Abstract: A continuous belt screen assembly and related methods of controlling flow through the continuous belt screen assembly. The continuous belt screen assembly has a base, opposed sides, an inlet and at least one outlet. The assembly, in use, is arranged in a channel having a pair of opposed walls and containing a liquid. A flow restrictor for the continuous belt screen assembly includes a body mountable to a downstream end of the assembly to restrict the liquid flowing out of the at least one outlet. The body defines at least a portion of at least one aperture configured to control a level of the liquid upstream of the body.

Abstract: A dynamically deployable, low visibility pneumatic cofferdam for flood mitigation is disclosed. The cofferdam includes a first planar component, a second planar component, an inflatable hermetic airbag sandwiched therebetween, and connection members attached to the first planar component, a second planar component to form a cofferdam unit. The connection members are adjustable to apply and maintain a desired amount of pressure on the airbag to enable a watertight seal to be formed. The cofferdam units may be sized and designed to sealingly mate adjacent cofferdam units in a variety of configurations to form watertight seals. The cofferdam units may also be sized and designed to attach to seawalls, flood walls, sidewalks, or other infrastructure. When in a deployed state, the height of the cofferdam may be adjusted to a desired height to provide flood mitigation. When in an undeployed state, the cofferdam remains in a substantially flat and unobtrusive position.

Abstract: Described is a blower system. The blower system includes one or more blowers. Each blower has an intake for providing air into an air chamber which houses an impeller. A gate covers each intake. Each gate is movable between a closed position in which it is pulled against the intake and an open position in which the gate is lifted off of the intake. A controller system is included that is operable for causing the gates to move from the closed to the open position when a vehicle is present or approaching and cause the gates to return to the closed position when no vehicle is present or leaving.

Abstract: The present invention relates to a self-raising wave barrier for providing an alleviation of a load due to wave action from a body of water on the side of the wave barrier remote from the body of water. The barrier includes a series of barrier assemblies providing alleviation of the load due to the wave action. Each barrier assembly includes a holder for a wave barrier element which is anchored to a bottom of the body of water or a surface adjacent to the body of water, a wave barrier element arrangeable movably over a path of movement in the holder between a lower rest state and a higher active state, and holding means for holding and/or stopping the wave barrier element in the higher active state.

Abstract: A tank arrangement, duplicate cross-sectional restrictions, side roller block, openable reaction roller, openable bottom seal, reaction axle, openable side seal, gate slot inserting steps and a stress reduction cross-sectional restriction are presented to implement an emerging movement type opening/closing gate equipped with advantageous torsion structure.

Abstract: Embodiments are described for a flood defense system having a barrier portion which is selectively engaged with a frame of an entryway. A seal on the interior barrier portion engages a gasket on the frame to provide a barrier for flood waters entering a structure.

Abstract: A flood barrier shield system for installation in a building opening such as a door frame includes a water impervious panel having a base edge and at least two side edges generally complementary in shape to the base and side edges of the opening into which it is to be installed. Channel shaped seal housings are mounted on the panels adjacent its base and side edges which contain seal bars consisting of a relatively rigid bar having a flexible seal mounted thereon and extending the length of the housing. The seal is located to face the opposing surface of the opening and the bar is connected to the housing by selectively operable devices which move the bar and seal between retracted and extended position for ease of positioning the flood barrier in the opening and then forming a water tight seal along the base and sides of the system.

Abstract: A dynamic fluid flow control structure is provided that allows precise control over fluid flow using a series of two or more orifices, at least one of which may be reconfigured to change its flow characteristics. A flood control system and a flood control process are provided that emulate a preset discharge profile over time. Some versions of the structure, process, and system can be used to provide controlled storm discharge patterns in a developed area that emulate the natural pre-development discharge patterns.

Abstract: Provided is a flood protection system for protecting an area from flooding water, wherein the area includes a trench defined at least along a portion of the boundaries thereof and a at least one depression on the side of the trench facing away from the area to be protected. The system comprising a barrier, configured for being at least partially fitted in the trench; and a float coupled to the barrier and being configured for at least partially is disposed in the depression. The float is configured for rising in response to a rise in the water level inside the depression and about the boundaries of the area. The float is further configured for lifting the barrier out of the trench therewith, thereby blocking the waters from entering the area.

