For the purpose of this article, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   DITCH or DRAIN. Any watercourse or conduit, whether open, covered or enclosed, natural or artificial, by which waters coming or falling upon lands are carried away.
   DRAINAGE STRUCTURES. Those structures other than ditches, drains or pumping plants which are intended to promote or aid drainage. Such structures may be independent from other drainage work or may be part of or incidental to such work. The term includes, but is not restricted to, dams, catchbasins, bulkheads, walls, spillways, flumes, dropboxes, pipe outlets, junction boxes and structures, and the primary purpose of which is to prevent the erosion of soil into a drain.
   PERSON. Any natural person, partnership, trust, unincorporated association, corporation or joint venture.