Section 2(1)(h) in Andhra Pradesh Farmers Management of Irrigation Systems Act, 1997
(h)"drainage system" in relation to an irrigation system includes, -(i)channels either natural or artificial, for the discharge of waste or surplus water and all works connected therewith or ancillary thereto;(ii)escape channels from an irrigation or distribution system and other works connected therewith, but does not include works for removal of sewage;(iii)all collecting drains and main drains to drain off surplus water from field drains; and(iv)all field drains and related structures under pipe outlets.