Section 79 in Cuttack Development Authority (Planning and Building Standards) Regulations, 2001
79.
(1)Septic tank shall be designed as per Indian Standard Code of Practice.(2)Septic tank may be constructed of brick work, stone masonry, concrete or other suitable materials as approved by the authority.(3)Under no circumstances effluent from a septic tank shall be allowed into an open channel, drain or body of water without adequate treatment.(4)Minimum internal diameter of pipe shall be 100 millimetres. Further at junctions of pipes in manholes, direction of flow from a branch connection shall not make an angle exceeding 450 with the direction of flow in the main pipe.(5)The gradients of land drains, under drainage as well as the bottom of dispersion trenches and soak ways should be between 1:300 and 1:400.(6)Every septic tank shall be provided with a ventilating pipe of at least 50 millimetres diameter. The top of the pipe shall be provided with a suitable cage of mosquito-proof wire mesh.(7)The ventilating pipe shall extend to a height which would cause no smell nuisance to any building in the area, Generally, the ventilating pipe may extend to a height of about 2 metres when the septic tank is at least 15 metres away from the nearest building and to a minimum height of two metres above the top of the building when it is located closer than 15 metres.(8)When the disposal of septic tank effluent is through a seepage pit, it may be of any suitable shape with a minimum cross sectional dimension of 90 centimetres and not less than 100 centimetres in depth below the invert level of inlet pipe. The pit may be lined with stone, brick or concrete blocks with dry open join which should be finished with mortar. In the case of pits of large dimensions, the top portion may be narrowed to reduce the size of the reinforcement concrete cover slabs. Where no lining is used, especially near trees, the entire pit should be filled with loose stones. A masonry ring may be constructed at the top of the pit to prevent damage by flooding of the pit by surface runoff. The inlet pipe may be taken down to a depth of 90 centimetres from the top as an anti-mosquito measure.(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.
