Cal. Water Code § 12736

The Marin County Flood Control and Water Conservation District, in conjunction with the Department of the Army, shall execute the plans and project referred to in Section 12734 and exercise all powers granted to it in the Marin County Flood Control and Water Conservation Act, and the district may make such modifications and amendments to the plans as may be necessary to execute them for the purposes of Chapters 1 (commencing with Section 12570) and 2 (commencing with Section 12639) of this part.