Waste Water Engineering
The sewers

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

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Waste Water Engineering
In septic tanks,

All listed here
Free board of 0.3 m may be provided
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

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