Abstract: A double-wall flood barrier to hold back water from either of two opposite sides is provided and includes a first flood wall to hold back water from a first wet side and a second, identical, flood wall parallel and adjacent to the first flood wall with a mirror-image orientation to hold back water from a second wet side. Each flood wall includes a post defining a pair of vertical troughs and a plurality of stop logs stacked horizontally and extending from a trough of a post to a trough of another post or to a channel in an end wall. Each post is removably secured to an anchor plate inset in the floor. A brace may extend outwardly and downwardly from the post to provide support against lateral forces caused by flood water. An anchor link may interconnect adjacent posts of the first flood wall and the second flood wall.

Abstract: A system, method and collar for augmenting a floodwall are disclosed herein. The collar includes metal shell conformed in the shape of bollard, and is slideable over the bollard. The collar is capable of being locked to the bollard by a bolt. The collar is welded or attached to a post of the floodwall. The floodwall may be a removable floodwall installation.