Which of the following statement regarding Septic tank is true ?
The minimum capacity of a septic tank should be at least 100 gallons A capacity of 20-30 gallons or 2 & half to 5 c.ft. per person is recommended for household septic tanks The length of septic tank is usually equal to its breadth. There should be a minimum air space of 3 cm between level of liquid in the tank & under-surface of the cover