Arizona Administrative Code
Title 12 - NATURAL RESOURCES
Chapter 15 - DEPARTMENT OF WATER RESOURCES
Article 7 - ASSURED AND ADEQUATE WATER SUPPLY
Section R12-15-724 - Phoenix AMA Calculation of Groundwater Allowance and Extinguishment Credits

1. If the application is for a certificate, multiply the applicable allocation factor in the table below by the annual estimated water demand for the proposed subdivision.

2. If the application is for a designation and the applicant provided water to its customers prior to February 7, 1995, multiply 7.5 by the total volume of water provided by the applicant to its customers from any source during calendar year 1994, consistent with the municipal conservation requirements established for the applicant pursuant to Section 5-103(A)(1) of the Second Management Plan for the Phoenix AMA.

3. If the application is for a designation and the applicant commenced providing water to its customers on or after February 7, 1995, the applicant's groundwater allowance is zero acre-feet.

4. For each calendar year of a designation, the Director shall calculate the volume of incidental recharge for a designated provider within the Phoenix AMA and add that volume to the designated provider's groundwater allowance. The Director shall calculate the volume of incidental recharge by multiplying the provider's total water use from any source in the previous calendar year by the standard incidental recharge factor of 4%. A designated provider may apply for a variance from the standard incidental recharge factor as provided in A.R.S. § 45-566.01(E)(1). The Director may establish a different incidental recharge factor for the designated provider if the provider demonstrates to the satisfaction of the Director that the ratio of the average annual amount of incidental recharge expected to be attributable to the provider during the management period, to the average amount of water expected to be withdrawn, diverted, or received for delivery by the provider for use within its service area during the management period, is different than 4%.

1. For the extinguishment of a type 2 non-irrigation grandfathered right, multiply the number of acre-feet indicated on the certificate by the difference between 2025 and the calendar year of extinguishment.

2. For the extinguishment of all or part of an irrigation grandfathered right, or all or part of a type 1 non-irrigation grandfathered right, multiply 1.5 acre-feet per acre by the number of irrigation acres associated with the extinguished irrigation grandfathered right or the number of acres to which the extinguished type 1 non-irrigation grandfathered right is appurtenant, and then multiply the product by the difference between 2025 and the calendar year of extinguishment, except that: