Abstract: A multi-weir door assembly is coupled to a skimmer body near a front entrance of the skimmer body such that a flow of water received in the front entrance is incident on a front side of the multi-weir door assembly. The multi-weir door assembly comprises multiple weir doors that are rotationally coupled to the skimmer body by at least a first hinge assembly. Each of the weir doors has a respective buoyancy, and at least first and second weir doors of the multiple weir doors have first and second buoyancies that are different from one another such that the flow of water incident on the multi-weir door assembly affects the first and second weir doors differently in terms of an angular degree to which the incident flow of water causes the first and second weir doors to rotate about first and second axes of rotation, respectively.

Abstract: An apparatus is disclosed for phase-shifting signals. In example implementations, the apparatus includes a phase shifter. The phase shifter includes a first port, a second port, a vector modulator coupled to the first port, and a signal phase generator. The signal phase generator includes multiple amplifiers coupled between the vector modulator and the second port. The signal phase generator also includes multiple capacitors that couple the multiple amplifiers together to form a loop. Each respective capacitor of the multiple capacitors is coupled between a respective pair of consecutive amplifiers of the multiple amplifiers to form the loop.

Abstract: The present invention teaches a solenoid-valve actuator that is battery-powered and communicates remotely and wirelessly (e.g., via LoRaWAN) to a gateway that communicates with the internet, thereby enabling a user to remotely control fluid flow through a solenoid valve. The end device interfaces to a range of latching solenoid operated valves, e.g., for the control of water flow in irrigation systems.

Abstract: An air infiltration system for a hydroelectric plant includes a spillway gate and a linearized cone valve coupled to the spillway gate, the linearized cone valve having a pivotable plate assembly. The spillway gate may be a tainter or Stoney gate and the pivotable plate assembly may have a deflection plate. A method of infiltrating air in water released from an impoundment may include: lifting a spillway gate from a resting position proximate a bottom of a spillway; and pivoting a deflection plate coupled to the gate proximate the bottom of the spillway; wherein water flows through an opening disposed between the deflection plate and the gate and is sprayed into an atmosphere to be oxygenated.

Abstract: An optimization and management system using a global linearization approach and mixed integer linear programming to perform the dispatch and to schedule a river system for ten days forward while subject to real world, hourly physical, biological, environmental, and recreational constraints. The optimizer system uses a combination of slack variables and stitching methods to approximate a highly nonlinear optimization problem, thereby generating realtime generation schedules to promote to the management authority.

Abstract: The invention provides a cable drive device (10) including a linear drive member (12), and a cable drum (14) attached to a support bracket (30, 32) adapted to be affixed to a surface. The cable drum (14) has an axle (26) supported by the support bracket (30, 32) to allow rotation of the cable drum (14). The cable drum (14) has a cable (42) affixed at either end of said linear drive member (12) and tautly wrapped around the cable drum (14). The cable drum (14) is located between the ends of the linear drive member (12) to, in use, allow the linear drive member (12) to be guided through the bracket (30, 32) to move the linear drive member (12) longitudinally when the axle (26) is rotated.

Abstract: A valve that switches between open and closed states includes a pivoting body having a reservoir, at least one filling port for filling the reservoir and at least one port for draining the reservoir, and a counterweight. The valve further includes a first conduit separate from the body, connected to the filling port, and having a water intake located at a higher position than the filling port, whether the valve is open or closed.

Abstract: A method and device for operating MIMO air interfaces in mobile communications systems, according to which a radio signal is transmitted by a transmitting device via a MIMO channel comprising a number of m subchannels and is received by a receiving device having n antennas. Different polarizations are assigned to the signals to be transmitted on the subchannels, and the signals are supplied to a common antenna.

Abstract: An automatic trip gate for installation in a gate support structure at a bank of an impounded body of water. The automatic trip gate controls a release of an overflow of water through the gate support structure upon the occurrence of an overflow event. The automatic trip gate includes a plate supported by a hinge assembly that attaches to the support structure. A trough attached to the plate catches and retains overflow water. When the level of overflow water in the trough reaches a tipping level, the plate pivots from a substantially vertical orientation wherein the impounded body of water is maintained behind the plate, to a tipped position wherein the impounded body of water is released o through the gate support. A plunge pool is located below the automatic trip gate that absorbs the energy imparted by the plate when tripped.

Abstract: The flood vent of the invention provides a frame configured for installation in a concrete block foundation wall in place of a single block. The frame includes an angularly oriented window. A gate is pivotally mounted at an upper end thereof within the frame to rest against the window, causing the gate to reside at an angle and be held closed by gravity. A float is mounted to the gate and positioned at rest below the lower edge of the frame to cause the gate to pivot toward an open position when flood water rises to a level approaching the wall opening.

Abstract: An automatically openable and closeable gate system that will find primary use with the street curb opening to a catch basin or vault of a storm drain system, and for other similar openings, the system having a gate which during dry and low-flow water drainage situations will be in a closed position such that items of trash, debris, litter, leaves and the like will be prevented from entering the basin, vault or system, yet in periods of heavy rainfall or other heavy water run-off situations will automatically open to allow free flow of water into the basis or vault to alleviate water accumulation in the adjacent street and other surrounding areas.

