Appendix C22 Purissima Hills <strong>Water</strong> District
Purissima Hills <strong>Water</strong> District Service Area 1 DSS Input Sheet FINAL INPUT SHEET Base Year Average Use and Indoor Percentages by Billing Category for DSS Model 2 Old SF Res Multifamily Commercial Industrial New/Renovated SF Res Year Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor Average, gpd/a Indoor 2001 716 35% 0 0% 2530 26% 1605 16% Data for DSS Model - - Base Year 2001 Reconcile agency account billing data and census data Number of <strong>Water</strong> Use <strong>Water</strong> Use, Total Dwelling Units in Census 2000 for Town of Los Altos Hills Category Accounts 2001 MGD Use Profile <strong>Water</strong> Use Indoor <strong>Water</strong> Use FY. 2001 3 gpd/a 2 2001 Percent gcd gcd Old SF Res 1,580 716 1.13 55.58% 188 66 Multifamily 0 0 0.00 0.00% Service Area Billing Difference between Commercial 62 2,530 0.16 7.76% Accounts - Year 2000 billing and census Industrial 0 0 0.00 0.00% Single family 2000 Units No. Buildings 3 data New/Renovated SF R 465 1,605 0.75 36.67% 1-detached 2,771 2,771 0 0 0 0.00 0.00% 1-attached 32 32 0 0 0 0.00 0.00% Subtotal 2,803 2,803 2,034 -769 Housing Characteristics from U.S. Census Bureau 0 0 0 0.00 0.00% Multi family Total 2,107 2.04 100.00% 2-units 17 9 Total <strong>Water</strong> Purchased (produced) 4 = 2.20 MGD 3-4 units 0 0 Unaccounted For <strong>Water</strong> (UFW) 5 = 5% Percent From 5 year BAWUA Survey average 5 to 9 units 0 0 Estimated UFW for DSS Model = 7.0% Percent 7% if actual is < 7%, otherwise = E25 10-19 units 0 0 <strong>Water</strong> Produced for use in DSS Model 2.18 MGD Add UFW to Total <strong>Water</strong> Use 20 or more units 9 9 Assumed a meter for each unit. Peaking Factor 1.78 Provided by Agency or <strong>SFPUC</strong> <strong>Water</strong> Master Plan (or NA) mobile homes 6 6 Assumed a meter for each unit. Peaking Factor for DSS Model= 1.78 If NA use default value of 1.6. Subtotal 32 24 0 -24 MF Average = 1.36 units/building #DIV/0! units/account - Blue cells are entered by modeler - Yellow cells are input to DSS Model Total SF + MF units = 2,835 Data Sources / Notes NOTES Population and Household Size in Census 2000 for Town of Los Altos Hills Estimated 1. - Communities served (includes all or portions of) the Town of Los Altos and nearby unincorporated areas according to BAWUA survey Residential Town of Los Altos Hills Town of Los Altos Hills Service Area 2 - Average gpd/a is based on a 12-month moving average through December 2001. Indoor use is based on average of 2 lowest consecutive months in the Census Population Estimated Population Population winter if meters read bimonthly, or single lowest month if meters read monthly. 3 - Number of accounts is from data provided by water agency for this project (see worksheet with account data in this file) 4 - Total water Purchased (produced) taken from BAWUA for Fiscal Year 2001-2002 or agency if provided. 5 - Unaccounted for <strong>Water</strong> (UFW) is the percent difference between the total water purchased and the total water use. 6 - For reference see additional population estimates provided in population and employment estimates corresponding to service area table. 7 - Initial estimate based on census data for renter occupied units. For reference see table below that has 2000 census data for corresponding water service area city or cities. This estimate was revised in order to produce a service area population closer to the BAWUA survey for 2001-2002. 2000 Census Data Average household size 2.86 Estimate Service Area Dwelling Units for 2001 Average household size of owner-occupied unit 2.88 SF Res 2,045 Equals billing accounts in 2001 from cell C15 Average household size of renter-occupied unit 2.53 MF Res 0 Assume no multi-family dwelling units. Homeowner vacancy rate (percent) 0.70 Rental vacancy rate (percent) 2.90 Population and Employment Estimates Corresponding to Service Area Population Employment 8 -"Old" SF residencial accounts are assumed to use the rate of water use given by 1994 billing records: 716 gpd/account. The number of "old" versus "new/renovated" residential accounts was determined by assuming a 3% renovation rate since 1994. This assumption corresponds to a "new/renovated" water usage of 1605 gpd/account in order to maintain the average water use for all residential accounts as given by the billing data for 2001. Data Sources / Notes 2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF <strong>Projections</strong>): 0.61% Total Population from Census data 6 = 7,902 7950 Estimated