The Tucson Active Management Area covers 3,866 square miles in southern Arizona. The Tucson AMA is one of five AMAs established pursuant to the 1980 Groundwater Management Act and administered by the Arizona Department of Water Resources.
The Tucson AMA is in the basin and range physiographic province (700 KB) which is characterized by broad, gently sloping alluvial basins separated by north to northwest trending fault block mountains. There are two groundwater sub-basins in the AMA, the Avra Valley Sub-basin and the Upper Santa Cruz Sub- basin.
The AMA includes portions of Pima, Pinal and Santa Cruz Counties, and five incorporated cities and towns: Tucson, South Tucson, Oro Valley, Marana and Sahuarita. The Pascua Yaqui tribal lands, part of the Schuk Toak District, and the entire San Xavier District of the Tohono O'odham Nation are within the AMA. The 2000 U.S. Census population was 836,000.
The original boundaries of the Tucson AMA included what is now the Santa Cruz AMA, which was created in 1994.
The Tucson AMA has a statutory goal of achieving safe-yield by 2025 and maintaining it thereafter. Safe-yield means that the amount of groundwater pumped from the AMA on an average annual basis does not exceed the amount that is naturally or artificially recharged. The safe-yield goal is a basin-wide balance. This means that water level declines in one portion of the AMA can be offset by recharging water in another part of the AMA. There are
The safe-yield goal was established as part of the 1980 Groundwater Management Act, and is intended to address the long-term implications of groundwater overdraft.
ADWR's water budgets provide a broad overview of an AMA's water resource situation and they serve as a tool for assessing progress towards achievement of management goals. Budgets include some factors that are directly measured, some that are estimated, and some that are long-term averages. ADWR's planning budgets are also complex because they must account for legal characteristics of water, including artificial groundwater recharge.
Management Plan Development and Modification
Transcripts of Public Hearings, Summary of Hearings and Findings, Orders of Adoption and Modification Language – On January 9, 2008, the Director issued orders promulgating proposed modifications to the Third Management Plans for the purpose of adding a modified Non-Per Capita Conservation Program. Public hearings on the proposed modifications were held in Phoenix, Casa Grande, Prescott, Nogales and Tucson during the first week of March, 2008. On April 1, 2008, the Director issued a summary of the hearings and findings with respect to the matters considered during the hearings (“Summary of Hearings and Findings”). In the Summary of Hearings and Findings, the Director indicated that two changes would be made to the proposed modifications in response to comments received during the public hearings. On April 1, 2008, the Director issued orders adopting the proposed modifications with the changes described in the Summary of Hearings and Findings.
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