What is the difference between headworks and barrage?

A Barrage is a diversion headworks it's main aim is to divert the flow of river it does not have a storage reservoir on its upstream side. The water is elevated only to few feet. A Dam on the other hand is a storage headwork so the main aim of dam is to create a storage reservoir on the upstream of the dam.

In this regard, what is the difference between Weir and a barrage?

A barrage is a weir that has adjustable gates installed over top of it, to allow different water surface heights at different times. The water level is adjusted by operating the adjustable gates. A dam is a high impervious barrier constructed across a river valley to form a deep storage reservoir.

What was the purpose of barrage balloons?

A barrage balloon is a large kite balloon used to defend against aircraft attack by raising aloft cables which pose a collision risk, making the attacker's approach more difficult. Barrage balloons are not practical against very high-flying aircraft, due to the weight of the long cable required.

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