California Code, Water Code - WAT § 8600.5

(a) The governing body of a public entity that is authorized by law to construct, manage, maintain, or repair levees, channels, or other flood control works that are under the jurisdiction of the board may adopt standards for the operation and maintenance of those flood control works that are more protective of public safety than the standards adopted by the board pursuant to Section 8608, including, but not limited to, standards that are more restrictive of encroachments on levees and adjacent areas.

(b) The standards adopted pursuant to subdivision (a) shall be effective upon approval by the board.

(c) The public entity shall apply the standards adopted pursuant to subdivision (a) prospectively.

(d) The governing body of the public entity may revise the standards adopted pursuant to subdivision (a) subject to the approval of the board. The board may unilaterally revise these standards upon 90 days' written notice to the public entity.