Data Collection and Water Demand Factors

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Data Collection andWater Demand
Factors Presented to the Water Demand
ForecastAdvisory Committee
Central Puget Sound Water Suppliers Forum
August 16, 2007
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Data Collection Results
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Annual Projected Demographic Growth (2010 to
2060)
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Demographic Growth Summary

• Single-Family
• 0.3 to 1.4 King
• 1.4 to 2.3 Pierce
• 2.0 to 2.1 Snohomish
• Multifamily
• 1.7 to 3.3 King
• 2.8 to 4.0 Pierce
• 3.4 to 3.6 Snohomish
• Employment
• 1.0 to 1.8 King
• 1.7 to 2.5 Pierce
• 2.3 to 4.3 Snohomish

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Weather Stations for Study
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Normalized Temperature (1927-2004)
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Normalized Precipitation (1927-2004)
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Sub-Regional Water Use Factors
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Terminology
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Sectors, Drivers and Demographic Units
Sector Driver
Single-family SF Households
Multifamily MF Households
Non-residential Employment
Non-Revenue Water Population
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Methodology Overview Deriving Demographic and
Water Use Factor Inputs
PSRC projections by FAZ

• Survey Data
• SF accounts
• SF water use
• MF water use
• NR water use
• Total production consumption

• Demographic Data
• Population
• SF households
• MF households
• Employment

Provider Service Area Boundaries
Land Use Codes

• Add demographics by Subregion
• Average Water Use Factor by Subregion
• Average NRW by Subregion

Water Demand Model Utility Data (Input) - By
Provider
weighted average
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Water Demand Forecast Model
Control Panel
Demographic Projections
Utility Data
Provider Matrix
Non Revenue Water
Water Demand Forecast
Base Year Water Use Factors
Elasticities
Variable Values
Future Year Water Use Factors
Passive Conservation
Reports
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• Review of
• Preliminary (not weighted) average water use
  factors by sub-region
• (Weighted averages will be computed within model
  by sub-region)

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GPD SF water use / SF households Not weighted
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