member extending across the channel and upright end members. A plurality of approximately planar plates are each connected by a pivot pin at one lower corner to a journal in the bottom member, the plates being in overlapping or staggered relationship with their respective planes approximately normal to the flow axis. The plates are movable by motors effective to rotate at least some of the pivot pins and are assisted in moving simultaneously by a link pivotally connected to each panel near an upper corner thereof. Guys extend to the panels from anchor blocks in the channel either upstream, or downstream, or both.

Abstract: A wave gutter for swimming pools that automatically positions and maintains a longitudinal edge of the gutter, relative to the waterline, for optimum control of waves and other surface disturbances created by persons in the pool includes a wall member, fabricated to be buoyant in water, that is hingedly attached to a sidewall of the pool. The wall member is free to pivot about an axis that is proximate to and parallel with one of a pair of longitudinal edges of the wall member. This freedom, together with the buoyancy of the wall member, allows the other longitudinal edge to be situated substantially at the waterline for the most efficient wave damping capability.

Abstract: The salinity intrusion of ocean tidewater into a communicating fresh water river is prevented by laterally restricting the out-flow cross-section of the river with a series of flotation weirs and control weirs so that the surface level of the out-flow cross-section is higher than the surface level of the adjacent tidal salt water. The weirs are located so as to not obstruct the ship channel of the river.