Abstract: The present invention relates to a high water spillway (5) for barrages and similar structures, comprising a spill threshold (6), the crest of which is located at a first predetermined level (RN) lower than a second predetermined level (RM) corresponding to a maximum level or to the highest water level (PHE) for which the barrage (1) is designed, the difference between said first and second levels (RN and RM) corresponding to a maximum predetermined flow of an exceptional high water, and a fusegate (10) plugging the spillway (5), said gate (10) comprising at least one rigid and solid gate element (11), which is placed on the crest (8) and is held in place thereon by gravity, said gate element being imbalanced when the water reaches a third predetermined level (N) higher than the top of the gate element (11), but at most equal to the second predetermined level (RM).

Abstract: A series of self-actuating flood guard units each including a buoyant gate flanked by a pair of the boundary walls and pivotable about a horizontal axis transverse to the flanking boundary walls runs along a shoreline of an adjacent body of water The axis is located at a selected elevation above ground inundated by the body water and is selected to cause the gate to buoyantly rotate upwardly between the boundary walls on rise of water above the selected elevation. The extent of rotation is limited by a restraint acting on the gate. The series of units may be continuous or contiguous and act as a whole to prevent onshore flooding from a rise of the body of water at the shoreline.

Abstract: Retractable screen systems and methods for catch basins are disclosed. In an example embodiment, a retractable screen apparatus includes a retractable center screen coupled to a retracting spring-loaded tube assembly secured to a portion of the catch basin. Two independently-operating side screens may each be coupled to the retractable center screen. Each side screen may be spring loaded such that each side screen is capable of opening and closing horizontally based on a predetermined fluid flow rate of water flowing into the catch basin.

Abstract: Some examples provide methods, systems, devices and/or apparatus related to reducing and/or restricting water from entering underground transportation system, and more Specifically, to reducing and/or restricting water from entering underground transportation systems via vents based on the weight of the water, while not restricting ventilation airflow when water is not present. Some example systems for restricting water flow in a surface vent may include a frame that receives water, a door pivotally coupled to the frame(where the door may pivot between a first position and a second position), and a reservoir pivotally coupled to the door. The reservoir may collect the received water and may cause the door to pivot between the first position and the second position based on weight of the collected water.

Abstract: Methods and systems for use in the removal of trunnion pin sleeves and the supporting of lock and/or dam gate structures (e.g., tainter or roller gates) are disclosed herein. In one example embodiment, a method of trunnion pin sleeve removal includes causing either a constriction of at least one part of the sleeve or an application of a torque with respect to the at least one part of the sleeve, and subsequently applying a force to the at least one part of the sleeve so as to pull out the sleeve. Also, in another example embodiment, a system for supporting a lock and/or dam gate assembly includes a support assembly having a at least one pedestal assembly. The support assembly further includes a trunnion arm support structure, configured to be supported at least in part by the at least one pedestal assembly and to at least partially support a trunnion arm.

Abstract: A gate assembly for use on a pipe, such as a culvert pipe. The assembly having an adjustable engagement band defining an opening. The opening having a nominal diameter sized to engage a culvert pipe. The diameter of the opening being adjustable by up to plus or minus 30 percent the nominal diameter.

Abstract: The disclosure concerns a fusible shutter for a water structure such as a river sill, or a spillway on a dam or on a protective dyke, including a solid element disposed on the top of the structure and held on top by gravity, forming a watertight or substantially watertight wall, installed on the water structure and being able to retract so as to allow water to pass without obstruction when the level of the reservoir or watercourse reaches a predefined level, a chamber being formed at the base of the solid element between the latter and the surface that supports it, pressurization means enabling the chamber to be filled with water in order to create under the solid element a thrust directed upwards when the water in the reservoir or watercourse reaches the predefined level.

Abstract: A flood vent is provided that allows the unimpeded flow of floodwater in a shuttered duct formed in a housing installed in a structure such as a building. A lower region of the duct is angled down between two and eight degrees from a horizontal plane to form a sill that sheds water to an exterior of the structure, and an upper region of the duct is pivotally fixed to a shutter positioned within the duct. The shutter is capable of swinging between a closed position and an open position in response to the presence of floodwater within at least a portion of the duct. Movement of the shutter to, from or through a closed position is hampered by a releasable coupling of the shutter to the sill by a fin.

