Abstract: A flood barrier unit having a base and at least one side wall is provided. The walls of the unit are tapered such that it is capable of being stacked vertically with other such units when not in use. The unit preferably includes at least one connection slot on each wall, wherein each connection slot is adapted to sealingly accept a connection piece. A plurality of such units may be connected together to form a watertight flood barrier, where adjacent units are adapted to be connected together in a watertight manner using one connection piece. Additional connection pieces suitable for sealingly engaging a vertical structure such as the wall of a building are also provided.

Abstract: A flood barrier unit having a base and at least one side wall is provided. The walls of the unit are tapered such that it is capable of being stacked vertically with other such units when not in use. The unit preferably includes at least one connection slot on each wall, wherein each connection slot is adapted to sealingly accept a connection piece. A plurality of such units may be connected together to form a watertight flood barrier, where adjacent units are adapted to be connected together in a watertight manner using one connection piece. Additional connection pieces suitable for sealingly engaging a vertical structure such as the wall of a building are also provided.

Abstract: A flood barrier comprises hollow self-filling units (10, 12, 14, 16) placed end-to-end and connected at their ends by downwardly tapered bilobal (46) keys inserted into sockets (26, 28) at the ends of the units, wherein the keys incorporate concrete or other ballast for negative buoyancy.

Abstract: A flood barrier comprises hollow self-filling units (10, 12, 14, 16) placed end-to-end and connected at their ends by downwardly tapered bilobal (46) keys inserted into sockets (26, 28) at the ends of the units, wherein the keys incorporate concrete or other ballast for negative buoyancy.