Macro-Rainwater Harvesting and Evaporation Interception Prescott Active Management Area
Macro-Rainwater Harvesting and Evaporation Interception Prescott Active Management Area Total AMA Basin Area = 485 Sq Mi Little Chino Subbasin Area = 310 Sq Mi Aqua Fria Subbasin Area = 175 Sq Mi ADWR Third Management Plan, Chapter 1 Declining Groundwater Levels in the Prescott AMA Prescott AMA Groundwater Hydrographs J I A H B G F C D E Total Volume Pumped in Prescott AMA in 2007 Current Annual Groundwater Level Decreases in Prescott AMA Current Annual Groundwater Volume Decreases in Prescott AMA Prescott AMA Water Budget – Existing Condition Precipitation ~16 IN/YR Evapotranspiration 414,000 AF/YR 407,200 AF/YR (100.0%) (98.4%) Surface Outflows 0 AF/YR NATURAL SURFACE WATER OUTFLOWS ENVIRONMENT USE Natural Recharge 6,800 AF/YR (1.6%) Well Pumping 23,700 AF/YR* 4,500 AF/YR Deficit = Effluent, Surface 14,700 AF/YR Water & Incidental Recharge 6,700 AF/YR* * Well pumping includes exempt well pumping estimate by CE of 2,968 AF/YR. Above values from “Prescott AMA Groundwater Flow Model Update Effluent recycle =3,400 AF/YR (COP, PV & CV). Surface water recharge = 1,400 Report”, October 31, 2006, ADWR Prescott AMA “2007 Annual Report” and AF/YR. Incidental recharge = 1,900 AF/YR (50% of Irrigation) Aquifers City of Prescott “Assured Water Supply Portfolio Summary”. Coconino Plateau Water Balance = 3.5% = 2.3% = 94.2% Prescott AMA Water Budget – Balanced Condition Precipitation ~16 IN/YR Evapotranspiration 414,000 AF/YR 392,500 AF/YR (100.0%) (94.8%) Surface Outflows 0 AF/YR NATURAL SURFACE WATER OUTFLOWS ENVIRONMENT USE Natural MRH / EI Recharge 14,700 AF/YR 6,800 AF/YR (3.6%) (1.6%) Well Pumping 23,700 AF/YR* 4,500 AF/YR Effluent, Surface Deficit = 0 Water & Incidental Recharge 6,700 AF/YR* * Well pumping includes exempt well pumping estimate by CE of 2,968 AF/YR.
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