Abstract: A self-regulating tide gate system for a headwall placed over a channel, stream or river exposed to tides or floods with at least one gate opening formed therein. Disposed on the downstream side of the headwall on opposite sides of the gate opening is at least one pivotally attached door panel designed to swing downstream to allow flow in the downstream direction. When water levels are such that flow in the upstream direction is possible, the door panel is held open thereby allowing some backflow. When the backflow generates a sufficient force, the door panel closes. Attached to each door panel is a guide line. Attached to the guide lines is at least one elastic cord or strap designed to apply a variable tension force to the guide lines to hold the door panels in an open position and progressively resist closure of the door panels when the draft force generated by the upstream flow of water matches or exceeds the tension in the guide lines.

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 present invention comprises a sewer water gate to be located at the opening to a subsurface catch basin of a storm drain system that will exclude trash and debris from the system while still permitting a flow of water, but which will partially open to allow full access for water and entrained material when the rate of flow is sufficiently high while still obstructing the flow of heavier materials.

Abstract: A liquid barrier system automatically deploys when a predetermined liquid level is attained, thereby preventing water or other liquid from entering a structure through an accessway, and automatically retracts when the liquid level recedes. The liquid barrier system includes a float housing assembly installed substantially below grade and adjacent an accessway to a structure. The system also includes a float assembly having a float which is positionable within a float housing relative to a liquid level in the housing. A barrier assembly includes a barrier interconnected to the float, and one or more seal members disposed along a periphery of an accessway. In a high water event, the float rises with the liquid level in the float housing thus causing the barrier to automatically deploy into a sealing engagement with the seal member(s) along the periphery of the accessway, thereby preventing the entry of fluid into the structure.

Abstract: A gate system for an opening through which fluid flows, such as the opening to a storm drain typically found in the curb of an urban street. The system is biased to a closed condition to keep trash out of the drain during dry and low fluid flow situations, then automatically converts to an open condition during heavy fluid flow situations, and then returns to a closed condition when the heavy fluid flow condition abates. The system has a gate portion that rotates between an open position and a closed position adjacent the opening, being biased to the closed position, and a trip plate, which is also biased to a closed position.

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: An irrigation gate system installed in a channel (such as a ditch or canal) for controlling the flow of water through the channel maintaining a desired level of water upstream from the irrigation gate system or for controlling water flow downstream from the irrigation gate system. The irrigation gate system includes a gate which is maintained in a closed position for preventing water flow past the gate or alternatively, in one of a plurality of open positions for allowing desired amounts of water in the channel to flow past the gate. The gate is vertically hingedly connected to a pipe shaft supported by a frame installed in the channel. A gate actuator moves the gate between its various positions upon receiving signals from an electronic programmable controller which in turn may receive signals from a variety of sources.

Abstract: A device installed at a ditch on a road for preventing a backflow of sewage and a malodor is provided. The device includes a frame portion comprising a plurality of frames arranged in parallel with each other, a valve portion being opened or closed in a manner of a lever according to the weight of a flow of the sewage, and a cover portion for covering the frame portion and the valve portion. The cover portion includes flat drain holes formed in plural lines which are arranged in parallel with each other; flow velocity resistance embossings protruding upwardly with a predetermined height in a bar shape; inclined drain holes formed at both ends of the lengthwise direction and inclined upwardly; and a plurality of sliding prevention embossings protruding upwardly from an upper surface of the cover portion, for preventing walkers from sliding thereon.

Abstract: A tidal gate system for a regulating the flow of tidal waters between a first side and a second side of a main opening. The tidal gate system comprises a primary door member defining a regulated opening, a secondary door member sized and dimensioned to cover the regulated opening, a door float, and a regulation float Gravity biases the primary and secondary door members into their closed positions. The door float causes the secondary door assembly to move out of its closed position when a primary water level on the first side of the main opening exceeds a predetermined regulated opening level. The regulation float is operatively connected to the secondary door assembly such that the regulation float forces the secondary door assembly into its closed position when the primary water level exceeds a predetermined regulation float level.

Abstract: A fluid level control system, particularly useful for controlling the level of water flowing in an open channel. The fluid level control system includes a gate having a flap portion interconnected to a lever portion. The flap portion is rotatable about a first pivot point. The system further includes a frame which is fixed with respect to the flap portion. A linkage interconnects the flap portion and the lever portion, and is connected to the frame at a second pivot point different than the first pivot point. Under changing flow conditions in the channel, the present system operates by both: (i) absolute movement of the lever portion and the flap portion, and (ii) relative movement between the lever portion and the flap portion. A fluid treatment system and a method for controlling the level of a flowing fluid may also use such a fluid level control system.

