Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
All listed here
Must flow under gravity ½ to ¾ full
Must be of adequate size to avoid over flow

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Waste Water Engineering
In septic tanks,

All listed here
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
Free board of 0.3 m may be provided

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