California Code, Water Code - WAT § 10504.5

(a) The recipient of a release from priority or assignment under this part shall, before making any changes determined by the State Water Resources Control Board to be substantial in the project in furtherance of which the release or assignment was made, submit such changes to the State Water Resources Control Board for its approval. The board shall approve any such change only if it determines that such change will not conflict with the general or coordinated plan or with water quality objectives established pursuant to law. All permits and licenses issued pursuant to applications so released or assigned shall contain terms conditioning such permits and licenses upon compliance with this subdivision.

(b) The holder of applications that have been assigned, or in favor of which a release from priority has been made, shall submit any proposed amendments to such applications to the State Water Resources Control Board. The board shall approve such amendments only if it determines that the amendments will not conflict with the general or coordinated plan or with water quality objectives established pursuant to law. The board shall notify the holder of the application of its approval or disapproval.