California Code, Water Code - WAT § 1205

(a) Following notice and hearing, the board may adopt a declaration that a stream system is fully appropriated. As used in this article, “stream system” includes stream, lake, or other body of water, and tributaries and contributory sources, but does not include an underground water supply other than a subterranean stream following through known and definite channels.

(b) A declaration that a stream system is fully appropriated shall contain a finding that the supply of water in the stream system is being fully applied to beneficial uses where the board finds that previous water rights decisions have determined that no water remains available for appropriation.

(c) Upon its own motion or upon petition of any interested person, and following notice and hearing, the board may revoke or revise a declaration that a stream system is fully appropriated.