A wall element for holding back water is formed in one piece and has a planar, rectangular main portion having a first side, a second side parallel to the first side, a third side perpendicular to the first side, and a fourth side parallel to the third side. A first planar bearing portion is connected to the main portion over the first side and perpendicular to the main portion. A second planar bearing portion is connected to the main portion over the second side and perpendicular to the main portion. The second bearing portion is opposite the first bearing portion. The wall element has a planar connecting portion connected to the main portion over the third side and inclined to the main portion. The connecting portion has connecting holes in the longitudinal direction, and the main portion has connecting holes along the longitudinal extent of the fourth side.

Described herein is a floating flap gate including a gate leaf having a buoyancy forming portion, the gate leaf being configured to be raised due to buoyancy effect (e.g., from water), a bottom fitting mounted to a proximal end portion of the gate leaf, the bottom fitting having a convex circular arc-shaped surface across a width direction of the gate leaf, a plate member having a concave circular arc-shaped surface to be mated with the convex circular arc-shaped surface of the bottom fitting when the gate leaf is in a lowered state, wherein the concave circular arc-shaped surface is in contact with the convex circular arc-shaped surface when the gate leaf is raised.

A pressure-tight door allowing movement of hinges includes: a hinge fixating part including a fixed member having one surface with a movable groove formed therein and the other surface fixed to a door frame, and a movable member having one surface inserted into the movable groove so as to slide bidirectionally on the movable groove and a hinge attached to the other surface of the movable member, connected to a door and sliding together with the movable member. The movable member of the hinge fixating part slides inwardly together with the hinge only when the pressure due to flooding or explosion is applied to the pressure-tight door, whereby the pressure-tight door is able to effectively block any leakage by compressing the gasket.

Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the ventilation duct includes support sidewalls fitting in the shaft providing a ventilation passage between support top and bottom openings and a suspension member supported on opposed lateral sidewalls proximate the top opening holding one or more hinge connected panels that manually release to rotationally close the passage and are manually rotationally liftable to a home position allowing ventilation. A panel drain automatically closes when the panel is raised to home position so it is already closed when the panel is released to rotationally close the passage.

Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the ventilation duct includes support sidewalls fitting in the shaft providing a ventilation passage between support top and bottom openings and a suspension member supported on opposed lateral sidewalls proximate the top opening holding one or more hinge connected panels that manually release to rotationally close the passage and are manually rotationally liftable to a home position allowing ventilation. A releasable latching system between panel and a suspension member holder catches rising panels to hold them in home position ready for release.

Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the underground ventilation duct includes support sidewalls fitting in the shaft providing a ventilation passage between support top and bottom openings and a suspension member supported on opposed lateral sidewalls unobstructively horizontally spanning the passage proximate the top opening and holding one or more hinge connected panels in the passage that manually release to rotationally close the passage and prevent flooding and are manually rotationally liftable to a home position allowing ventilation. The suspension member is liftingly removable from the support and may include end keys received in keyed supports to allow the suspension member to fit in the supports so a specific panel closes to a specific sidewall.

Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the underground ventilation duct includes one or more hinged panels closing a ventilation passage between the top and bottom of a support fitting in the shaft to prevent flooding. The panels have handles on their topside and pivotable arms on their underside and are liftable to an upright home position allowing ventilation, using tools to reach through grating covering openings on the shaft and lift the panel handles and after the panels are partially lifted, using reach tools to engage and lift the arms to press them again support sidewalls to exert lateral force on underside of the panels to complete upward rotation to the home position.

A device prevents flooding under sliding patio doors by blocking the space between a bottom of a sliding door panel and the top of the sliding door track. The device includes a reshapeable base that fills an external portion of a track of the sliding door to prevent water from pooling in the track and then from being driven by wind under the door panel. The shapeable base is made of a heavy material such as a sandbag that prevents the shapeable base from being blown out of the track, even during hurricane force winds. The device further includes a declined portion that directs rainwater away from the outer surface of the door panel, beyond the outer rim of the track. The declined portion thereby prevents rainwater from collecting within the track by directing the rainwater outward, beyond the outer rim of the track. An assembly of a plurality of devices can be utilized to protect a sliding door that has multiple panels, In the case of the assembly, a respective device is provided for each of the door panels in the sliding door.

A hinge assembly for a flood gate comprises support means (1) provided with a first projecting portion (5); a hinge housing (9) having a base plate (11) formed with an aperture (13) for receiving the first projecting portion (5) of the support means (1), with a second projecting portion (21), and with a third projecting portion (15) provided with an aperture (13) receiving a hinge pin. Adjusting means (27, 28) acts between the first and second projecting portions (5,21) and threadingly engages with one thereof. The adjusting means (27,28), the support means (1), and the hinge housing (9) are configured such that rotation of the adjusting means (27,28) in one direction causes movement of the hinge housing (9) relative to the support means (1) in a first direction and such that rotation of the adjusting means (27,28) in the other direction causes movement of the hinge housing (9) relative to the support means (1) in a second direction opposite to the first axial direction. Hinge arm adjusting means (31) is threadingly mounted in the third projecting portion (15) such that rotation of the adjusting means (31) in one direction moves the adjusting means (27,28) in a third direction and rotation of the adjusting means (31) in the other direction moves the adjusting means (31) in a fourth direction opposite to the third direction. The hinge arm adjusting means (31) is adapted in use to engage with a hinge arm (37) so as to raise or lower the height of the hinge arm (37) within the hinge housing (9), the third and fourth directions being perpendicular to the first and second directions.

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 including 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 positions 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.