California Code, Water Code - WAT § 8757

In determining the benefits that will or may accrue to each particular tract of land by the construction or maintenance of the works contemplated by any project or unit, the works of the project or unit shall be considered as a whole and land shall be assessed for the works embraced in the project or unit only in the proportion that it will or may be benefited by the construction of the entire works embraced in the project or unit.