Abstract: Systems, devices, apparatus, and methods of locking and unlocking a door that is slidable by articulating wheels in tracks, over an entry port to a storm water structure. Locking the door can be accomplished by rotating bolts that are attached to cams. Rotating the bolts causes the cams to press the door against the tracks. Sealing strips can be compressed between door edges and the track to prevent water from passing around the door. A vacuum truck can remove water and debris from the vault/structure. Other versions allow doors to move downward to allow water to overflow the door. The door can slide upward so water can flow underneath. A door in door version has a secondary door slide up and down in tracks in a main door.

Abstract: Systems, devices, apparatus, and methods of locking and unlocking a door that is slidable by articulating wheels in tracks, over an entry port to a storm water structure. Locking the door can be accomplished by rotating bolts that are attached to cams. Rotating the bolts causes the cams to press the door against the tracks. Sealing strips can be compressed between door edges and the track to prevent water from passing around the door. A vacuum truck can remove water and debris from the vault/structure. Other versions allow doors to move downward to allow water to overflow the door. The door can slide upward so water can flow underneath. A door in door version has a secondary door slide up and down in tracks in a main door.

Abstract: Systems, devices, apparatus, and methods of locking and unlocking a door that is slidable by articulating wheels in tracks, over an entry port to a storm water structure. Locking the door can be accomplished by rotating bolts that are attached to cams. Rotating the bolts causes the cams to press the door against the tracks. Sealing strips can be compressed between door edges and the track to prevent water from passing around the door. A vacuum truck can remove water and debris from the vault/structure. Other versions allow doors to move downward to allow water to overflow the door. The door can slide upward so water can flow underneath. A door in door version has a secondary door slide up and down in tracks in a main door.

Abstract: Systems, devices, apparatus, and methods of moving a door, over a water conveyances. Locking the door can be by rotating bolt heads attached to cams. Rotating heads causes cams to press the door against tracks. A strip can be compressed between the door and track to prevent flow. Slidable doors can move to allow water overflow. The door can slide so water can flow underneath. A secondary door can slide within an opening in a door. A half panel can have an upper opening located in a wall, to close or allow water flow. A channel can have grooves in sides of an opening, where a door can slide to different heights to close or allow flow.

Abstract: The invention provides an undershot sluice gate (17) to control flow of liquid through an open channel (10). The gate (17) includes a gate leaf (18) adapted to be raised and lowered by a control means (22) to allow flow of liquid along open channel (10). Gate leaf (18) has at least a pair of opposing liquid level sensors (44, 46) on, or in, gate leaf (18) to provide measurement of liquid level upstream and downstream of gate leaf (18). The sensors (44, 46) are located at a predetermined distance from the lowermost edge of gate leaf (18) to allow said measurements without disturbance from the fluid flow profile resulting from movement of liquid beneath the lowermost edge of gate leaf (18).

Abstract: A flood flaps vent for sealing a building crawlspace includes: (a) a vent box portion including open opposite front and rear ends on either end of a vent passageway, the vent box including a top box portion with at least one flap slot adjacent a rear end portion of the vent box, and an opposite bottom box portion; (b) at least one flexible flood flap extending across the open rear end portion, with its upper edge seated in the flap slot, other side flap edges of the flood flap being unattached; and (c) a grate portion over the open front end portion of the vent box; the flood flap occluding the rear end portion of the vent box when it is in an at rest, home position. This simplified abstract is not intended to limit, and should not be interpreted as limiting, the scope of the claims.

Abstract: Systems, devices, apparatus, and methods of locking and unlocking a door that is slidable by articulating wheels in tracks, over an entry port to a storm water structure. Locking the door can be accomplished by rotating bolt heads that are attached to cams. Rotating the heads causes cams to press the door against the tracks. Sealing strips can be compressed between door edges and the track to prevent water from passing around the door. A vacuum truck can remove water and debris from the vault/structure. Other versions allow doors to move downward to allow water to overflow the door. The door can slide upward so water can flow underneath. A door in door version has a secondary door slide up and down in tracks in a main door.

