Waste Water Engineering
The asbestos cement sewers are

Light in weight
All of these
Not structurally strong to bear large compressive stress
Susceptible to corrosion by sulphuric acid

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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
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The depth of tank is kept equal to its width

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