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
Which one of the following statements regarding septic tanks is wrong?

The minimum width of septic level is 90 cm
The depth of tank is kept equal to its width
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided

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