Cal. Wat. Code § 12678.3
The Orange County Flood Control District, the Riverside County Flood Control and Water Conservation District, and the San Bernardino County Flood Control District, in conjunction with the Department of the Army, shall execute the plans and projects referred to in Section 12678.1, may exercise all powers granted to them in the Orange County Flood Control Act (Chapter 723 of the Statutes of 1927), the Riverside County Flood Control and Water Conservation District Act (Chapter 1122 of the Statutes of 1945), and the San Bernardino County Flood Control Act (Chapter 73 of the Statutes of 1939), respectively, and may make modifications and amendments to the plans as may be necessary to execute them for purposes of Chapter 1 (commencing with Section 12570) and this chapter.
Ca. Water Code § 12678.3