Section 29 in Haryana Municipal Drainage and Sanitation Bye-laws, 1977
29. Laying out drains.
- (i) Every drain shall-(a)be of a suitable size, and if it is intended for the conveyance of soil water or waste water, shall have an internal diameter of not less than 10.0 mm ;(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 ;-(a)50 mm where such inlet has an internal diameter of less than 80 mm ;(b)75 mm where such inlet has an internal diameter of more than 80 mm ;(viii)every trapped gully shall be covered with a grating the bars of which shall be not more than 10 mm apart ;(ix)have a suitable and efficient intercepting trap, when such trap has been required by the committee by a general or special order, with a water seal at least 100 mm at a point as far as may be practicable from the building and as near as may be practicable to the point at which the drain shall be connected with the sewer, which shall be provided to such a drain before connecting it. Such a trap shall be provided with a raking or leaning arm, fitted with a secure and suitable stopper as a means of access shall be-(a)constructed so as to be water-tight ;(b)fitted with a suitable cover at the level of adjoining ground surface; and(c)if placed within a building fitted with an airtight manhole cover.
