SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

Los Trancos Woods
Northern, Blue Oaks, Vista Verde
Los Trancos 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
Year Average 9 , gpd/a Indoor Average 10 , 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 228 66% 567 26%
Number of
Data for DSS Model - - Base Year 2001
Water Use
Water Use, MGD
Category Accounts 2001
Use Profile
FY. 2001 3,8 gpd/a 2 2001 Percent gcd gcd
Los Trancos Wood 140 228 0.03 32.33% 43 28
Northern, Blue Oak 118 567 0.07 67.67% 91 24
0 0 0.00 0.00%
0 0 0.00 0.00%
Total Dwelling Units in Census 2000 for Portola Valley Town
Service Area Billing Difference
Single family
2000 Units
No. Buildings
2000 3 and census data
Accounts - Year between billing
0 0 0.00 0.00% 1-detached 1,510 1,510
0 0 0.00 0.00% 1-attached 34 34
0 0 0.00 0.00% Subtotal 1,544 1,544 265 -1,279
0 0 0.00 0.00% Multi family
Total 258 0.10 100.00% 2-units 0 0
Total Water Purchased (produced) 4 = 0.11 MGD 3-4 units 0 0
Unaccounted For Water (UFW) 5 = 6.6% Percent From 5 year BAWUA Survey average 5 to 9 units 84 12
Estimated UFW for DSS Model = 7.0% Percent 7% if actual is < 7%, otherwise = E25 10-19 units 97 6
Water Produced for use in DSS Model 0.106 MGD Add UFW to Total Water Use 20 or more units 84 2
Peaking Factor NA Provided by Agency or SFPUC Water Master Plan (or NA) mobile homes 0 0
Peaking Factor for DSS Model= 1.6 If NA use default value of 1.6. Subtotal 265 20 0 -20
MF Average = 13.15 units/building units/account
- Blue cells are entered by modeler
- Yellow cells are input to DSS Model Total SF + MF units = 1,809
NOTES
1. - Communities served are unincorporated area of Santa Clara and San Mateo Counties according to BAWUA survey
Population and Household Size in Census 2000 for Portola Valley Town Estimated
Residential
Portola Valley Town Portola Valley Town Service Area
Census Population Estimated Population Population
2 - Average water use water determined from the LTCWD Forecast Study (2002). The average water use per account in this study differs by 2% from the
average computed from billing data. Indoor use is based on the lowest month in the winter from monthly billing data.
3 - Number of accounts is based on the LTCWD Forecast Study (2002). 100% of the accounts are single family (SF) residential. Those accounts in the
Los Trancos Woods zone are in a separate category because the water usage is low than the rest of the service area.
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.
7 - No multi-family households are included in the service area. MF household size was assumed zero. SF household size was assumed to be 2.87 (similar
to nearby Town of Portola Valley).
Reconcile agency account billing data and census data
Data Sources / Notes
2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF Projections): 0.40%
Total Population from Census data 6 = 4,462 4480 Estimated employment growth from 2000 to 2001 (ABAG Employment Projections): 0.23%
Subtract Institutionalized Population = 36 36 Water use for the institutionalized population is accounted for in nonresidential billing categories
Residential Population = 4,426 4,444 Residential population shown corresponds to the city or cities represented by Census data
Avg. HHS 7 = 2.45
MF Pop @ MF HHS 7 0.00 0 0 0 0.0% Percent of Population that is MF
SF Pop = 4,426 4,444 740 100.0% Percent of Population that is SF
SF HHS 7 = 2.87
Total 740 100.0%
-515 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys
-479 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population
2000 Census Data
Average household size 2.58 Estimate Service Area Dwelling Units for 2001
Average household size of owner-occupied unit 2.75 SF Res 258 Equals billing accounts in 2001 from cell C15
Average household size of renter-occupied unit 1.67 MF Res 1,552 Equals billing accounts in 2001 from cell C16 times average units per building in cell L31
Homeowner vacancy rate (percent) 0.20
Rental vacancy rate (percent) 6.20 Population and Employment Estimates Corresponding to Service Area
Housing Characteristics from U.S. Census Bureau
Meter for assumed 50 units per building.
Meter for mobile home parks, assume 50 per park.
Data Sources / Notes
Population
Employment
2000 Census data for jurisdiction 4,462 NA
2000 ABAG (jurisdictional) 4,462 880
2005 ABAG Projection (jurisdictional) 4,800 890
2000 ABAG (subregional) 6,905 1,130
2005 ABAG Projection (subregional) 7,300 1,140
2000 Department of Finance Benchmark 4,462 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 4,480 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 4,490 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 1,250 NA
Data Prepared : July 24, 2003 By: N. Foged FY 2001-2002 BAWUA service area 1,260 NA
Revised: June 7, 2004 By: N. Foged 2001 Employment in Service Area (input to DSS Model) = 0 Assume that there is no service area employment because, "the District is and will remain into the future
as 100% single family residential." (LTCWD 2003).
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