SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

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SECTIONTHREE Establishing Base - Year Conditions The first two categories typically comprise most residential water use, while the latter four categories typically comprise most non-residential water use. 10 The total water consumed was calculated by summing the total water billed by customer-billing category for each wholesale customer. Figure 3-2 shows the 2001 average water use of SFPUC wholesale customers by typical customer-billing category. Source: Wholesale Customer Billing Records 1 ”Other” category includes miscellaneous uses, institutional uses, municipal uses, irrigation/landscape use where these water uses are separately metered. Figure 3-2 Breakdown of SFPUC Wholesale Customer Water Consumption by Customer Category (2001 Base Year) Unaccounted-for-Water Unaccounted-for-water (UFW) is defined as the mathematical difference between the amount of water produced in a system and the water billed to customers (i.e., water actually consumed). This water is often referred to as “lost” water and includes water delivery system leaks and water not billed or tracked in the system (i.e., water used for flushing water system pipelines, fire fighting). It is necessary to estimate UFW to achieve an accurate account of the total water produced for each wholesale customer and how much is consumed by the various accounts served by the wholesale customer. 10 In some cases a wholesale customer had customer-billing categories unique to their service area. For these circumstances, inquiries were made to determine typical uses of water billed to these unique categories so that those accounts could be categorized in one of the typical categories shown above. Appendix B contains information specific to each wholesale customer on particular assumptions or modifications made unique to their model. 3-4
SECTIONTHREE Establishing Base - Year Conditions For this study, the 5-year average UFW was calculated for each wholesale customer. The two published sources of UFW estimates available are wholesale customer Urban Water Management Plans (UWMPs) and the BAWUA Annual Survey (BAWUA 2002). UWMPs are required by the State of California Urban Water Management Planning Act. The Act requires water agencies serving more than 3,000 accounts to prepare and adopt an UWMP every five years. UWMPs provide information on existing STANDARDIZED WATER USE DATA BY ACCOUNT TYPE (NATIONAL PUBLICATIONS) and future water demand and supplies. The BAWUA Annual Survey is a report prepared by the Bay Area Water Users Association (now BAWSCA) that documents the results of an annual survey of its members regarding current and future demand and other key agency-wide information. Information reported in the BAWUA Annual Survey is not independently verified by BAWUA. The information is reported as received from customer water use surveys and summarized in the BAWUA Annual Survey Report. Estimates for UFW reported in UWMPs varied between 1 percent and 11 percent. However, UFW estimates were omitted from many plans and provided as ranges in others. More complete data were provided in the BAWUA Annual Survey (BAWUA 2002). The average UFW reported by wholesale customers in the BAWUA Annual Survey was 5.5 percent and the median was 5.7 percent. These UFW estimates are low by national standards. An American Water Works Association report (AWWA 1996) concluded that the average UFW for systems in the United States is close to 15 percent. A 1982 study of state water agencies for the California Department of Water Resources estimated the average UFW in California to be 9.3 percent (DWR 1982). It is reasonable to assume that UFW will increase as pipes and other infrastructure components age. The American Water Works Association has in the past stated that a well-run water system should be able to maintain UFW below 10 percent. A minimum value for UFW of 7 percent was used in this study as a conservative estimate for future demands. This value allows water losses to increase a small amount (less than 2 percent), which is appropriate for an aging system that will be 30 years older at the end of the study period. For each wholesale customer the 5-year average UFW reported in the BAWUA Annual Survey was compared with the 7 percent minimum (BAWUA 2002). If the 5-year average was greater than 7 percent, then that value was used. Otherwise 7 percent was assumed. The assumed percentage of UFW was added to the total water consumed, obtained from billing data, to obtain the total water produced. Table 3-1 lists the total water consumed, the assumed UFW, and the resulting total water production for each wholesale customer. Figure 3-3 illustrates the breakdown of the total water produced for each wholesale customer into residential water consumed, non-residential water consumed and UFW. 3-5
