SFPUC Wholesale Customer Water Demand Projections ... - BAWSCA

City of Milpitas Water Service Area 1
DSS Input Sheet
FINAL INPUT SHEET
New SF Residential New Commercial
Single Family
Multifamily
Commercial
Industrial
Institutional, Schools, Government
Irrigation
Recycled
City Domestic Accounts
Base Year Average Use and Indoor Percentages by Billing Category for DSS Model 2
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 325 71% 827 91% 2,164 89% 6,818 87% 8114 92% 2,804 34% 507,677 0% 1,756 38% 500 46% 4,500 43%
Category 8 Accounts 2001 MGD Use Profile
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 City of Milpitas
2001 3 gpd/a 2 2001 Percent gcd gcd
Single Family 11,955 325 3.89 34.75% 87 62
Multifamily 1,445 827 1.20 10.69% 67 61
Service Area Billing Difference between
Commercial 555 2,164 1.20 10.73%
Accounts - Year 2000 billing and census
Industrial 354 6,818 2.41 21.55%
Single family
2000 Units
No. Buildings
3
data
Data Sources / Notes
Institutional, Schools 44 8,114 0.36 3.19% 1-detached 10,918 10,918
Irrigation 555 2,804 1.55 13.91% 1-attached 2,226 2,226
Recycled 1 507,677 0.51 4.54% Subtotal 13,144 13,144 11,940 1,022 Housing Characteristics from U.S. Census Bureau
City Domestic Accou 38 1,756 0.07 0.60% Multi family
New SF Residential 1 500 0.000500 0.0045% 2-units 178 89
New Commercial 1 4,500 0.004500 0.0402% 3-4 units 1,294 370
Total 14,947 11.18 100.00% 5 to 9 units 622 89
Total Water Purchased (produced) 4 = 11.52 MGD 10-19 units 543 36
Unaccounted For Water (UFW) 5 = 5.6% Percent From 5 year BAWUA Survey average 20 or more units 1,016 20
Meter for assumed 50 units per building.
Estimated UFW for DSS Model = 7% Percent 7% if actual is < 7%, otherwise = E25 mobile homes 550 11
Meter for mobile home parks, assume 50 per park.
Water Produced for use in DSS Model 11.96 MGD Add UFW to Total Water Use Subtotal 4,203 615 1,269 97 Must be more than one building on an MF meter.
Peaking Factor 1.9 Provided by Agency or SFPUC Water Master Plan (or NA) MF Average = 6.8 units/building 5 units/account Units inlude all multi-family dwellings plus the "1-attached" dwellings.
Peaking Factor for DSS Model = 1.9 If NA use default value of 1.6.
Total SF + MF units = 17,347
- Blue cells are entered by modeler
- Yellow cells are input to DSS Model Population and Household Size in Census 2000 forCity of Milpitas Estimated
Service Area
NOTES City of Milpitas City of Milpitas Residential
1. - Service area consists of the City of Milpitas according to BAWUA survey Census Population Estimated Population Population
Data Sources / Notes
2000 2001 2001 Estimated growth from 2000 to 2001 (CA DOF Projections): 0.64%
2 - Average water use for each category in gallons-per-day-per-account was determined by averaging the water sales over the 2001 calander year. Indoor
Total Population from Census data 6 = 62,698 63100 Estimated employment growth from 2000 to 2001 (ABAG Employment Projections): 1.21%
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.
Subtract Institutionalized Population = 3,116 3136 Water use for the institutionalized population is accounted for in nonresidential billing categories
Residential Population = 59,582 59,964 Residential population shown corresponds to the city or cities represented by Census data
3 - Number of accounts is from data provided by water agency for this project (see worksheet with account data in this file)
Avg. HHS 7 = 3.43
MF Pop @ MF HHS 7 = 2.45 10,297 10,363 17,929 17.3% Percent of Population that is MF
4 - Total Water Purchased (produced) taken from BAWUA for Fiscal Year 2001-2002. Input here for comparison.
SF Pop = 49,285 49,601 44,826 82.7% Percent of Population that is SF
SF HHS 7 = 3.75
5 - Unaccounted for Water (UFW) is the percent difference between the total water purchased and the total water use. The number input here is the 5-year
Total 62,756 100.0%
average of the UFW reported to BAWUA.
-4,144 Difference in our estimate and average of 2000-2001 and 2001-2002 BAWUA Surveys
6 - Total population for City of Milpitas obtained from 2000 Census. This number was escalated to 2001 using the California Department of Finance
-1,008 Difference in our estimate and the average 2000-2001 and 2001-2002 BAWUA Surveys including institutionalized population
growth projections and used as reference for determining the 2001 base year service area population. Additional population estimates provided at lower
right.
Estimate Service Area Dwelling Units for 2001
7 - Census data used to reconsile SF and MF population and dwelling units. An initial estimate of household size was made based on census data for owneroccupied
SF Res
11,955 Equals billing accounts in 2001 from cell C15
and renter-occupied units (SF and MF respectively). See table below for 2000 Census data for City of Milpitas.
MF Res
7,318 Equals billing accounts in 2001 from cell C16 times average units per account in cell
N30
2000 Census Data Population and Employment Estimates Corresponding to Service Area
Average household size 3.47 Population Employment
Average household size of owner-occupied unit 3.49 2000 Census data for jurisdiction 62,698 NA
Average household size of renter-occupied unit 3.44 2000 ABAG (jurisdictional) 62,698 50,280
Homeowner vacancy rate (percent) 0.40 2005 ABAG Projection (jurisdictional) 68,300 53,310
Rental vacancy rate (percent) 2.10 2000 ABAG (subregional) 62,810 50,280
8 - New single family residential accounts input as a separate category to allow for a higher average rate of water usage. It was assumed that these
accounts use approximately 50% more water than existing accounts (all of which is allocated to outdoor use).
9 - New commercial accounts input as a separate category to allow for a higher average rate of water usage. It was assumed that these accounts use
approximately 100% more water than existing accounts (all of which is allocated to outdoor use).
10 - The Ed Levin Park account is included under the City Domestic Accounts category.
11 - Recycled Water Category included based on numbers received from the City of Milpitas (May 14, 2004.)
The Irrigation water usage is potable only.
2005 ABAG Projection (subregional) 68,400 53,310
2000 Department of Finance Benchmark 62,698 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 63,100 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 63,700 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 66,000 NA
FY 2001-2002 BAWUA service area 67,800 NA
2001 Employment in Service Area (input to DSS Model) = 53,566 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)
Definitions / Abbreviations
Data Prepared : July 23, 2003 By: N. Foged ABAG Association of Bay Area Governments MF multi family
Revised: May 27, 2004 By: N. Foged 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