Waste Water Engineering
Sewer ventilating columns are generally placed at

All listed here
Upper ends of branch sewers
Distances 150 m to 300 m
Every change in the size of sewers

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Waste Water Engineering
In septic tanks,

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

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