(a) Any disaster council previously accredited, the State Civil Defense and Disaster Plan, the State Emergency Resources Management Plan, the State Fire Disaster Plan, the State Law Enforcement Mutual Aid Plan, all previously approved civil defense and disaster plans, all mutual aid agreements, and all other documents and agreements existing as of the effective date of this chapter, shall remain in full force and effect until revised, amended, or revoked in accordance with the provisions of this chapter.
(b) Nothing in this chapter shall be construed to diminish or remove any authority of any city, county, or city and county granted by Section 7 of Article XI of the California Constitution.