What is Weir?
A '''weir''' is a barrier built across a [[river]] which changes the flow of the river, usualy for [[irrigation]] and smaller than a [[dam]]. Depending on the design, some pose problems for [[fish]], as the fish cannot get across the weir. ==Gallery== <gallery> File:48 - Mende - Pont Notre-Dame.jpg|A weir in [[Mende, Lozère|Mende]], [[France]] File:Jumping Salmon.jpg|Many fish have the capability to jump over weirs. This shows a [[salmon]] File:Riviere des Prairies spillway in Montreal.jpg|this kind of weir is difficult for fish to climb File:Fischtreppe Inselbad Landsberg.jpg|Weir designed to make it easy for fish to climb </gallery> {{stub}} [[Category:Flood control]]