No such petition shall be filed or heard after the decree has been rendered upon the directors' report upon assessment roll and the number of acres assessed to each owner, and the boundaries of land so assessed to the owner shall be final after the rendering of the decree upon the report on assessment roll, except as provided in § 69-5-305.
Mistake in acres — Correction after decree has been made final
Tenn. Code Ann. § 69-5-404, under Correction of Errors.
Tenn. Code Ann. § 69-5-404