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

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
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When sewage is fresh
When the diluting water is having flow currents
When diluting water is used for water supply near the point of sewage disposed
When diluting water has high dissolved oxygen content

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