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Santa Ana 2020 Urban Water Management Plan <br />arcadis.com <br />ii <br />Water Use Projections ................................................................................................................. 4-3 <br />4.3.1 Water Use Projection Methodology........................................................................................ 4-3 <br />4.3.1.1 Weather Variability and Long-Term Climate Change Impacts ....................................... 4-5 <br />4.3.2 25-Year Water Use Projection ............................................................................................... 4-5 <br />4.3.2.1 Water Use Projections for 2021-2025 ............................................................................ 4-6 <br />4.3.2.2 Water Use Projections for 2025-2045 ............................................................................ 4-6 <br />4.3.2.3 Water Use Projections for Lower Income Households .................................................. 4-8 <br />Water Loss ................................................................................................................................. 4-10 <br />5 Conservation Target Compliance..................................................................................................... 5-13 <br />Baseline Water Use ................................................................................................................... 5-13 <br />5.1.1 Ten to 15-Year Baseline Period (Baseline GPCD) .............................................................. 5-14 <br />5.1.2 Five-Year Baseline Period (Target Confirmation) ................................................................ 5-14 <br />5.1.3 Service Area Population ....................................................................................................... 5-14 <br />SBx7-7 Water Use Targets ........................................................................................................ 5-14 <br />5.2.1 SBx7-7 Target Methods ....................................................................................................... 5-15 <br />5.2.2 2020 Targets and Compliance ............................................................................................. 5-15 <br />Orange County 20x2020 Regional Alliance .............................................................................. 5-17 <br />6 Water Supply Characterization .......................................................................................................... 6-1 <br />Water Supply Overview ............................................................................................................... 6-1 <br />Imported Water ............................................................................................................................ 6-4 <br />6.2.1 Colorado River Supplies ........................................................................................................ 6-5 <br />6.2.2 State Water Project Supplies ................................................................................................. 6-7 <br />6.2.3 Storage ................................................................................................................................. 6-11 <br />6.2.4 Planned Future Sources ...................................................................................................... 6-12 <br />Groundwater .............................................................................................................................. 6-12 <br />6.3.1 Historical Groundwater Production ...................................................................................... 6-13 <br />6.3.2 Basin Characteristics ........................................................................................................... 6-14 <br />6.3.3 Sustainable Groundwater Management Act ........................................................................ 6-17 <br />6.3.4 Basin Production Percentage ............................................................................................... 6-17 <br />6.3.4.1 2020 OCWD Groundwater Reliability Plan .................................................................. 6-19 <br />6.3.4.2 OCWD Engineer’s Report ............................................................................................ 6-19