Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

Equal to HMD when flowing full
Less than HMD when flowing full
Greater than HMD when flowing full
None of these

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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 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

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