Section 95(15) in West Bengal Municipal (Building) Rules, 2007
(15)"drain" includes a sewer, pipe, ditch, channel, and any other device for carrying off sewage, offensive matter, polluted water, sullage, waste water, rain water of sub-soil water, sealed sewage mains and special machinery or apparatus for raising, collecting, expelling or removing sewage or offensive matter to the sewage outfall;
