Which one of the following statements regarding septic tanks is wrong :

Question:Which one of the following statements regarding septic tanks is wrong :

1.a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided

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

3. the minimum width of septic level is 90 cm

4.the depth of tank is kept equal to its width


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