Environmental Engineering
The settling velocity of a particle in a sedimentation tank increases if

None of these
Particle size is decreased
The surface area of tank is increased
The depth of tank is decreased

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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 every depression and dead ends to drain out the waste water that may collect there
At street corners to control the flow of water

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