Waste Water Engineering
In septic tanks,

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

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Waste Water Engineering
The sewer pipes

Should resist the wear and tear caused due to abrasion
Are designed for generating self-cleansing velocities at different discharge
Carry sewage as gravity conduits
All listed here

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