SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

City of Millbrae Water Service Area 1
DSS Input Sheet
FINAL INPUT SHEET
Base Year Average Use and Indoor Percentages by Billing Category for DSS Model 2
Single Family
Multifamily
Commercial
Business
Institutional
City
Irrigation
Temporary
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 259 68% 1500 87% 1674 99% 4902 88% 1474 36% 1100 30% 2577.5 12% 45000 4%
Data for DSS Model - - Base Year 2001
Number of Water Use Water Use,
Total Dwelling Units in Census 2000 for Millbrae
Category Accounts 2001 MGD Use Profile Water Use Indoor Water Use
FY. 2001 3 gpd/a 2 2001 Percent gcd gcd
Single Family 5,694 259 1.47 50.49% 94 63
Multifamily 254 1,500 0.38 13.04% 66 58
Commercial 248 1,674 0.41 14.20%
Business 40 4,902 0.20 6.74%
Single family
2000 Units
No. Buildings
Institutional 71 1,474 0.10 3.58% 1-detached 5,317 5,317
City 28 1,100 0.03 1.05% 1-attached 269 269
Irrigation 54 2,578 0.14 4.74% Subtotal 5,586 5,586 5,694 108
Temporary 4 45,000 0.18 6.16% Multi family
Total 6,393 2.92 100.00% 2-units 210 105
Total Water Purchased (produced) 4 = 2.69 MGD 3-4 units 214 61
Unaccounted For Water (UFW) 5 = 2% Percent From 5 year BAWUA Survey average 5 to 9 units 604 86
Estimated UFW for DSS Model = 7% Percent 7% if actual is < 7%, otherwise = E25 10-19 units 401 27
Water Produced for use in DSS Model 3.13 MGD Add UFW to Total Water Use 20 or more units 1,088 22
Peaking Factor 1.51 Provided by Agency or SFPUC Water Master Plan (or NA) mobile homes 11 0
Peaking Factor for DSS Model= 1.5 If NA use default value of 1.6. Subtotal 2,528 301 254 -47
- Yellow cells are input to DSS Model MF Average = 8.4 units/building 10.0 units/account
NOTES Total SF + MF units = 8,114
1. - Communities served (includes all or portions of) Millbrae and nearby unincorporated areas according to BAWUA survey
Population and Household Size in Census 2000 for Millbrae
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
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 Water (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.
Estimated
Residential
City of Millbrae City of Millbrae Service Area
Census Population Estimated Population Population
Reconcile agency account billing data and census data
Service Area Billing
Accounts - Year 2000
3
Data Sources / Notes
Data Sources / Notes
2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF Projections): 0.40%
Total Population from Census data 6 = 20,718 20800 Estimated employment growth from 2000 to 2001 (ABAG Employment Projections): 0.60%
Subtract Institutionalized Population = 317 318 Water use for the institutionalized population is accounted for in nonresidential billing categories
Residential Population = 20,401 20,482 Residential population shown corresponds to the city or cities represented by Census data
Avg. HHS 7 = 2.51
MF Pop @ MF HHS 7 = 2.18 5,511 5,533 5,761 27.0% Percent of Population that is MF
SF Pop = 14,890 14,949 15,699 73.0% Percent of Population that is SF
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
SF HHS 7 = 2.67
area city or cities.
Total 21,460 100.0%
2000 Census Data -96 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys
Average household size 2.56 -414 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population
Average household size of owner-occupied unit 2.71
Average household size of renter-occupied unit 2.30 Estimate Service Area Dwelling Units for 2001
Homeowner vacancy rate (percent) 0.40 SF Res 5,608 Equals No. Buildings from cell M21 plus growth in accounts for one year from cell T38
Rental vacancy rate (percent) 2.60 MF Res 2,528 Equals billing accounts in 2001 from cell C16 times average units per account in cell N30 (or average units per building in cell L30 to minimize population difference in cell N47)
Difference between
billing and census
data
Housing Characteristics from U.S. Census Bureau
Meter for assumed 50 units per building
Meter for mobile home parks, assume 50 per park
Must be more than one building on an MF meter
Population and Employment Estimates Corresponding to Service Area
Population
Employment
2000 Census data for jurisdiction 20,718 NA
2000 ABAG (jurisdictional) 20,718 6,030
2005 ABAG Projection (jurisdictional) 21,400 6,210
2000 ABAG (subregional) 20,718 6,030
Data Prepared : August 15, 2003 By: B. Skeens 2005 ABAG Projection (subregional) 21,400 6,210
Revised: September 5, 2003 2000 Department of Finance Benchmark 20,718 From State of California Department of Finance (DOF) table E-4 as of 4-1-2000. Website www.dof.ca.gov
2001 Department of Finance Estimate 20,800 From State of California Department of Finance table E-4 as of 1-1-2001. Website www.dof.ca.gov
2002 Department of Finance Estimate 20,750 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 21,394 NA
FY 2001-2002 BAWUA service area 21,718 NA
2001 Employment in Service Area (input to DSS Model) = 6,664 Service Area Employment is determined by the ratio of the 2000-2001 BAWUA service area population to the
2000 ABAG Subregional Population and escalated to 2001 using the assumed growth rate in cell T39.
Definitions / Abbreviations
ABAG Association of Bay Area Governments MF multi family
BAWUA Bay Area Water 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 DOF California Department of Finance