Water users not present during conduct of the detailed field investigation and those not filing notice of intent shall, insofar as they are known, be supplied a copy of the factual determinations of the representative of the board and a blank form of proof of claim and shall be allowed to file proof of claim after completion of the detailed investigation of their project by the representatives of the board on the same basis as persons who were present and who filed timely notices of intent.
Ca. Water Code § 2555