Section 97(1) in The Haryana New Mandi Townships Building Rules, 1967
(1)Every person, who shall construct a subsoil irrigation work for the disposal of the effluent from a septic tank under land, shall cause the subsoil irrigation system thereof to be constructed of open joint earthen-ware pipes not less than 75 milimetres (2.9528') diameter and laid at suitable falls in parallel rows, under the whole area of the said land at intervals not exceeding 2 metres (6.5617 feet) and with a cover not exceeding one metre (3.2808'). He shall cause the pipes to be surrounded with a continuous envelope of clean broken brickbats passed through a mershed screen of 25 millimetres (0.9843 inches) sq. mesh not less than 15 centimetre (5.906 inches) thick all round the pipes.
