Q. Which one of the following statements regarding septic tanks is wrong? (Solved)
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
- d. The depth of tank is kept equal to its width