Cal. Water Code § 8151

As used in this chapter, “date of transfer” means (a) the date of the resolution of the governing body of a flood control district accepting any drainage improvement transferred to it by a county as provided in Article 2 of this chapter, and (b) the date of the resolution, order, or ordinance of the legislative body of any city transferring and conveying any drainage improvement to the flood control district pursuant to Article 3 of this chapter.