SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

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SECTIONTHREE Establishing Base - Year Conditions Fixture Model Water Use Computation In the fixture model the amount of water used by an end use is the product of the amount of water used by the fixture per use multiplied by the number of users in the customer-billing account (i.e., persons per household or employees per account) multiplied by the number of uses per day. An example of toilet use computed by a fixture model is shown below: • Single-Family Residential Toilet Use (sample values in a fixture model) – Average users per Single-Family account (household size): 3.0 people per household – Average toilet flush volume in service area 12 : 3.5 gallons per flush – Average flushes per person per day: 5.0 times per day – Volume used to flush toilets: 3.0 x 3.5 x 5.0 = 52.5 gal/day/household Comparing Fixture Model Computations with Indoor and Outdoor Use The fixture model computations for each end use by customer-billing category are compared to the percentage of indoor and outdoor water use and by end use for a customer-billing account provided by AWWARF, presented in Table 3-3. Consistent with the fixture model computation provided above, if the single-family indoor use for a particular account is 200 gal/day and the percentage allocated to toilets is 26.7% (Mayer et al. 1999; see Table 3-3), then 53.4 gal/day of the 200 gal/day are used for toilet flushing in the house. Comparing the 53.4 gal/day with the computed value in the fixture model for toilet flushing in that house there is a difference of 1.4 gal/day. Therefore, adjustments need to be performed to either the fixture model or the percentage of water use by end use so that these two numbers match. Matching Fixture Model Computations with Initial End-Use Percentages The fixture model computations and the end-use percentages can be matched in two ways: either adjust the fixture model components or adjust the initial percentages of end use for total water. In this example, small adjustments can be made to the fixture model to increase the volume used to flush toilets up to 53.4 gal/day or small adjustments can be made to the percentage of water use associated with toilets to reduce its value to 52.5 gal/day. For example, adjusting the fixture model may involve increasing the number of flushes per person per day from 5.0 to 5.086 or decreasing the percentage of indoor use water use allocated to toilets to 26%. 12 Average toilet flush volume is derived by taking the initial proportions of each type of fixture (Table 3-10) combined with the volume-per-use estimates (Table 3-12) computing a service-area-specific volume-per-use weighted average. 3-24
SECTIONTHREE Establishing Base - Year Conditions 1 ”RSF Other” category water use includes miscellaneous uses not included in one of the other categories, such as cleaning, indoor plant irrigation, etc. in RSF households. (see AWWARF) 2 ”RSF Int. (Internal) Leakage” category water use includes metered water leakage from fixtures and appliances in RSF households. (see AWWARF) Figure 3-6 Breakdown of SFPUC Wholesale Customer Area Indoor Single-Family Water Consumption by End Use (2001 Base Year) 1 ”RMF Other” category water use includes miscellaneous uses not included in one of the other categories, such as cleaning, indoor plant irrigation, etc. in RMF households. (see AWWARF) 2 ”RMF Int. (Internal) Leakage” category water use includes metered water leakage from fixtures and appliances in RMF households. (see AWWARF) Figure 3-7 Breakdown of SFPUC Wholesale Customer Area Indoor Multi-Family Water Consumption by End Use (2001 Base Year) 3-25
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 45: 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
Page 79 and 80: Appendix B Summary of Customer-Spec
Page 81 and 82: Appendix C1 Alameda County Water Di
Page 83 and 84: 66.0 64.0 62.0 60.0 58.0 56.0 54.0
Page 85 and 86: City of Brisbane Water Service Area
Page 87 and 88: Appendix C3 Burlingame, City of
Page 89 and 90: 5.00 4.95 4.90 4.85 4.80 4.75 4.70
Page 91 and 92: Cal Water Bear Gulch Water Service
Page 93 and 94: Appendix C5 California Water Servic
Page 95 and 96: 18.40 18.20 18.00 17.80 17.60 17.40
Page 97 and 98:
Cal Water South San Francisco (SSF)
Page 99 and 100:
Appendix C7 Coastside County Water
Page 101 and 102:
4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2
Page 103 and 104:
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
Page 113 and 114:
1.2 1.0 0.8 0.6 0.4 0.2 0.0 Guadalu
Page 115 and 116:
Base Year Average Use and Indoor Pe
Page 117 and 118:
Appendix C13 Hillsborough, Town of
Page 119 and 120:
4.00 3.90 3.80 3.70 3.60 3.50 Town
Page 121 and 122:
Los Trancos Woods Northern, Blue Oa
Page 123 and 124:
Appendix C15 Menlo Park, City of
Page 125 and 126:
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
Page 131 and 132:
3.7 3.65 3.6 3.55 3.5 3.45 3.4 3.35
Page 133 and 134:
City of Milpitas Water Service Area
Page 135 and 136:
Appendix C19 Mountain View, City of
Page 137 and 138:
15 14.9 14.8 14.7 14.6 14.5 14.4 14
Page 139 and 140:
North Coast County WD Water Service
Page 141 and 142:
Appendix C21 Palo Alto, City of
Page 143 and 144:
15.5 15.0 14.5 14.0 13.5 City of Pa
Page 145 and 146:
Purissima Hills Water District Serv
Page 147 and 148:
Appendix C23 Redwood City, City of
Page 149 and 150:
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
Page 155 and 156:
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
Page 161 and 162:
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
Page 171 and 172:
Appendix D Summary of SFPUC Wholesa
Page 173 and 174:
Page 175:
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