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Virtual Tour Prescott AMA Active Management Area 2200 EastHillsdale Road 2200 Prescott, AZ 86301 www.azwater.gov Prescott (928) 778-7202 Prescott AMA r u o General Groundwater Facts T al u t r • New AMAs can be i • The Groundwater V Management Code was designated either by passed in June of 1980 determination by the and established the four director (45-412) or by initial Active Management petition of 10% of the Areas (AMA): Phoenix, registered voters within Tucson, Pinal and the boundary of the Prescott. proposed AMA (45-415). • The Prescott, Phoenix and • Each AMA shall have a Tucson AMAs have a goal groundwater user’s of safe-yield by 2025. advisory council (GUAC) of five members who are appointed by the Governor. 2 Prescott AMA r u o Active Management Areas (AMA) and T al Irrigation Non-expansion Areas (INA) u t r i V Arizona Prescott AMA 485 mile2 ~ 20,000 AF water use Santa Cruz AMA 750 mile2 ~ 20,000 AF water use Tucson AMA 3,800 mile2 ~ 300,000 AF water use Pinal AMA 4,000 mile2 ~ 800,000 AF water use Phoenix AMA 5,600 mile2 ~ 2 million AF water use 3 4 Virtual Tour Prescott AMA Prescott AMA r u o Prescott AMA T al u • The Prescott AMA, 100 miles t • Precipitation varies from 13 to 25 r i north & west of Phoenix, inches per year V comprises 485 square miles in central Yavapai County, Arizona • 2,900,000 acre feet of groundwater in storage in local sub-basins* • Elevation ranges from 4400’ to 7800’ above sea level • The 2003 to 2004 mean annual water-level decline rate was -2.7 • Vegetation varies from high feet* desert grasslands to conifer forests • Broad alluvial basins ringed by fault block mountains 5 *Prescott Active Management Area 2003-2004 Hydrologic Monitoring Report Prescott AMA r u o T Precipitation al u t r 25 in. i 13 in. V • Widely varying 21 in. precipitation events in the AMA are responsible for 100% of the natural aquifer 17 in. recharge 21 in. 25 in. 6 Prescott AMA r u o Prescott AMA T al Sub-basins u t r i V • Groundwater moves southeasterly in LITTLE CHINO the Upper Agua Fria subbasin and northeasterly in the Little Chino sub-basin UPPER AGUA FRIA 7 Prescott AMA r u o T Rivers & Streams al u t r i • Verde River V Big Draw Little Chino Wash Granite Creek • Agua Fria River Lynx Creek Clipper Wash • Hassayampa River 8 Prescott AMA r u o 2003 Water Budget T al Prescott AMA u t r i V Groundwater Inflows Groundwater Outflows Groundwater Pumpage: Natural Recharge 6,600 Non-Exempt wells 19,160 Incidental Recharge 2,020 Exempt Wells 1,830 Artificial Recharge: Groundwater Discharge: City of Prescott 3,480 Underflow to Big Chino 1,800 Prescott Valley 1,740 Del Rio Springs Discharge 1,050 Total Inflows 13,840 Agua Fria Baseflow 1,300 Total Outflow 25,140 Inflow - Outflow = Change in Storage 13,840 – 25,140 = -11,300 acre-feet (overdraft) 9 Prescott AMA r u o T Total Groundwater Pumped (1990-2004) al u t r i Highest Volume = 21,815 AF V Prescott AMA Groundwater Pumping Lowest Volume = 12,007 AF 24,000 Average over last 15 years = 16,600 AF 22,000 Average over last 5 years 20,000 = 19,148 AF 18,000 Pumping from exempt wells 16,000 Acre-feet is estimated to be 14,000 approximately 2,000 AF 12,000 Over the last 5 years, the 10,000 combined annual pumping 1990 1992 1994 1996 1998 2000 2002 2004 from exempt and non- Year exempt wells is approximately 21,148 AF of groundwater. 10 Prescott AMA r u o Changes in Water Levels in Wells in the T al Prescott AMA u t r i Period of Wells showing Wells showing Wells showing V Change Increases in Decreases in no change in water levels water levels water levels (% of whole) (% of whole) (% of whole) 2003-2004 10 90 0 2002-2003 22 76 2 2001-2002 12 87 1 2000-2001 10 89 1 1999-2000 24 73 3 For 2003-2004, the maximum and minimum increases were 16.5 and 0.2 feet respectively. The maximum and minimum decreases were -31.9 and -.1 feet, respectively. 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