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State of Haryana - Section
Section 37 in Haryana Municipal Drainage and Sanitation Bye-laws, 1977
37. Manholes.
- At every change in alignment gradient or diameter of a drain, there shall be a manhole or inspection chamber. Bends and junction in the drain shall be grouped together in a manhole as far as possible. The maximum distance between manholes shall be 30 m. The distance between manhole and gullychamber shall not exceed 6 m.Where the diameter of a drain is increased the crown of the pipes shall be fixed at the same level and the necessary slopes given in the invert of the manhole chamber. In exceptional cases where the required fall is not available, connection may be made up to half the difference in the diameter.Chambers shall be of such size as will allow necessary examination or clearance of drain. The minimum internal size of chamber (between brick faces) shall be as follows -| (a) for depth of 0.8 m. or less | 0.75 x 0. 75 m. |
| (b) for depths between 0.8 m. and 2.1 m. | .. 1.2 x 0.9 m. |
| (c) for depths more than 2.1 m. | rectangular chamber with minimum internal dimensions of 1.1 x0.9 m. |