The flood prevention device includes a plurality of barrier walls interconnected around a structure or area to be protected. Each barrier wall includes a base sand tube adapted to be filled with sand. At least one gill tube may be stacked atop the sand tube and stitched together to form a wall of desired height. Each gill tube includes a plurality of reinforced gills adapted to permit water flow to fill the gill tube. A hanging tube is operatively disposed above each wall. A pulley mooring system may be disposed on the sides of the structure with one end operatively attached to interlocking poles disposed in the hanging tubes. Opposing sides of each barrier wall include interlocks that may be selectively attached to a locking corner track or a locking extender track to form the overall barrier. Once assembled, the flood prevention device may be lifted or rapidly deployed by the pulley mooring system.