Waste Water Engineering
Maximum permissible velocity 1.5 m/sec, is adopted in drains

Neither A. nor B.
With beds of rocks and gravels
Both A. and B.
Lined with stones

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

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
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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