The department shall develop and submit to the board, for adoption by the board, criteria for the maintenance and improvement of nonproject levees. The criteria shall vary as required to meet specific conditions and shall be multipurpose in nature, and include environmental considerations, when feasible. The criteria shall embody and implement both of the following:
(a) The short-term mitigation plan set forth in the “Flood Hazard Mitigation Plan for the Sacramento-San Joaquin Delta,” prepared by the department for the Office of Emergency Services, dated September 15, 1983, or as amended.
(b) The “Vegetation Management Guidelines for Local Nonproject Delta Levees” dated April 1994, or any successor guidelines.