Section 53A(2)(i) in The Punjab Land Revenue Act, 1887
(i)a period not exceeding forty years and not shorter than ten years may be fixed for any area, specified by the [State] [Substituted by Adaptation of Laws Order, 1950.] Government, in which canal irrigation has been introduced after the date of the orders passed under the provisions of sub- section (1) of section 51 at the last previous assessment or in which it has been proposed to introduce such irrigation during the period fixed ;