Abstract: A fluid level control system, particularly useful for controlling the level of water flowing in an open channel. The fluid level control system includes a gate having a flap port on interconnected to a lever portion. The flap portion is rotatable about a first pivot point. The system further includes a frame which is fixed with respect to the flap portion. A linkage interconnects the flap portion and the lever portion, and is connected to the frame at a second pivot point different than the first pivot point. Under changing flow conditions in the channel, the present system operates by both: (i) absolute movement of the lever portion and the flap portion, and (ii) relative movement between the lever portion and the flap portion. A fluid treatment system and a method for controlling the level of a flowing fluid may also use such a fluid level control system.

Abstract: A horizontally pivoted structurally rigid buoyant flood gate, in a housing for the gate arranged in front of an opening to a construction, is pivotally floated out of the housing by rising water entering a portal to the housing, and rotates buoyantly upward toward the opening, rising between two side walls longitudinal to the opening and separated from each other by little more than the side-to-side distance of the gate, allowing little water through any gap separating the gate from the side walls, which preferably is sealed by a compression seal, the hydrostatic pressure of water dammed behind the rising gate urging completed closure of the gate through at least the upper half of the closing arc, pressing the gate sealingly against the jambs.

Abstract: A floating debris removal system has a bypass or overflow grate that is hinged at the top and positioned to swing downstream under certain conditions. The grate is fastened with a shear ring that will break when sufficient force is generated against the grate by the flow of overflow water and debris through the system. A plow-shaped member pivots off upwardly as flow increases. The member has a plow-shaped blade that spreads the flow across the inlet of the trap of the system to reduce the velocity of the flow. The shape and weight of the blade are selected for optimal function under a range of water levels and flow velocities, and can be altered to perform best for different installations. Debris pits are provided before or after the traps of the system to collect small suspended debris that is not removed by the traps. The pits are sized and configured to slow the velocity of the flow of that the suspended debris settles into the pits.

Abstract: The invention concerns a protective element (1) comprising a plate (2) with a first longitudinal edge (3) and a second longitudinal edge (4) spaced by a distance (D) from each other, and a pivot bearing (5, 5′) arranged substantially parallel to the first longitudinal edge and/or the second longitudinal edge, designed for transferring forces, whereby the plate (2) is arranged mobile on a substructure (6) to absorb the forces exerted on the protective element, in particular on a protection system against floods and avalanches, and capable of being arranged mobile relative to said substructure (6), in a pivot zone (S).

Abstract: A flood gate for use in a foundation crawl space and the like comprises a frame having side walls defining a fluid passageway therethrough, a door pivotally mounted in the frame for bidirectional rotation between two open positions and a closed position therebetween to permit tidal water flow therethrough, and at least one catching assembly for holding the door in the closed position against a minimum level of pressure of the tidal water flow. Tidal flood waters exceeding the minimum pressure level are automatically vented through the crawl space and the like reducing a risk of structural damage from the tidal flood waters. The flood gate can further comprise a door having a ventilation opening, an automatic louver assembly for controlling air flow through the opening, and a screen covering the opening. The automatic louver assembly opens and closes responsive to ambient temperature.

Abstract: A water control gate assembly comprises a self-actuating top-hung gate for controlling the flow of water in a waterway. The gate is pivotably mounted on a pair of piers located above an upstream of the gate for allowing the gate to pivot between a closed position and an open position in which water flows beneath the gate. The gate includes a ballast tank having an upstream inlet for charging the ballast tank and a downstream outlet for discharging the ballast tank. The upstream inlet is arranged to start charging the ballast tank with water in the event of the upstream water level reaching a first lower level. The downstream outlet is arranged to start discharging the ballast tank in the event of the upstream water level reaching a second upper level, with the ingress of water into the ballast tank between the first and second levels progressively increasing the closing moment of the gate and maintaining it closed against the progressively increasing opening moment of upstream water pressure against the gate.

Abstract: A flood gate for use in a foundation crawl space and the like comprises a frame having side walls defining a fluid passageway therethrough, a door pivotally mounted in the frame for bidirectional rotation between two open positions and a closed position therebetween to permit tidal water flow therethrough, and at least one catching assembly for holding the door in the closed position against a minimum level of pressure of the tidal water flow. Tidal flood waters exceeding the minimum pressure level are automatically vented through the crawl space and the like reducing a risk of structural damage from the tidal flood waters. The flood gate can further comprise a door having a ventilation opening, an automatic louver assembly for controlling air flow through the opening, and a screen covering the opening. The automatic louver assembly opens and closes responsive to ambient temperature.

