Section 3(4)(c) in Tamil Nadu Farmers' Management of Irrigation Systems Rules, 2002
(c)Such delineated area may have a branch canal, or a major distributory divided into suitable reaches based on hydraulic boundary one or more distributaries or direct sluices or a combination thereof serving its command. It shall also have a distinctly demarcated boundary which could be a drain, or a bund or an uncommandable land.