According to one embodiment, a flood vent panel includes a plurality of insulation pieces positioned together, and a panel frame surrounding the plurality of insulation pieces. The flood vent panel is configured to be coupled to a frame positionable on a structure, so as to at least partially block a fluid passageway through an opening in the structure. Each of the plurality of insulation pieces is separate from the other insulation pieces of the plurality of insulation pieces. Each of the plurality of insulation pieces is separate from the panel frame.

A portable, water-filled barrier system includes a barrier internally divided into cells that emulates a section of a sandbag dike or wall. Automatic valves can seal openings between the filled cells, so that a punctured cell will not cause cells below and behind to deflate. In embodiments the barrier can be initially filled with air, positioned, and then filled with water while the air escapes through a pressure valve. The system further includes a base with water inflatable front and back panels. The side panels and bottom panel of the base can be water inflatable or flat. The base can be used to increase friction with the ground, protect against stones, and/or to support a leveling wedge or leveling material such as sand or spray foam when located on a sloped surface. A plurality of adjacent bases and barriers can provide an extended barrier system.

An inflatable flood defence structural unit is described for creating an inflatable flood defence arrangement. The unit comprises at least one inflatable chamber comprising a front wall and a rear wall which extend in a substantially parallel orientation. At least one of the front and rear walls provide a water barrier, and a first and second end wall are arranged to couple the front and rear walls together at a respective first and second end of the front and rear walls. The unit further comprises a first inflatable buttress which is rigidly bonded at a proximal end thereof to the rear wall of the chamber, proximate the first end of the chamber and which extends in a direction which is away from the chamber, and a second inflatable buttress which is rigidly bonded at a proximal end thereof to the rear wall of the chamber, proximate the second end of the chamber, and which similarly extends in a direction which is away from the chamber. The unit further comprises a fastening arrangement disposed upon at least one of the first or second buttress for fastening the first and second buttress to a second and first buttress respectively, of a further structural unit to create the flood defence arrangement.

A stand-atone flood barrier apparatus that bolts to the ground through anchor bolts that connects with other stand-alone flood barrier apparatus to make a circuit to protect a person's desired location they wish to protect against flood waters such as crop fields. The stand-alone zigzag sheeting then is protracted from the stand-alone base unit and opened out for the end of sheeting to then fix into the retractable/expandable floor grip which is to be fully extended from the main unit which the zigzag sheeting fixes into. The stand-alone apparatus & zigzag sheeting can be retracted back into the stand-alone main unit and locked for further use in the future. Also can be detached from the anchor bolts and stored or used elsewhere. Underneath the stand-alone main unit there is a spike running through the center to keep away surface water. There is also a soft large rubber strip along the full base of the stand-alone unit to tolerate any undulations in the earth beneath the stand-alone apparatus. The stand-alone can be reused until sufficient use makes it no longer capable of propelling water from the desired locations you wish to protect & recycled.

A portable, water-filled module suitable for use as a barrier or inclusion in a barrier is internally divided into cells and emulates a section of a sandbag dike or wall without requiring sand or intensive labor to install. Automatic valves can seal openings between the filled cells, so that a punctured cell will not cause cells below and behind to deflate. Cells can project below the base into a stabilizing trench. Some embodiments can be initially filled with air, positioned, and then filled with water while the air escapes through a pressure valve. Side structures of the module can enable interlocking with adjacent modules. In embodiments, rigid steps span the module to provide structural support and enable traversing of the module. The steps can be attachable to the module. The light, flexible walls of the module can include nanofiber.