Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Large scale infiltration of storm water
Low estimates of the average and maximum flows
Unexpected increase in population
All listed here

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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 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
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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