Environmental Engineering
The process in which the chlorination is done beyond the break point is known as

Pre-chlorination
Post chlorination
Super chlorination
Break point chlorination

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Environmental Engineering
Scour valves are provided

At street corners to control the flow of water
At every summit of rising mains
At every depression and dead ends to drain out the waste water that may collect there
At the foot of rising main along the slope to prevent back running of water

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