Abstract: Systems, devices, apparatus, and methods of locking and unlocking a door that is slidable through tracks, over an entry port to a storm water type vault or storm water structure. Locking the door in place can be accomplished by rotating upwardly protruding bolt type heads that are fixably attached to cams. Rotating the bolt type heads causes the cams to press the door against one side of the tracks. An elongated sealing strip can be compressed between the door edges and the one side of the track and seal and prevent water from passing about the sides of the door. Alternatively, removable wedges can be used to compress door edges in place. Furthermore, a hinged pressure relief door can be attached over a small opening in the slidable door. Opening the small pressure relief door by an elongated tool allows for water on both sides of the sliding door to equalize.

Abstract: The invention provides an undershot sluice gate (17) to control flow of liquid through an open channel (10). The gate (17) includes a gate leaf (18) adapted to be raised and lowered by a control means (22) to allow flow of liquid along open channel (10). Gate leaf (18) has at least a pair of opposing liquid level sensors (44, 46) on, or in, gate leaf (18) to provide measurement of liquid level upstream and downstream of gate leaf (18). The sensors (44, 46) are located at a predetermined distance from the lowermost edge of gate leaf (18) to allow said measurements without disturbance from the fluid flow profile resulting from movement of liquid beneath the lowermost edge of gate leaf (18).

Abstract: A marine gate includes a gate member submersible in a body of water. At least a first post and a second post support the gate member. The gate member is slidably secured on the first and second posts so that the gate member is movable between first and second locations above and below the waterline. The marine gate includes a winch, a cable extending from the winch to the gate member, and an optic fiber net attached at least to the gate member and extending to the sea floor, thereby establishing an underwater fence. Operation of the winch alters a length of the cable, thereby permitting the gate member to be raised to a closed position and to be lowered to an opened position such that a vessel may pass through the gate when the gate member is in the opened position.

Abstract: A drainage system includes a storm water chamber and riser assembly for gathering and dispensing liquids. The storm water chamber comprises a generally elongated arch shape with an arch top and bottom side walls, thereby defining an enclosure. The riser assembly has two generally parallel base assemblies, which each have an outer wall and an inner wall and a top wall connecting the outer wall and the inner wall. The top wall has a chamber seating area for receiving the base area of the chamber and a retaining element for retaining the base area of a chamber in position in the chamber seating area.

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: Disclosed is an expansion-sealed flood control gate, comprising a water board, a frame structure, two symmetrical constraint tracks, at least one encased expandable sealing tube, and a plurality of adapters. A U-shaped slot is formed between the two symmetrical constraint tracks for plugging in the water board. Each constraint track has a U-shaped expanding compression chamber connecting from one end to the other end to accommodate the tube inside. The adapters are connected with the open ends of the tube and fixed on the constraint tracks at the connected ends. Accordingly, there can be effectively repelled floods that the tube with the characteristics of active filling and uniform packing stress have the higher geometric tolerance, even if the slits between the water board, the constraint tracks and ground emerge the unexpected geometrical change, the encased expandable sealing tubes are ballooned to mend the slits.

Abstract: A self-adjusting barrier incorporates a series of float units restrained between a primary wall, such as a bulkhead, and a secondary wall, such as sheetpile. The secondary wall may be braced to the primary wall. The float units slidably interconnect along adjacent edges to self-adjust along a perimeter, such as a marina or waterfront lot, based on the height of water within the chamber (stilling basin) provided between the two walls. Mechanisms for deterring vandalism and providing increased environmental integrity are also provided for select embodiments. Methods of employing the barrier are also disclosed.

Abstract: It is an object to provide a tide apparatus comprising a storage tank connected to a underground pit for normally storing water of a constant amount, a connecting pipe for connecting between the underground pit and the storage tank, and a seismograph releasing apparatus formed on the connecting pipe for sensing a shake in an earthquake and for releasing the water stored in the storage tank into the underground pit, wherein the tide plate can protrude upward from the soil foundation face by operating the seismograph releasing apparatus in an earthquake to make the water stored in the storage tank flow into the underground pit via the connecting pipe.

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 modular guide frame for use with gates of various thicknesses is assembled from separate side portions. The side portions are provided with hubs, having facets of different widths. The hubs may be coupled with one another to align the facets and provide different gate guide configurations, having various channel widths. An extension plate may be coupled between the side portions to further expand the width of the channel. Elongated sealing members may be secured within the channel to further customize the fit between the guide frame and a gate. The symmetrical nature of the side portions allow them to be manufactured from a single extrusion form, while retaining the ability to be used with one or more differently sized gates.

