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

The depth of tank is kept equal to its width
The minimum width of septic level is 90 cm
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

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Waste Water Engineering
In case of sewer lines

Water test is carried out to check water tightness of the joints
Test for straightness is carried out with the help of a lamp and mirror
All listed here
Obstruction test is carried out with the help of smooth ball of diameter 13 mm

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