Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Scour valve
Sluice valve
Safety valve
Check valve

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Environmental Engineering
Double filtration is used

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

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Environmental Engineering
Sludge volume index is defined as the ratio of

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

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