California Code, Water Code - WAT § 75883

(a) The petitioners include a majority of the holders of title or evidence of title of such portion, or of each of such portions, of the tract, representing also at least one-half the area of such portion, or of each of such portions;  or

(b) Within 60 days from the time such determination is made, there is filed with the board the consent in writing, acknowledged or proved as required in Section 75861, of a majority of the holders of title or evidence of title of such portion, or of each of such portions, of the tract of land, representing also at least one-half of the area of such portion or each of such portions.