Section 79(9) in Cuttack Development Authority (Planning and Building Standards) Regulations, 2001
(9)When the disposal of septic tank effluent is through a dispersion trench, it shall be 50 to 100 centimetres deep and 30 to 100 centimetres wide excavated to a slight gradient and shall be provided with 15 to 25 centimetres of washed gravel or crushed stones. Open joined pipes placed inside the trench shall be made of unglazed earthen ware clay or concrete and shall have minimum internal diameter of 75 to 100 millimetre. Each dispersion trench shall not be longer than 30 metres and trench shall not be placed closer than 1.8 metres.
