Cal. Code Regs. tit. 23, § 220
Flood plain regulations established by a public agency pursuant to Water Code Section 8411 need be applied only to the designated floodway. Such regulations may take various forms so long as they accomplish the purposes intended by the act. Exemplary, not exclusive, acceptable regulations are the following:
1. Amendment filed 8-20-74; effective thirtieth day thereafter (Register 74, No. 34).