Environmental Engineering
Double filtration is used

To increase the filtration rapid sand filters capacity of
To increase the filtration slow sand filters capacity of
All of these
For isolated buildings like pools, hotels etc swimming

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Environmental Engineering
Scour valves are provided

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

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