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 minimum width of septic level is 90 cm
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
The depth of tank is kept equal to its width

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Waste Water Engineering
The sewers

All listed here
Must be of adequate size to avoid over flow
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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