flood walls
...that flood walls are man-made vertical barriers that are designed to temporarily contain the waters of a river or other waterway during seasonal or extreme weather events?
...that <b id="mwBjg"><a href="./Flood_wall" id="mwBjk" rel="mw:WikiLink" title="Flood wall">flood walls</a></b> are man-made vertical barriers that are designed to temporarily contain the waters of a <a href="./River" id="mwBjo" rel="mw:WikiLink" title="River">river</a> or other waterway during seasonal or extreme weather events?