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

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

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Waste Water Engineering
In septic tanks,

All listed here
The clear space between the baffle top and covering slab is about 7.5 cm
The baffles or tees are extended up to top level of scum
Free board of 0.3 m may be provided

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