Abstract: A wave-attenuating system. The wave-attenuating system includes a flexible, resilient barrier member that is disposed in a body of water and oriented to interrupt and dissipate the wave action of oncoming waves. The barrier member desirably is constructed from a substantially neutrally or slightly negatively buoyant material so that the overall depth, length, and/or thickness can be increased as needed for a particular application while adding little deadweight to the system in water. The barrier member can be supported by a flotation device in a floating breakwater, or alternatively, the barrier member can be secured to a stationary structure in a fixed breakwater.

Abstract: The flood vent has an elongated box-shaped frame having a top end, a bottom end including a floor, and opposing sidewalls that define a fluid passageway. The frame has an open front and a track formed in the rear of the frame. A door is slidably mounted in the track so that a normally closed position blocks the fluid passageway. The door is sufficiently buoyant to permit floodwater to float the door in the track and, thus, to automatically vent excess water through the fluid passageway. Installed in a crawl space, basement, or similar structure, the venting action of the flood vent limits hydrostatic pressure buildup against the walls of the structure when floodwaters rise, thus preventing structural damage from occurring.

Abstract: The present invention is directed to the structure of a floatable caisson member and to a segmental floatable bulkhead assembly, formed by assembling a plurality of the floatable caisson members. The present invention also includes a method of fabrication of the floatable caisson member. A segmental floatable bulkhead assembly, formed by assembling a plurality of the floatable caisson members, is employed for dewatering a water passage of a dam.

Abstract: A submersible canal bypass is used to bypass the flow around a distinct section of an earthen canal for lining. The canal bypass is placed within the canal and uses a plurality of pipelines and a plurality of bulkheads assembled from portable modular sections. The headgates on the portable modular sections are so arranged along the bulkhead to divert the flow of water through bypass pipelines so as to isolate a section of the canal during lining activities and return the flow of water to the lined canal after lining.

Abstract: The present invention provides a movable defensive apparatus in which a dedicated source of power for driving a relatively heavy defensive wall and an installation space are not required, whereby entry of a mob, a runaway vehicle, and the like, can be prevented, the entry of rainwater, and the like, can also be prevented to some extent. The movable defensive apparatus includes a defensive wall (2) disposed in the vicinity of a doorway (O•I) of a site (G), such as a house, and an installation in the vicinity of a doorway (O•I), a window or the like, of a building for preventing rainwater and undesirable entry of objects, such as a mob or a runaway vehicle from entering the site (g) or a building. Also described is a piston cylinder unit (20, 20) which is operated by running water for driving the defensive wall (2) from a machine room (M•R) to a predetermined upper position along a guide device (10, 10).

Abstract: A slide gate sealing system including a seal mounting frame disposed between the longitudinal rails and the intermediate and horizontal end frame members of a slide gate frame, a ball seal disposed in the seal mounting frame and having a mounting tail with a mating surface, a seal retainer to control the deformation of the ball seal under pressure, at least one isolation dam on the mating surface of the ball seal, and a ramping mechanism affixed to the interior side of the horizontal end frame member.

Abstract: A submersible canal bypass is used to successively bypass the flow around distinct sections of an earthen canal for lining. The canal bypass is placed within the canal and uses a plurality of pipelines and a plurality of bulkheads assembled from portable modular sections. The headgates on the portable modular sections are so arranged along the bulkhead to divert the flow of water through bypass pipelines so as to isolate a section of the canal during lining activities and return the flow of water to the lined canal after lining.

Abstract: The present invention provides a movable water-protection apparatus capable of driving a water barrier plate manually or automatically when needed. The movable water-protection apparatus includes a water barrier plate (2, 50) for shutting out water, such as seawater, river water, and rainwater, likely to intrude into a basement (G) and a driving device for driving the water barrier plate (2, 50) upward from an underground position along a guide device (10) or a side plate (60). The water barrier plate (2, 50) is disposed in an underground space at an entrance of the basement (G). The driving device has a water pressure type piston/cylinder unit (20) to which service water is supplied.

