Ariz. Rev. Stat. § 48-3779
D. When the district has determined the amount of revenues to be raised through the annual membership dues, the district shall allocate the amount to be raised between member lands and member service areas prorated on the basis of the following two volumes:
2. Total planned annual service area replenishment obligations for all member service areas. The planned annual service area replenishment obligation for a member service area is the lesser of:
F. The total amount allocated to member service areas in any year, as calculated pursuant to subsection D of this section, shall be prorated among all member service areas based on a uniform fee per acre-foot levied against the member service area's dues volume. The dues volume for a member service area is the greater of:
G. Except in the first full year following the year in which the director makes a determination that the district's most recent plan of operation is consistent with achieving the management goals of the active management areas pursuant to section 45-576.03, subsection M, for any year in which the dues volume for a member service area, as determined pursuant to subsection F of this section, exceeds the previous year's dues volume for the member service area, a makeup charge shall be added to the annual membership dues allocated under subsection F of this section to the member service area. The makeup charge shall become part of the member service area's annual membership dues for that year and is the sum of:
1. The difference between the current year's dues volume and the previous year's dues volume, in acre-feet, multiplied by the sum of the uniform fees per acre-foot established pursuant to subsection F of this section for each year since the later of:
I. Annual membership dues collected by the district shall be deposited in a special fund established by the state to be spent by the district only for the purposes authorized by this article, including: