Environmental Engineering
Scour valves are provided

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

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Environmental Engineering
Sludge volume index is defined as the ratio of

Percentage of suspended solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of suspended solids by weight
Percentage of total solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of total solids by weight

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