Abstract: A saltwater intrusion prevention system for use at an interface between a fresh water body and a saltwater body includes a water recovery subsystem for recovering fresh water from a fresh water body. A retention reservoir in fluid communication with the water recovery subsystem receives and redirects the recovered fresh water. A saltwater intrusion barrier subsystem in fluid communication with the retention reservoir is positioned at an interface of the fresh water body and the saltwater body. The saltwater intrusion barrier subsystem includes a plurality of submerged return discharge ports for vertically ejecting the recovered fresh water for providing a hydraulic mounding zone, and a fine air bubbler header for creating a mixing zone. The hydraulic mounding zone and the mixing zone increase the density of the fresh water for offsetting saltwater from the saltwater body.

Abstract: A saltwater intrusion prevention system for use at an interface between a fresh water body and a saltwater body includes a water recovery subsystem for recovering fresh water from a fresh water body. A retention reservoir in fluid communication with the water recovery subsystem receives and redirects the recovered fresh water. A saltwater intrusion barrier subsystem in fluid communication with the retention reservoir is positioned at an interface of the fresh water body and the saltwater body. The saltwater intrusion barrier subsystem includes a plurality of submerged return discharge ports for vertically ejecting the recovered fresh water for providing a hydraulic mounding zone, and a fine air bubbler header for creating a mixing zone. The hydraulic mounding zone and the mixing zone increase the density of the fresh water for offsetting saltwater from the saltwater body.

Abstract: A spa weir includes a support member forming an opening between a spa body interior and a filter housing interior. Two or more spa doors are located at the opening to control the flow of water through the opening, the spa doors being pivotally connected to one another and one of the spa doors being pivotally connected to the support member.

Abstract: A hurter for use in conjunction with a wicket dam prop at a downstream side f a wicket, the hurter comprising a block having therein on an upper surface thereof a bearing for receiving a free end of the prop, a ramp disposed downstream of the block on a base plate and inclined from the base plate to a top surface of the block and adapted to support the free end of the prop, a first trough wall on a first side of the ramp and the block hingedly connected to the base plate, a cover portion of the first trough wall extending over a first portion of the block, and a second trough wall on a second side of the ramp and the block hingedly connected to the base plate, a cover portion of the second trough wall extending over a second portion of the block, the first and second trough wall cover portions being engageable by the prop as the prop moves up the ramp, to cause the first and second trough walls to pivot away from each other to permit the prop to pass between the cover portions and into the bearing.

Abstract: A sluice gate for controlling the discharge of water through a gateway in a flood irrigation system mounted with stub axles defining a hinge axis upstream of the gateway, and comprising a closure element mounted for swing movement about that axis and able to swing from a lower position wherein it blocks the gateway to an upper position wherein it allows water to flow through the gateway, a chamber integral with the closure element, a filler opening through which water from the upstream side of the gateway may enter the chamber, a drain opening that is larger than the filler opening through which water may drain from the chamber to the downstream side of the gateway, and a battery powered solenoid valve, having an actuator responsive to a radio signal from a remote water sensor, controlling the flow of water from the chamber through the drain opening.

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: A single drum of a flow-through soil remediation plant includes a first zone which is a heating zone. The heating zone is disposed next to an intake end through which a first soil material to be contaminated is introduced into the remediation plant. Heat energy is supplied by a burner unit to the first zone to heat the first soil material to a first decontamination temperature. The first soil material then passes from the heating zone to a second zone which is a mixing zone. A second soil material may be introduced selectively into the mixing zone and mixed with the first soil material. With the first soil material having been heated to the first decontamination temperature in the first zone, heat energy is transferred from the first soil material to the second soil material during the mixing process. The heat transfer raises the heat of the second soil material to a second decontamination temperature.

Abstract: A wicket gate for providing a dam in a navigable waterway is described. A cket gate is connected at one end to an axle which permits rotation of the wicket gate from a horizontal to a vertical position. The axle is supported on first and second carrier bearing, connected to a concrete sill within the navigable waterway. The wicket gate may be raised and lowered by a motor located within a gallery of the concrete sill. The motor is connected via a drive shaft to the axle of the wicket gate. This structure permits movement of the gate without props or other protrusions which could collect and hold debris.

Abstract: A movable dam gate hydraulically driven through a fixed strut to maintain regulate a pool of water upstream of a dam, the present gate structure is placed in series as a plurality of units to form a desired length of movable dam. The dam gates of the invention are operated from within a dry gallery which contains a single hydraulic cylinder and associated electric motor-drive hydraulic pump and oil reservoir for each gate. The dry gallery allows ready inspection and maintenance of the hydraulic equipment and prevents silting of the equipment such as occurs in prior art wet recesses within which hydraulic cylinders and associated apparatus have been previously operated. The present gate and gate system can be operated remotely, thereby providing greater safety and convenience to personnel.

