Section 29(b) in Haryana Municipal Drainage and Sanitation Bye-laws, 1977
(b)be laid with a suitable gradient, and where practicable, in a direct line. The standard gradient shall be 1 in 40 for a 100 mm drain and in 80 for 150 mm drain. The maximum and minimum gradients shall respectively be 1 in 20 and 1 in 80 for a 100 mm drain and 1 in 40 and 1 in 140 respectively for a 150 mm drain ;(ii)a drain shall not be constructed so as to be within or under any building, except in a case where any other situation is impracticable ;(iii)where any such drain or part thereof is constructed within or under any building, such part thereof shall be laid or fixed in a direct line, and where practicable, be provided with adequate means of access ;(iv)where such drain is laid under a wall, it shall be protected at that part which is under the wall by means of a relieving arch, flag stone, iron or any other support which shall not bear in the drain and shall be of sufficient size and strength to prevent any [blockade or damage] [Substituted for the words 'disturbance or other injury' by Haryana Notification No. S.O. 120/H.A. 24/1973/Sections 200 and 214/2007. dated 11.12.2007.] to such drain ;(v)a drain shall not be constructed in such a manner that there shall be within a building any inlet to such drain except such inlet as may be necessary from any sanitary fittings or any sanitary installation connected directly to such drain ;(vi)every branch drain shall join any other drain obliquely in the direction of the flow of that drain and as near as practicable to the invert thereof ; and(vii)every inlet other than a ventilating pipe to such drain shall be properly trapped by a suitable and efficient trap, and such trap shall be formed and fixed so as to be capable of maintaining a water seal of ;-
