California Code, Water Code - WAT § 79068

(a) “Nonstructural improvements” are projects that are intended to reduce or eliminate susceptibility to flooding by preserving or increasing the flood-carrying capacity of floodways, and include such measures as levees, setback levees, floodproofing structures, and zoning, designating, or acquiring flood prone areas.

(b) “Structural improvements” are projects that are intended to modify flood patterns and rely primarily on constructed components, and include such measures as levees, floodwalls, and improved channels.

(c) “Subaccount” means the Yuba Feather Flood Protection Subaccount created by Section 79068.2.