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

The depth of tank is kept equal to its width
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

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Waste Water Engineering
Traps

Are used to trap the rats entering sewers
Are water seals which prevent the entry of foul gases
Create symphonic action to increase the quick disposal of sewerage
Dissolve the foul gases

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