SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

Westborough County Water District 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
Industrial
Irrigation
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 195 92% 10668 89% 1269 89% 1350 15%
Data for DSS Model - - Base Year 2001
Reconcile agency account billing data and census data
Number of Water Use Water Use,
Total Dwelling Units in Census 2000 for the portion of South San Francisco in Westborough County Water District
Category Accounts 2001 MGD Use Profile Water Use Indoor Water Use
FY. 2001 3 gpd/a 2 2001 Percent gcd gcd
Single Family 3,336 195 0.65 70.10% 73 67
Multifamily 6 10,668 0.06 6.90% 61 55
Service Area Billing Difference between
Commercial 76 1,269 0.10 10.35%
Accounts - Year 2000 billing and census
Industrial 0 0.00 0.00%
Single family
2000 Units
No. Buildings
3
data
Data Sources / Notes
Irrigation 87 1,350 0.12 12.66% 1-detached 3,340 3,340
0 0 0.00 0.00% 1-attached 0 0
0 0 0.00 0.00% Subtotal 3,340 3,340 3,340 0 Assume each residential account corresponds to one single family detached unit in the Census (2000)
0 0 0.00 0.00% Multi family
Total 3,505 0.93 100.00% 2-units 0 0
Total Water Purchased (produced) 4 = 1.02 MGD 3-4 units 0 0
Unaccounted For Water (UFW) 5 = 5.4% Percent From 5 year BAWUA Survey average 5 to 9 units 0 0
Estimated UFW for DSS Model = 7% Percent 7% if actual is < 7%, otherwise = E25 10-19 units 0 0
Water Produced for use in DSS Model 0.99 MGD Add UFW to Total Water Use 20 or more units 550 6
The number of multi-family units is assumed to be 550 and the number of accounts servicing these units
Peaking Factor 3.68 Provided by Agency or SFPUC Water Master Plan (or NA) mobile homes 0 0
is 6 (Westborough Water District Urban Water Management Plan, 2000).
Peaking Factor for DSS Model= 3.7 If NA use default value of 1.6. Subtotal 550 6 6 0 Must be more than one building on an MF meter. (ONLY USE THIS NOTE IF BUILDINGS>METERS)
MF Average = 91.7 units/building 91.7 units/account Units inlude all multi-family dwellings plus the "1-attached" dwellings.
- Blue cells are entered by modeler
- Yellow cells are input to DSS Model Total SF + MF units = 3,890
NOTES
1. - Westborough County Water District serves the Westborough area within South San Francisco.
Population and Household Size in Census 2000 forSouth San Francisco
The Portion of South San
Francisco within
Westborough CWD
The Portion of South San
Francisco within
Westborough CWD
Estimated
Residential
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
Data Sources / Notes
winter (meters read bimonthly).
2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF Projections): 0.57%
3 - Total number of residential accounts is from data provided by water agency for this project (see worksheet with account data in this file). Number of
Total Population from Census data 6 = 9,990 10047 Estimated employment growth from 2000 to 2001 (ABAG Employment Projections): 0.80%
multi-family accounts was obtained from data in the Urban Water Management Plan, 2000 (UWMP).
Subtract Institutionalized Population = 24 25 Water use for the institutionalized population is accounted for in nonresidential billing categories
4 - Total water Purchased (produced) taken from BAWUA for Fiscal Year 2001-2002.
Residential Population = 9,966 10,023 Residential population shown corresponds to the city or cities represented by Census data
Avg. HHS 7 = 2.56
5 - Unaccounted for Water (UFW) is the percent difference between the total water purchased and the total water use.
MF Pop @ MF HHS 7 = 1.90 1,045 1,051 1,045 10.5% Percent of Population that is MF
SF Pop = 8,921 8,972 8,972 89.5% Percent of Population that is SF
6 - The portion of the South San Francisco population that is within the service area is assumed to be equal to the BAWUA 2000-2001 service area
SF HHS 7 = 2.67
population.
Total 10,017 100.0%
7 - Initial estimate based on census data for renter occupied units. However it was detemined that the household sizes in the Westborough area are smaller
27 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys
than the average for South San Francisco.
51 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population
2000 Census Data
Average household size 3.05 Estimate Service Area Dwelling Units for 2001
Average household size of owner-occupied unit 3.02 SF Res 3,359 Equals No. Buldings from cell M21 plus growth in accounts for one year from cell T38
Average household size of renter-occupied unit 3.11 MF Res 550 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) 0.70
Rental vacancy rate (percent) 1.30 Population and Employment Estimates Corresponding to Service Area
Population
Employment
8 - Unaccounted for water assumed equal to the 5-yr average from the BAWUA survey data if greater than 7%, otherwise a minimum of 7% was used.
9 - Based on information in the UWMP, it was assumed that 6 of the commercial accounts were multifamily residential (containing approx. 550 apartments)
and consumed 1/3 of the total water use for the commercial accounts. The total commercial accounts and water consumption reported by the agency were
adjusted accordingly.
2000 Census data for jurisdiction 9,990 NA
2000 ABAG (jurisdictional) 60,552 53,190
2005 ABAG Projection (jurisdictional) 62,600 55,330
2000 ABAG (subregional) 60,732 53,230
2005 ABAG Projection (subregional) 62,800 55,370
2000 Department of Finance Benchmark 60,552 From State of California Department of Finance (DOF) table E-4 as of 4-1-2000. Website www.dof.ca.gov
Data Prepared : July 23, 2003 By: N. Foged, J Hudson 2001 Department of Finance Estimate 60,900 From State of California Department of Finance table E-4 as of 1-1-2001. Website www.dof.ca.gov
Revised: September 5, 2003 2002 Department of Finance Estimate 60,800 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 9,990 NA
FY 2001-2002 BAWUA service area 9,990 NA
2001 Employment in Service Area (input to DSS Model) = 1,610 Assume 3% of South San Francisco 2000 ABAG subregional employment (escalated to 2001 using the
assumed growth rate in cell T39) is found in Westborough CWD commercial sectors
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