Water Code § 2801
ARTICLE 11. Proceedings when Appropriation Incomplete at Time of Determination
All persons claiming rights under an incomplete appropriation, when notified as provided in this chapter, shall appear and submit their proofs of claim in accordance with this chapter, or they shall be deemed and held to be in default and to have abandoned or to have no right, title, or interest in or to the water of the stream system, other than as the person may be found to be entitled by the board based on available information and data.