Section 2(1)(x) in Kerala Municipality Building Rules, 1999
(x)"drain" means a sewer, pipe, ditch, channel and any other device for carrying of sewage, offensive matter, polluted water, sullage, waste water, rain water or sub-soil water and any ejectors, compressed air means, sealed sewage mains and special machinery or apparatus for raising, collecting, expelling or removing sewage or offensive matter to the sewage outfall;