14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

THE CITY OF Chapter 4.: , _, � .. Water Use Characterization PL£ASANTON 4.2.3.2 Characteristic Five -Year Water Use Water Code Section 10635(b) requires urban suppliers to include a five-year DRA in their UWMP. A key component of the DRA is estimating demands for the next five years (2021-2025) without drought conditions (i.e., unconstrained demand). Chapter 7 details the DRA, but the five-year demand projections are summarized in Table 4-5. Demand projections for 2021-2024 were developed in coordination with Zone 7 based on the City's near-term delivery requests. Table 4-5. Projected Water Demands for Drought Risk Assessment Potable Water Demand('), AFY 15,246 1 16,240 16,410 16,570 16,740 (a) Demand projections developed in coordination with Zone 7 based on the City's near-term delivery requests. 4.3 DISTRIBUTION SYSTEM WATER LOSSES System losses are the difference between the actual volume of water treated and delivered into the distribution system and the actual metered consumption. Such apparent losses are always present in a water system due to pipe leaks, unauthorized connections or use, faulty meters, unmetered services such as fire protection and training, and system flushing. The City uses the American Water Works Association (AWWA) method to annually evaluate its distribution system losses. Since the City is currently working on its water audit for the 2020 calendar year, water losses for the 2020 calendar year were estimated based on supply and billing data. In 2020, the City's water losses were estimated to be approximately 1,308 AF, or 8.8 percent of total water production— comparable with the other Tri -Valley water service providers. A copy of the City's 2019 Water Loss Audit worksheet is provided in Appendix F. New regulations require retail water suppliers to include potable distribution system water losses for the preceding five years (to the extent records are available). Table 4-6 summarizes system losses for the previous five calendar years (2016 through 2020). At the time of preparation of this UWMP, DWR and the SWRCB are in the process of adopting water loss standards. This is discussed further in Chapter 9. Table 4-6. Last Five Years of Water Loss Audit Reporting (DWR Table 4-4 Retail) WEST YOST N-680-60-20-04-WP-R-680-2020UWMP Reporting Period Start Date (m m/yyyy) 01/2016 01/2017 01/2018 01/2019 01/2020 Volume of Water Loss 1,2 2,332 1,504 722 923 1,308 1 Taken from the field "Water Losses" (a combination of apparent losses and real losses) from the AWWA worksheet. Z Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Table 2-3. NOTES: Volumes are in AF; 2020 WaterAudit is in progress, so 2020 loss is an estimate based on supply and billing data. A copy of the City's 2019 WaterAudit is provided in Appendix F. 4-5 City of Pleasanton 2020 Urban Water Management Plan May 2021