California Code, Water Code - WAT § 75478

Upon an order that the district be divided into more than one zone, the charge per acre made pursuant to Section 75471 shall be multiplied by the percentage of benefit applicable to the zone or zones within which the acreage is located, and shall then be increased by the factor necessary so that the total amount to be collected shall be equal to the amount determined to be required pursuant to Section 75470.5.