Difference between weir and barrage

This video is about difference between a weir and barrage.There is a great difference b/w weir and barrages. weir and barrages are hydraulic structures..
Weir
1-A weir is simple a barrier that is built across a water channel to raise the water level on the upstream side.
2-We can not change level of water on upstream side according to need.
3-Water flows over crest of weir
4- Weirs are cheap structure
5-No Role in flood control
Barrage
1-Barrage involves adjustable gates installed over a weir .
2-We can maintain different levels at different times according to need.
3-Water flows under the gates.
4- Barrages are costly structure than weirs.
5-Barrages can control flood upto some extent.


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