Environmental Engineering
Most suitable section of sewer in separate sewage system is

Modified egg shaped section
Rectangular section
Standard form of egg shaped sewer
Circular section

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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 sludge by volume to percentage of suspended 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

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