This standard specifies the requirements for materials, design, construction, and testing of precast concrete septic tanks. It covers aspects like capacity calculation, minimum dimensions, inlet and outlet arrangements, and workmanship to ensure the structural integrity and functional performance of the tank for primary sewage treatment.
Specifies requirements for precast concrete septic tanks, including design, materials, and construction.
Quick Reference Values
minimum concrete gradeM20 for RCC parts
minimum freeboard above liquid level300 mm
minimum inlet pipe diameter100 mm
minimum septic tank width750 mm
minimum liquid depth1000 mm
Key Formulas
Tank Capacity = Number of Users * Sewage Flow Rate * Detention Period
Practical Notes
Ensure proper waterproofing coating is applied inside and outside to prevent leakage and groundwater contamination.
The tank must be installed on a firm, leveled base, often a plain concrete layer, to prevent differential settlement.
Verify local pollution control board or municipal guidelines, as they may have stricter requirements than this code for tank sizing and placement.