employment growth from 2000 to 2001 (ABAG Employment <strong>Projections</strong>): 0.07% Subtract Institutionalized Population = 0 0 <strong>Water</strong> use for the institutionalized population is accounted for in nonresidential billing categories Residential Population = 7,902 7,950 Residential population shown corresponds to the city or cities represented by Census data Avg. HHS 7 = 2.79 MF Pop @ MF HHS 7 = 2.86 92 92 0 1.2% Percent of Population that is MF SF Pop = 7,810 7,858 6,032 98.8% Percent of Population that is SF SF HHS 7 = 2.95 Total 6,032 100.0% 95 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys 95 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population 2000 Census data for jurisdiction 7,902 NA 2000 ABAG (jurisdictional) 7,902 2,720 2005 ABAG Projection (jurisdictional) 8,300 2,730 2000 ABAG (subregional) 9,455 2,720 2005 ABAG Projection (subregional) 10,000 2,730 2000 Department of Finance Benchmark 7,902 From State of California Department of Finance (DOF) table E-4 as of 4-1-2000. Website www.dof.ca.gov Data Prepared : July 24, 2003 By: N. Foged 2001 Department of Finance Estimate 7,950 From State of California Department of Finance table E-4 as of 1-1-2001. Website www.dof.ca.gov Revised: August 15, 2003 By: J. Hudson 2002 Department of Finance Estimate 8,000 From State of California Department of Finance table E-4 as of 1-1-2002. Website www.dof.ca.gov FY 2000-2001 BAWUA service area 5,800 NA FY 2001-2002 BAWUA service area 6,075 NA Service Area Employment is determined by the ratio of the 2000-2001 BAWUA service area population 2001 Employment in Service Area (input to DSS Model) = 420 to the 2000 ABAG Subregional Population and escalated to 2001 using the assumed growth rate (ABAG, 2002). In order to obtain at least 50 gal/employee/day, this value was multiplied by 0.25. Definitions / Abbreviations ABAG Association of Bay Area Governments MF multi family BAWUA Bay Area <strong>Water</strong> Users Association MGD million gallons per day DSS Decision Support System Model No. number du dwelling unit Pop population FY Fiscal Year Res residential gpd/a gallons per day / per account SF single family gpd gallons per day UFW unaccounted for water HHS household size
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San Francisco Public Utilities Comm
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List of Tables, Figures, and Append
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List of Tables, Figures, and Append
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Glossary Account Average gal/day/ac
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Executive Summary INTRODUCTION In F
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Section 1 Introduction
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SECTIONONE Introduction retail serv
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SECTIONONE Introduction 1.3 GENERAL
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Section 2 Approach to Developing Wa
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SECTIONTWO Approach to Developing W
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Section 4 Water Demand Forecasting
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SECTIONFOUR Water Demand Forecastin
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SECTIONFOUR Water Demand Forecastin
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SECTIONFOUR Water Demand Forecastin
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Section 5 Water Demand Projections
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SECTIONFIVE Water Demand Projection
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SECTIONFIVE Water Demand Projection
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Section 6 References
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SECTIONSIX References Hayward, City
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Appendix A Description of SFPUC Who
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Appendix A Description of SFPUC Who
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Appendix A Description of SFPUC Who
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Appendix B Summary of Customer-Spec
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Wholesale Customer Estero MID/Foste
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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
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Cal Water Bear Gulch Water Service
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