A method for mitigating flooding in existing coastal plain areas includes: A dyke (or dykes) is (are) set/built on seabed outside partial existing coastline of an existing coastal plain area to form an enclosed area; the enclosed area, together with the dyke(s), the reservoir inlet(s) and outlet(s), constitutes a reservoir for containing rainwater; or, part(s) of the enclosed area is (are) of a reclamation area (or reclamation areas). Before the start of forecast heavy rainfall or continuous rainfall, the water level in the reservoir is lowered in advance and the water level of water area for containing rainwater in the existing coastal plain is also pre-lowered, so effective storage capacity for containing rainwater against flooding caused by rainfall in the locality is substantially increased. The present invention is applicable for the flooding control works, reclamation works, roads and highways and their integrated works in existing coastal plain areas.

A flood-resistant facility is obtained by constructing a flood-resistant barrier surrounding a plurality of buildings. The area surrounded by the flood-resistant barrier is such that an embankment is created, and the height of the upper end part of the flood-resistant barrier constructed on the embankment is at least the height of the flood depth of that region. By closing off an opening in the flood-resistant barrier during flooding, an isolated space is formed between the buildings and the flood-resistant barrier. A portion of the wall of one or more of the buildings protrudes to outside of the area surrounded by the flood-resistant barrier, and the wall surface of the protruding section is configured to be a water-resistant wall which has watertightness and is continuous with the flood-resistant barrier. Furthermore, the height of the flood-resistant barrier main body can be suppressed in an amount equivalent to the height of the embankment.

A water flow control device is provided that opens to allow water to leave a basin and pour into another pool of water. The water flow control device closes when the level in the pool of water is such that an influx of water could be returned to the basin. The water flow control device has a buoyancy apparatus that opens and closes the water flow control device based upon the level in the pool of water. The water flow control device also has a conveyance channel apparatus that directs water from the basin through the water flow control device in the event the buoyancy apparatus provides an opening to do so.

A flexible and movable splice joint between edge aligned adjacent panels incorporates a flexible water sealing gasket and a flexible tensile member, which may be a strap or a cable or chain that allow the panels to move laterally and rotationally transversely relative to each other without damaging each other by such movements, and is particularly applicable to a plurality of assemblies of so joined panels that form raisable flood barriers to prevent flooding of land and improvements on the land by water rising from an adjacent body of water without permanently blocking a view of the waterscape.

A module for implementing a protective barrier against liquid runoff and/or flooding comprising a retention member adapted to retain a liquid body on a front area located at a front side of the protective barrier, one or more sensors adapted to acquire at least one information about the module or about the liquid body, a relief valve, the relief valve being adapted to be actuated from a closed state to an open state according to the information acquired and provided by the sensor, and related system and method.

The present invention relates to a retractable floodwall unit that comprises a foundation unit having a plurality of guide tracks along side walls of the foundation unit, a floodwall panel stowed in the foundation unit; and a power system for raising and lowering the floodwall panel. The foundation unit includes a first housing unit enclosing an actuator of the power system, and the floodwall panel includes a plurality of guides that mate with the guide tracks of the foundation unit.

A stowable flood barrier system comprising: first and second barrier modules each comprising a frame and a barrier panel pivotable with respect to the frame between a stowed position and a deployed position, in which deployed position a base of the barrier panel is sealed against the frame and a free edge of the barrier panel extends clear of the frame to present a barrier segment between lateral edges of the barrier panel, wherein the first and second barrier modules are sealable together in the deployed position along the lateral edges of their respective barrier panels to form a linked flood barrier.

A permanent below-ground flood barrier installation is characterized by a trench surrounding a specified area. A concrete ballast lines the trench and anchors a covered housing containing a flexible water impermeable fabric wall and a series of supports. When a flood is impending the housing is opened, the supports removed and set up vertically at ground level, and the fabric wall extended upward. The fabric wall is attached at its upper edge to the cover set atop the supports, and at its lower edge to the housing. Three point anchoring of the supports maintain them in vertical orientation and stop means prevent backward movement during storm surges. When flooding subsides the components can be cleaned, dried and returned to the housing. No tools or special skills are required to set up the wall and supports once the initial installation has been completed.

The invention relates to improved water control gates and related inflatable actuators, and associated sealing, manufacture and operation apparatus and methods. Advancements in technologies related to air fitting design, inflated bladder stress relief, inflatable bladder strength enhancement, water gate related slide friction mitigation, abutment and other impounded water seals, gate panel fabrication, traffic accommodating water impoundment structures, and water gate panel system operation efficiency, as well as nappe aeration, hinges, and bladder manufacture technology are disclosed herein.

A walkway for use between a shoreline of a body of water and at least a portion of a building exposed to the body of water, the walkway including: a base adjacent to the building; a plank having a surface for use by pedestrians to walk upon when the plank is in a first position at least indirectly disposed on the base, the plank having a first end rotatably connected to the base and having a second end extending from the first end away from the building along a length of the plank, the surface being exposed for use by the pedestrians to walk upon when the plank is in the first position; and a lifting mechanism operatively connected to the plank to rotate the plank from the first position to a second position where the length of the plank is oriented adjacent to a wall of the building to impede a rising height of the body of water.