Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

The depth of tank is kept equal to its width
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
The minimum width of septic level is 90 cm

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

Sedimentation tanks with high rate trickling filters
A plant consisting of Imhoff tanks with low rate trickling filters
A sedimentation tank and an activated sludge treatment plant
None of these

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