COMPREHENSIVE WATER SYSTEM PLAN | APPENDICES | WOODINVILLE WATER DISTRICT

FEBRUARY 2019

Appendix F DEMAND PROJECTIONS

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WOODINVILLE WATER DISTRICT

COMPREHENSIVE WATER SYSTEM PLAN

TECHNICAL MEMORANDUM NO. 1

DEMOGRAPHIC ANALYSIS

TABLE OF CONTENTS

Page No.

1.0 INTRODUCTION .................................................................................................... 1-1

2.0 JURISDICTIONS SERVED BY THE DISTRICT ..................................................... 1-1

3.0 LAND USE ............................................................................................................. 1-4

4.0 PUGET SOUND REGIONAL COUNCIL FORECASTS ......................................... 1-7

5.0 GROWTH RATES .................................................................................................. 1-8

6.0 WATER ACCOUNT PROJECTIONS ................................................................... 1-11

LIST OF TABLES Table 1.1 PSRC Land Use Vision Projections by Pressure Zone .................................. 1-7 Table 1.2 PSRC LUV Annual Growth Rates by Pressure Zone .................................... 1-9 Table 1.3 Reduced Annual Growth Rates by Pressure Zone ..................................... 1-10 Table 1.4 Historical Number of Accounts .................................................................... 1-12 Table 1.5 Projected Number of Accounts – PSRC Growth Scenario .......................... 1-13 Table 1.6 Projected Number of Accounts – Reduced Growth Scenario ...................... 1-13

LIST OF FIGURES Figure 1.1 District RWSA and City Boundaries .............................................................. 1-2 Figure 1.2 Water System Facilities and Pressure Zones ............................................... 1-3 Figure 1.3 Existing Land Use ......................................................................................... 1-5 Figure 1.4 Future Land Use ........................................................................................... 1-6 Figure 1.5 Account Projections by Customer Type ...................................................... 1-14

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Technical Memorandum No. 1

DEMOGRAPHIC ANALYSIS

1.0 INTRODUCTION This technical memorandum (TM) presents the demographic analysis performed for the purpose of estimating the number and type of future water customers served by the Woodinville Water District (District). This demographic analysis is the basis for estimating future water demands within the District's retail water service area (RWSA) for the District's Comprehensive Water System Plan Update (Plan). As such, it is a critical component to understanding future infrastructure needs of the water system. Figure 1.1 presents the District's RWSA boundary.

According to Puget Sound Regional Council (PRSC) estimates, the District currently serves a population of approximately 48,000 in addition to 22,000 employees. The demographic projections presented in this memorandum were provided by the PSRC's Land Use Vision (LUV) dataset and customized for each of the District's pressure zones. A map showing the water system pressure zones is presented in Figure 1.2.

Overall, the LUV dataset forecasts 0.9 percent annual residential growth and 1.3 percent annual employment growth within the District's RWSA through 2040. The District anticipates that growth of its number of water accounts may be less than predicted by the PSRC LUV dataset. Therefore, the District also developed a Reduced Growth Scenario that decreases the PSRC LUV growth rates by 25 percent resulting in 0.6 percent annual residential growth and 1.0 percent annual employment growth.

High, medium, and low water demand projection scenarios will be developed for the District's Plan. The PSRC LUV Growth Scenario will be used for the high demand projections and the Reduced Growth Scenario will be used for the medium and low demand projections. System analyses will be performed for the District's supply, pumping, storage, and distribution system using the medium demand projection scenario.

2.0 JURISDICTIONS SERVED BY THE DISTRICT The District serves customers of multiple jurisdictions within its boundary including:

• City of Woodinville • City of Bothell • City of Kirkland • City of Redmond • Unincorporated King County • Unincorporated Snohomish County

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DISTRICT RWSA ANDCITY BOUNDARIES

FIGURE 1.1

WOODINVILLE WATER DISTRICTCOMPREHENSIVE WATER SYSTEM PLAN

TM 1 – DEMOGRAPHIC ANALYSIS0 1 20.5Miles

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LegendWWD RWSA

Parcels

Water Body

Major Highways

County Boundary

Unincorporated King County

Unincorporated Snohomish County

CitiesBothell

Duvall

Kirkland

Redmond

Woodinville

Urban Growth BoundariesCity of Redmond

City of Woodinville