Abstract: A floating flap gate to prevent water from overflowing into underground spaces, with ease in raising or lowering the door body when water level changes. The floating flap gate comprises a door body with a forward end which swings upwards or downwards in a same direction following a rise or a drop in water level, wherein an opposite end serves as a fulcrum. A rod is attached to the forward end of the door body. One end of a wire rope is attached to the rod, and the other end is attached to a counterweight via fixed pulleys. The fixed pulleys are arranged so that the counterweight is at its lowest point when the angle of inclination of the door body with respect to a horizontal plane reaches within a range from 10° to 80° during raising or lowering of the door body.

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: The floating weir is a device for regulating or maintaining continuous flow from the surface level of a liquid body. As designed, the device provides a continuous, uninterrupted weir edge for controlling liquid flow. The device is particularly suited for skimming applications such as the removal or separation of surface debris, films, scum or secondary liquids of lesser density from a primary liquid body. The unit can be mounted as a fixed installation, such as a connection to a standpipe or, when mounted on a floating platform, as a mobile floating unit. The unit utilizes a float supported weir that is unattached to the apparatus, except for contact with an adjustable retainer, which sets the weir elevation and flow rate. The floating weir is mounted within a close fitting guide collar which guides weir movement and provides, in effect, a liquid seal between these members. The liquid seal also provides a lubricating film to insure free vertical weir movement.

Abstract: An apparatus for automatically and selectively discharging saline water at a tide-preventing floodgate between the ocean and a river or like which comprises a tide-preventing floodgate provided between the ocean and a river or the like, a drainpipe for discharging saline water distributed in a lower portion of said river or the like and disposed on the utmost lower part of said floodgate, a distal end mouth opened at an end portion of said drainpipe to upright direction, a hollow float positioned at the distal end mouth of the drainpipe and supported by at least one support pole for guiding the ascending or descending motion of the hollow float, a communication path provided at a submarine level portion of said floodgate and a flexible communication pipe for communicating the inside of the hollow float with the sea water of downstream through said communication path, whereby said hollow float automatically ascends or descends so as to open or close said end mouth of the drainpipe with respect to a level diffe