Waste Water Engineering
In septic tanks,

The clear space between the baffle top and covering slab is about 7.5 cm
Free board of 0.3 m may be provided
The baffles or tees are extended up to top level of scum
All listed here

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

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

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