SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

Base Year Average Use and Indoor Percentages by Billing Category for DSS Model 2
Single family
Apartments
Commercial
Commercial Irrigation
Municipal
Residential Irrigation
Other
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 289 66% 1,374 78% 1451 79% 3933 0% 2334 29% 2835 0% 2618 35%
Includes industrial and hospitals City Buildings Large turf areas such as homeowner associations Schools and Churches
Data for DSS Model - - Base Year 2001
Number of Water Use Water Use,
Total Dwelling Units in Census 2000 for Redwood City Service Area
Category Accounts 2001 MGD Use Profile Water Use Indoor Water Use
FY. 2001 3 gpd/a 2 2001 Percent gcd gcd
Single family 18,525 289 5.35 48.24% 104 68
Apartments 1,701 1,374 2.34 21.08% 77 60
Service Area Billing Difference
Commercial 1,439 1,451 2.09 18.84%
Accounts - Fiscal between billing
Commercial Irrigatio 245 3,933 0.96 8.70%
Single family
2000 Units
No. Buildings
Year 2001 3 and census data
Municipal 7 2,334 0.02 0.14% 1-detached 14,729 14,729
Residential Irrigation 80 2,835 0.23 2.05% 1-attached 3,974 3,974
Other 40 2,618 0.10 0.94% Subtotal 18,703 18,703 18,525 -178
0 0 0.00 0.00% Multi family
Total 22,037 11.08 100.00% 2-units 1,276 638
Total Water Purchased (produced) 4 = 11.81 MGD 3-4 units 1,629 465
Unaccounted For Water (UFW) 5 = 4.6% Percent From 5 year BAWUA Survey average 5 to 9 units 2,628 375
Estimated UFW for DSS Model = 7% Percent 7% if actual is < 7%, otherwise = E25 10-19 units 2,613 174
Water Produced for use in DSS Model 11.86 MGD Add UFW to Total Water Use 20 or more units 3,940 79
Peaking Factor NA Provided by Agency or SFPUC Water Master Plan (or NA) mobile homes 628 13
Peaking Factor for DSS Model= 1.6 If NA use default value of 1.6. Subtotal 12,712 1,744 1,701 -43
MF Average = 7.3 units/building 7.5 units/account
- Blue cells are entered by modeler
- Yellow cells are input to DSS Model Total SF + MF units = 31,416
NOTES Population and Household Size in Census 2000 for Redwood City Service Area Estimated
1. - Communities served (includes all or portions of) Redwood City, unincorporated areas of San Mateo county, Town of Woodside, and portions of the city
of San Carlos according to BAWUA survey. According to Redwood City agency, they only serve 1-3 blocks of San Carlos.
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. For Redwood City data was provided by the
city.
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 table on "Redwood City
Demographics" worksheet.
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.
Redwood City Water Service Area 1
DSS Input Sheet
FINAL INPUT SHEET
Reconcile agency account billing data 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.
Residential
Redwood City Service Area Redwood City Service Area
Based on 2000 Census Estimated Population (DOF) Population
Data Sources / Notes
2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF Projections): 0.72%
Total Population from Census data 6 = 83,000 83598 Estimated employment growth from 2000 to 2001 (ABAG Employment Projections): 0.77%
Subtract Institutionalized Population = 1,481 1492 Water use for the institutionalized population is accounted for in nonresidential billing categories
Residential Population = 81,519 82,106 Residential population shown corresponds to the city or cities represented by Census data
Avg. HHS 7 = 2.59
MF Pop @ MF HHS 7 = 2.38 30,256 30,474 30,256 37.1% Percent of Population that is MF
SF Pop = 51,263 51,633 51,633 62.9% Percent of Population that is SF
SF HHS 7 = 2.74
Total 81,888 100.0%
-1,112 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys
-2,603 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population
2000 Census Data
Average household size 2.62 Estimate Service Area Dwelling Units for 2001
Average household size of owner-occupied unit 2.61 SF Res 18,838 Equals No. Buildings from cell M21 plus growth in accounts for one year from cell T38
Average household size of renter-occupied unit 2.63 MF Res 12,712 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)
Homeowner vacancy rate (percent) 0.40
Rental vacancy rate (percent) 2.30 Population and Employment Estimates Corresponding to Service Area
Population
Employment
2000 Census data for jurisdiction 83,000 NA
2000 ABAG (jurisdictional) 82,944 65,838
2005 ABAG Projection (jurisdictional) 100,593 68,369
2000 ABAG (subregional) 86,434 62,297
2005 ABAG Projection (subregional) 104,558 65,319
2000 Department of Finance Benchmark 82,944 From State of California Department of Finance (DOF) table E-4 as of 4-1-2000. Website www.dof.ca.gov
Data Prepared : July 1, 2003 By: M. Maddaus 2001 Department of Finance Estimate 83,542 From State of California Department of Finance table E-4 as of 1-1-2001. Website www.dof.ca.gov
Revised: March 4, 2004 2002 Department of Finance Estimate 83,876 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 83,000 NA
FY 2001-2002 BAWUA service area 83,000 NA
2001 Employment in Service Area (input to DSS Model) = 66,389 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. (EXPLAIN SOURCE)
Data Sources / Notes
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