The only difference between a weir and a barrage is of gates, that is the flow in barrage is regulated by gates and that in weirs, by its crest height.
- Barrages are costlier than weirs.
- Weirs and barrages are constructed mostly in plain areas The heading up of water is affected by gates put across the river. The crest level in the barrage (top of solid obstruction) is kept at low level.
- During flood, gates are raised to clear of the high flood level. As a result there is less silting and provide better regulation and control than the weir.
Components of a Barrages | Types of Weirs