California Code, Government Code - GOV § 65300.2

(a) For the purposes of this article, a “200-year flood plain” is an area that has a 1 in 200 chance of flooding in any given year, based on hydrological modeling and other engineering criteria accepted by the Department of Water Resources.

(b) For the purposes of this article, a “levee protection zone” is an area that is protected, as determined by the Central Valley Flood Protection Board or the Department of Water Resources, by a levee that is part of the facilities of the State Plan of Flood Control, as defined under Section 5096.805 of the Public Resources Code.