A flood barrier unit is provided for a flood barrier system. Each unit has three pillars attached to pillar footings implanted in the surrounding ground surface. For each pillar a concrete brace member footing is provided for the support of brace members compressively positioned between the pillar tops and the brace member footings. A turnbuckle connects two portions of each brace member, and when properly manipulated, will force the brace member ends into holes in the pillar footings and brace member footings. Barrier panels with tongue-and-groove top and bottom edges form a wall when attached to the pillars using a brace plate and bolts. A water-resistant vapor barrier, with a weighted bottom portion, is draped over the top of the barrier panels for fastening between the pillars and panels using a hook-and-loop fastener and the barrier panel bolts. Alternate embodiments include differing arrangements and numbers of the brace members.

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