Page 1 and 2: San Francisco Public Utilities Comm
Page 3 and 4: List of Tables, Figures, and Append
Page 5 and 6: List of Tables, Figures, and Append
Page 7 and 8: Glossary Account Average gal/day/ac
Page 9 and 10: Executive Summary INTRODUCTION In F
Page 11 and 12: Section 1 Introduction
Page 13 and 14: SECTIONONE Introduction retail serv
Page 15 and 16: SECTIONONE Introduction 1.3 GENERAL
Page 17 and 18: Section 2 Approach to Developing Wa
Page 19 and 20: SECTIONTWO Approach to Developing W
Page 21 and 22: SECTIONTWO Approach to Developing W
Page 23 and 24: SECTIONTHREE Establishing Base - Ye
Page 25: SECTIONTHREE Establishing Base - Ye
Page 49 and 50: Section 4 Water Demand Forecasting
Page 51 and 52: SECTIONFOUR Water Demand Forecastin
Page 57 and 58: Section 5 Water Demand Projections
Page 59 and 60: SECTIONFIVE Water Demand Projection
Page 61 and 62: SECTIONFIVE Water Demand Projection
Page 63 and 64: Section 6 References
Page 65 and 66: SECTIONSIX References Hayward, City
Page 67 and 68: Appendix A Description of SFPUC Who
Page 73 and 74: Appendix B Summary of Customer-Spec
Page 75 and 76: Wholesale Customer Estero MID/Foste
Page 77 and 78:
Wholesale Customer Milpitas, City o
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Appendix B Summary of Customer-Spec
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Appendix C1 Alameda County Water Di
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66.0 64.0 62.0 60.0 58.0 56.0 54.0
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City of Brisbane Water Service Area
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Appendix C3 Burlingame, City of
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5.00 4.95 4.90 4.85 4.80 4.75 4.70
Page 91 and 92:
Cal Water Bear Gulch Water Service
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Appendix C5 California Water Servic
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18.40 18.20 18.00 17.80 17.60 17.40
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Cal Water South San Francisco (SSF)
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Appendix C7 Coastside County Water
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4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2
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City of Daly City Water Service Are
Page 105 and 106:
Appendix C9 East Palo Alto, City of
Page 107 and 108:
5.0 4.5 4.0 3.5 3.0 2.5 2.0 City of
Page 109 and 110:
Estero Municipal Improvement Distri
Page 111 and 112:
Appendix C11 Guadalupe Valley Munic
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1.2 1.0 0.8 0.6 0.4 0.2 0.0 Guadalu
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Base Year Average Use and Indoor Pe
Page 117 and 118:
Appendix C13 Hillsborough, Town of
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4.00 3.90 3.80 3.70 3.60 3.50 Town
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Los Trancos Woods Northern, Blue Oa
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Appendix C15 Menlo Park, City of
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5.2 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6
Page 127 and 128:
Mid Peninsula (Belmont) Water Servi
Page 129 and 130:
Appendix C17 Millbrae, City of
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3.7 3.65 3.6 3.55 3.5 3.45 3.4 3.35
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City of Milpitas Water Service Area
Page 135 and 136:
Appendix C19 Mountain View, City of
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15 14.9 14.8 14.7 14.6 14.5 14.4 14
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North Coast County WD Water Service
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Appendix C21 Palo Alto, City of
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15.5 15.0 14.5 14.0 13.5 City of Pa
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Purissima Hills Water District Serv
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Appendix C23 Redwood City, City of
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14.5 14.0 13.5 13.0 12.5 12.0 11.5
Page 151 and 152:
City of San Bruno Water Service Are
Page 153 and 154:
Appendix C25 San Jose, City of (por
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7 6.9 6.8 6.7 6.6 6.5 6.4 6.3 6.2 6
Page 157 and 158:
City of Santa Clara Water Service A
Page 159 and 160:
Appendix C27 Skyline County Water D
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0.35 0.30 0.25 0.20 0.15 Skyline Co
Page 163 and 164:
Stanford University Water Service A
Page 165 and 166:
Appendix C29 Sunnyvale, City of
Page 167 and 168:
28.0 27.0 26.0 25.0 24.0 23.0 City
Page 169 and 170:
Westborough County Water District S
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Appendix D Summary of SFPUC Wholesa
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Page 175:
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