Waste Water Engineering
The sewers

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

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

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

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