Abstract: A self-regulating tilting weir comprises a tiltable weir gate over which the water flows, the weir gate being hinged at its lower edge (3) to the base of a support frame (1) and counterbalanced by floats (4) located upstream of the weir gate so that the level of water is raised in response to a fall in the water level upstream of the weir gate and is lowered in response to an increase in the water level upstream of the weir gate, the weir gate being connected to the floats (4) by chains or cables (5) which pass over pulley wheels (6), and devices (7, 8) being provided for effecting vertical movement of the pulley wheels (6) relative to the support frame (1). A self-regulating fishway (FIGS. 9 to 11) is provided alongside the weir.

Abstract: An automatically self-erecting barrier which prevents ingress of flood water into a building. A float is provided which when inactive may serve as a doorstep, and which when active rises with the flood water to extend a barrier across a lower part of a doorway into the building. The barrier is guided at its lateral edge, and vertical channels may be fixed to the building on either side of the doorway. The barrier may be sealed to the channels by inflatable sealing elements.

Abstract: A movable barrier wall system includes a housing assembly 12 that has an interior chamber 32. A barrier member 14 is made of a buoyant material having a selected density. The barrier member 14 floats vertically within the chamber 32 when a liquid is present. The barrier member 14 may be made from a closed cell foam core 34 that is clad with a fiberglass mesh material then the assembly is infused with a resin material. Alternatively, the core 34 may be made from a plurality of elongated rods 38 that are individually clad and reinforced with a shear layer. The individual barrier member modules 15 may be assembled in an end to end relationship with an elongated vertical seal member therebetween. The barrier member 14 may be selectively raised prior to and in anticipation of a flood situation of a nearby body of water by a pump and control system that may be automatically or manually controlled. At least one passive backup system is provided for filling the chamber when the pump or control system fails.

Abstract: A fixable-seal sluice gate has a valve vise (18, 19, 25, 26, 31, 32) that forces a sluice-gate valve uniformly and tightly in sealing-surface contact with a domed seal ring (4) that is fixable conveniently and removably intermediate a sluice-gate plate (3) and a sluice-gate wall (1) of a sluice-gate flange that encompasses a valve side of a sluice-gate aperture (2). A plate locator on the valve vice sets the sluice-gate plate in predetermined sealing-contact position for select structure of the fixable-seal sluice gate. The domed seal ring is a plastic material such as Hypalon® having predetermined toughness to resist particle embedment in combination with having predetermined softness for select uses and objectives. A dome flange (5, 6) on one or both sides of a base of the domed seal ring is bracketed removably to optionally the sluice-gate wall or the sluice-gate plate for rigid, reliable, long-enduring and yet quick and convenient attachment and detachment of the domed seal ring.

Abstract: A telescoping weir for the controlled drainage of contaminated bodies of water, such as confined disposal facilities (CDF), which selectively releases only the relatively clean water while leaving behind a contaminated portion. The weir includes a foundation that is anchored to the bottom of the body of water and connected with a discharge pipe, a cylindrical telescoping portion connected with the discharge pipe and extending upwardly from the foundation and terminating adjacent to the surface of the body of water, and a set of mechanical jacks for selectively extending and retracting the upper end of the telescoping portion above and below the water surface in order to selectively drain a top layer of clean decant water therefrom.

Abstract: A novel side seal assembly for a slide gate is provided that essentially comprises a seal member having first, second and third mutually spaced sections formed integral with a base section, the first and second sections defining a slide-receiving channel and the second and third sections defining a tapered wedge-receiving channel, said second section being capable of flexing away from said first section toward said third section under a flexing force applied thereto; a tapered wedge member for disposition in said wedge-receiving channel; and attachment means for attaching said seal member and said wedge member to a gate slide guide, said attachment means including fastener means for retaining said wedge member at a selected depth in said wedge-receiving channel, said wedge member acting on said said second and third sections to produce a flexing force that causes said second section to flex toward said first section whereby to cause said first and second sections to engage and form a watertight sliding seal w

Abstract: A paddy field water level regulating device 6 installed between a water pipe buried along a farm road 43 and a farming plot 42, the device consisting of a cylindrical feed and drain basin 60 with a closed bottom, having a farming plot feed and drain port 61 communicating with the farming plot 42; a water inflow and drain section located in the geed and drain basin 60 near the bottom thereof and connected to the water pipe; a drain valve located in the water inflow and drain section; and a height-adjustable water level regulating weir 65 located in and water inflow and drain section.

