In an irrigation district containing 500,000 acres or more, the board shall, when changing the boundaries of the divisions of the district pursuant to Section 21605, make such boundaries coincide with general county election precincts as nearly as may be practicable while keeping such divisions as nearly equal in population as may be practicable.
Source:
Section 22841.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=WAT§ionNum=22841.5..