Environmental Engineering
An egg shaped section of sewer

Is more stable than circular section
Is easy to construct
Is economical than circular section
Provides self cleansing velocity at low discharges

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Environmental Engineering
Scour valves are provided

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
At the foot of rising main along the slope to prevent back running of water

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