Section 9(2)(i) in The U.P. Area Development (Regulation of Water Supply) (Osrabandi) Rules, 1979
(i)Thok No. I shall be that which has a field nearest to the head of the main 'Gul' and on its left side (if there is any chak road adjoining the main gul, the chak road and the gul combined shall be considered to be the main gul).