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water year supplies to calculate expected outcomes in terms of the percentage of water used. Using normal
<br />water year demands serves as a proxy for the amount of supplies that would be used in a normal water year,
<br />which helps alleviate issues associated with how supply capability is presented to fulfill requirements of the UWMP
<br />Act versus how supplies might be accounted for to demonstrate consistency with WR P1.
<br />Because WR P1 considers water use efficiency savings a source of water supply, water suppliers such as the City
<br />need to explicitly calculate and report water use efficiency savings separate from service area demands to
<br />properly reflect normal water year demands in the calculation of reduced reliance. As explained in the Guidebook
<br />Appendix C, water use efficiency savings must be added back to the normal year demands to represent demands
<br />without water use efficiency savings accounted for; otherwise the effect of water use efficiency savings on
<br />regional self-reliance would be overestimated. Table C-1 shows the results of this adjustment for the City.
<br />Supporting narratives and documentation for the all of the data shown in Table C-1 are provided below.
<br />Table C -1 – Calculation of Water Use Efficiency
<br />Service Area Water Use Efficiency
<br />Demands
<br />Baseline
<br />(2010) 2015 2020 2025 2030 2035 2040
<br />Service Area Water Demands with Water
<br />Use Efficiency 50,190 47,800 37,007 33,633 34,146 33,881 33,589
<br />Non-Potable Water Demands 190 300 320 249 249 249 249
<br />Potable Service Area Demands with Water
<br />Use Efficiency 50,000 47,500 36,687 33,384 33,897 33,632 33,340
<br />Total Service Area Population Baseline
<br />(2010) 2015 2020 2025 2030 2035 2040
<br />Service Area Population 324,924 338,336 335,086 343,358 347,511 347,952 347,785
<br />Water Use Efficiency Since Baseline Baseline
<br />(2010) 2015 2020 2025 2030 2035 2040
<br />Per Capita Water Use (GPCD) 137 125 98 87 87 86 86
<br />Change in Per Capita Water Use from
<br />Baseline (GPCD) (12) (40) (51) (50) (51) (52)
<br />Estimated Water Use Efficiency Since
<br />Baseline 4,564 14,877 19,453 19,579 19,912 20,178
<br />Total Service Area Water Demands Baseline
<br />(2010) 2015 2020 2025 2030 2035 2040
<br />Service Area Water Demands with Water
<br />Use Efficiency 50,190 47,800 37,007 33,633 34,146 33,881 33,589
<br />Estimated Water Use Efficiency Since
<br />Baseline 4,564 14,877 19,453 19,579 19,912 20,178
<br />Service Area Water Demands without
<br />Water Use Efficiency 50,190 52,364 51,884 53,086 53,725 53,793 53,767
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