Abstract: This device for triggering the destruction of a selected portion (1 or 11) of a hydraulic structure such as an embankment dam, dike, or levee built out of erodible material so as to be destroyable by hydraulic erosion is constituted by at least one massive element (5) which is disposed on the top of the selected portion (1, 11) of the structure and which is held there by gravity, the massive element (5) being dimensioned in size and in weight in such a manner as to be expelled by the water when it reaches a predefined level (N), the vertical dimension of the massive element measured beneath said predefined level (N) being selected in such a manner that the nappe which is released after the massive element has been expelled is of a thickness (z) suitable for causing reliable and rapid destruction of the selected portion (1, 11) of the hydraulic structure.

Abstract: A device with a gate release door and other water release openings to attach to the mouth of outlet pipes of flood control structures and similar reservoirs to control the storage and release of water, comprising a gate release door in initial closed position permitting the reservoir to rise during rainfall, above the intake of the stand tower or stand pipe in the reservoir. A float control switch mounted at a predetermined height above the surface of the reservoir, closes as the rising water reaches this maximum level, activating an electric winch, opening the gate release door, permitting the reservoir to return to normal pool level, and continue to serve the primary function of flood control. A pressure control switch mounted on the device, responding to the increasing hydrostatic pressure, provides a dual means to open the gate release door by activating a parallel circuit to the electric winch.

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 invention is directed to a breakaway prop for a wicket employing a slble and rotatable prop bearing which is secured to the prop by shear pins. Upon application of sufficient force, the shear pins release the prop bearing and allow the wicket to drop without damaging the prop.

Abstract: A collapsible safety prop for supporting a waterway dam gate comprising first and second links, each of which has a longitudinal axis and an inner and outer end. The inner ends of the links are provided with a lateral member extending laterally from the longitudinal axis of the links. Each of the lateral members further includes a pivot substantially offset from the longitudinal axis of the links. A pivot pin connects each of the pivots and thereby interconnects the two links. Shear engaging mechanism are provided on the inner ends of the links and positioned on the longitudinal axis of the links and spaced a substantial distance from the pivot pin. Shear mechanism for connecting the shear engaging means are provided and positioned on the inner ends of the links for normally locking the prop links against pivotal movement. The outer ends of each of the links are also provided with pivot mechanism.

Abstract: For the purpose of providing a more economical alternative to conventional control gates for the quasi-permanent closure of all or part of the length of the overflow spillway of a dam except when discharging extraordinary floods, the invention consists of installing on the sill of the spillway a water level raising means comprising at least one heavy element, held by gravity on the sill, the water level raising means or its element being designed to overturn at a predetermined head corresponding to a headwater level not higher than the predetermined maximum water level in order to discharge extraordinary floods, smaller floods being discharged by a separate flood discharge structure.

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: For the purpose of effecting a quasi-permanent raising of the normal water level of an impounded reservoir and thereby augmenting its storage capacity except during the passage of major floods, the invention consists of rigidly fixing to the sill of the spillway a water level raising means comprising at least one vertical plate capable of resisting the water loads when spilling moderate heads (for discharging the floods of shorter recurrence intervals) but bending at its lower portion where it is fixed to the sill at a predetermined head not higher than the maximum water level in order to discharge larger floods.

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: 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: A gate for an irrigation ditch includes a rectangular frame, in which a pair of gates are pivotally mounted on shafts for rotation around vertical axes at the sides of the frame; helical springs connected to the top ends of the shafts and to the frame for regulating the water pressure required to open the gates; and tensioning elements for changing the length and consequently the tension of the springs, so that the pressure required to open the gates can be adjusted.

Abstract: An animal guard for use in a field pipe has a generally circular baffle member formed of relatively thin sheet material mounted for pivotable movement in the direction of effluent flow at a perimetral point inwardly of the pipe at an axial predetermined distance from the open end of the pipe. A stop bar is secured inwardly of the pipe at a distance greater than said predetermined distance so that it is on the opposite axial side of the member. The bar extends from the inner surface of the pipe in a direction inclined in the direction of effluent flow and has a length to restrict pivoting of the member in a second arcuate direction oppositely of the first direction to prevent animal entry past the member while the member is free to pivot in the first direction toward the open pipe end to provide substantially free-flow of debris carrying effluents in the pipe toward the open end, while preventing the entrance of animals into the pipe.

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.