Abstract: A flood gate structure incorporating a safety device thereon to prevent harm through crushing or trapping of animals, such as manatees by the flood gate when passing into its closed position. An object sensor, along with an override sensor assembly, are provided and coupled to the flood gate and are positioned to open or close a circuit associated with the object and override sensor assemblies thereby regulating current flow to a drive motor which is drivingly attached to the flood gate and, upon activation thereof, serves to move the flood gate between its open and closed position.

Abstract: The invention relates to a movable dam for a water-course. This dam comprises a chamber which, for example, is formed in a dike or alike and wherein a buoyant body is housed supporting a vertical retaining wall. At its top the chamber communicates with the surroundings through a slot receiving the vertical retaining wall, whereas further a filling channel connects to said chamber and extends towards the watercourse. It is possible that a discharge channel is connected to the lower part of the chamber. Further sealing means may be provided.

Abstract: A water control and diversion headgate for use in irrigation systems, simplifying the headgate construction, easing its operation and improving its overall efficiency. This headgate includes a corrugated pipe, sometimes provided with an internal liner and having a beveled slot which extends slightly less than halfway through its diameter. A solid, flat elongated water-blocking gate, usually somewhat flexible, is positioned within the slot for vertical movement and for fully or partially blocking water flow through the pipe. The gate has a tapered lower edge and is adapted to make a sealing line contact with an adjacent pipe corrugation for sealing efficiency.

Abstract: A liquid barrier system includes a structure forming a below ground level float-receiving chamber. An inlet passageway for round water or other liquid directs the liquid into the bottom of said chamber to fill the chamber when it is desired that a barrier wall-forming part of the barrier system is to rise above ground level. Where the barrier system is a flood water barrier, the chamber bottom connects with a sewer system so that the chamber does not fill unless flood risk conditions exist, as when sewer back-up occurs. A float structure with which the barrier wall is associated is vertically movable in the chamber from a bottommost position therein when there is no liquid build up therein to an uppermost position when said liquid rises therein where the barrier wall is substantially above ground level. Seals are provided which prevent the liquid from gaining access to said one side of the barrier wall.

Abstract: A water tight seal for water slide gates, and more particularly to a seal which is made from an elastomer such as reinforced plastic. Said seal comprises a first portion and a second portion whereon slides the gate and a resilient means so as to clasp the gate between said first and said second portions of said seal.

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: A water control structure for a flow channel comprises a structure-mounted roller assembly having a pair of elongate, generally U-shaped frame members including an upstream leg, a downstream leg and a connecting web therebetween, the frame members adapted to be positioned on opposite sides of the flow channel with the openings in the U-shape facing each other for slidably receiving and supporting in vertically stacked relationship the ends of from one to a plurality of plain flashboards therewithin for providing a height-adjustable gate of flashboards for regulating water levels. A plurality of longitudinally spaced-apart rollers are mounted on the downstream leg for facilitating longitudinal sliding movement of the flashboards in the U-shaped members, each of the rollers comprising a split wheel roller assembly including first and second spaced apart, major diameter roller surfaces.

Abstract: The invention comprises a mobile backfilling machine wherein raw materials located adjacent an excavated trench are picked up, graded and delivered to the open trench in an order of size grading from finest to coarsest, thereby providing a fine material padding for a product which has been placed into the trench. The machine may also be used to place a warning ribbon into the trench at a point above the padding.

Abstract: A pumping system for gates wherein a sluice body liftably received in the guide grooves formed in the side walls of a water channel mounts a plurality of pumps in parallel with each other, the suction ports and the discharge ports of the pumps being located in the upstream and downstream sides, and a debris collecting device is provided in the water channel upstream the pumps. The suction ports of the pumps are opened towards the bottom of the water channel at a given height, and the debris collecting device is so constructed that it can be liftable over the level of the water channel. At the time of a natural drainage, the sluice body and the debris collection device are lifted to allow free flow of the water through the water channel, while at the time of a forced drainage the sluice body and the debris collecting device are lowered so that debris, etc.