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: There is disclosed a liquid confinement structure to control the depth of water contained by earthen levees in a rice field or the like and to allow excess water to flow through a gate therein to prevent overflow and washout of the levees. The structure includes a horizontally elongated panel of rigid sheet aluminum for placement in a gap in an earthen water containment levee. The panel has a central cutaway portion closed by a rigid gate about eight inches high by about four feet wide articulated by a flexible strip joining the bottom of the gate to the horizontal edge of the cutaway portion. When the gate is tilted downward to permit water flow to lower the level of the water, the water is prevented from flowing around the ends of the gate by flaps forming seals between the edges of the gate and the edges of the opening in the panel.

Abstract: A fully portable flume for a canal or water channel comprising a horizontal sill across the width of said flume; means to raise or lower the sill while maintaining it in a horizontal position; a movable transverse wall connected at its upper edge to the sill's upstream edge, and, at its lower edge, to the channel's floor. Flow measuring means such as a stilling well may be operatively associated with the sill.

Abstract: This invention relates to a sealing device ensuring lateral tightness of a weir gate with respect to the corresponding lock wall, of the type comprising a lip disposed over the whole length of each lateral face of the gate and a rounded rib extending the leading face of said gate, wherein the rounded rib projects transversely beyond the plane of the lock wall, so that its periphery, which takes a circular form, comes into abutment against the lateral face of a cylindrical chamber made in the lock wall. In this way, the displacements of the gate do not affect tightness.

Abstract: A flexible membrane supported on a series of compound leaf springs is mounded on the fixed crest of a dam or waterway to retain fluid at or below a predetermined maximum level. The apparatus is adapted to automatically release fluid which rises above this predetermined maximum level in response to the increase in fluid pressure exerted upon the flexible membrane and compound leaf springs, and to return to its original fluid-retaining position when the fluid pressure has receded.

Abstract: An apparatus for control of a liquid level, especially water level, comprising a partition (10) arranged in a drain channel (24) and having an upper edge (12) which serves as overflow. At its lower or bottom edge (14) opposite the upper overflow edge (12) the partition (10) is supported for swinging (axis of rotation 16) at the bottom of the drain channel (24). Extending obliquely upwardly from the bottom of the drain channel (24), away from the water end (18), the partition (10) is held by a level control means (20).

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: A water control flash gate board uses a torsion spring to bias it in a upright water holding position. When the pressure on the upstream side of the gate board is sufficient to overcome the force of the torsion spring, the gate board will pivot towards a lower water releasing position. A resilient gasket is used along the lower end of the water gate board in order to prevent jamming of the board by debris. A plurality of identically constructed gate board assemblies may be arranged adjacent each other with lap gaskets positioned in between for preventing leakage.

Abstract: The gate system comprises a wicket which is capable of taking up a number of different positions corresponding to predetermined angles of inclination, an operating device comprising a pivotally mounted jack, and a rotatable abutment member carried by the wicket for receiving the end of the operating rod of the jack. The jack is restored to an end position of angular orientation when the operating rod is moved away from the abutment member. This end orientation is close to the orientations of the jack during operation. The operating rod of the jack and the abutment member comprise guiding apparatus for orienting the jack towards the abutment member when the end of the jack-operating rod comes close to the abutment member.

Abstract: A wave-and-tide-pump apparatus and method to provide a continuous flow of water from a large body of water to a small body of water, whereby the wave-and-tidal action of the first larger body of water is funneled into the second smaller body of water by means of a pump which is connected therebetween, the pump apparatus comprising an inlet mouth having a freely pivoted, flap-gate member that opens in the direction of the wave flow or incoming tide, thus allowing water to flow into a receiving reservoir and then pass through a conduit or tunnel which is connected to the second body of water, the water entering at a point opposite the natural inlet/outlet of the second body of water, thereby providing a continuous flow of water through the second body of water and establishing a flushing action.

Abstract: A self-regulating tide gate is installed on a conduit connecting an open body of water with a protected body of water. The tide gate comprises a mounting plate secured to the conduit at its end in the open body of water, the mounting plate defining an opening into the conduit. A door has its upper edge pivotally mounted at the top of the conduit, a door float is mounted to the door on its edge opposite the hinged edge and counterfloats are mounted to counterfloat arms extending from the door across the pivot axis thereof. When the water is below a critical level at which it is desired that the door close, the door float maintains the lower edge of the door on the surface of the water, thereby maintaining the door open and blocking debris from jamming the mouth of the conduit. As the water level rises, it acts on the counterfloat to pivot the door towards its closed position, whereafter the door is caught in the flow of water entering the conduit and rapidly pivoted to its closed position.

Abstract: A barrier device comprising a plurality of gated structures extending between opposite shores of a tidal estuary provides a means of preventing intrusion of heavier, colder sea water with each incoming tide and to then be the means for ejecting large volumes of collected sea water together with mud, sand and sewage pollutants. The eventual effect will be to create a body of fresh water of previously unattainable purity. This purity is renewable with the discharge of any excess water available. During periods of heavy withdrawal from the upstream pool all gates can be locked closed. After danger of flooding has ended the upstream pool can then store a very large volume of fresh water. Flood water is ejected as fast as it flows into the pool. Tidal power can be used to force flood water into the sea.