Polk County Water Providers Regional Water Supply Strategy Table of Contents
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Regional Water Supply Strategy Final Report January 2005 Presented to: Polk County W ater Providers Prepared by: 111 SW Fifth Avenue, Suite 1670 Portland, regon 97204 (503) 223-3033 Acknowledgments The individuals listed below volunteered there time and knowledge to aid in the development of this document. The Polk County Community Development Department thanks the members of the Technical Advisory Committee, Agency Participants, and County Commissioners for their efforts. POLK COUNTY TECHNCIAL ADVISORY COMMITTEE Committee Members Ralph Blanchard, Chair, Tanglewood Area Ray Hobson, Vice Chair, Perrydale Water Howard Pope, Luckiamute Water and interested public Jay Lugenbill, Rickreall Water Mel Wheeler, Rock Creek Water Karl Ekstrom, Grand Ronde Water Gary Wilson, Monmouth Russ Cooper, Monmouth Fred Braun, Dallas Mike Danko, Independence Jim Minard, City of Adair Village Eric Scott, Confederated Tribes of Grand Ronde Mark Lyons, Buell-Red Prairie Water Ginger Lindekugel, Falls City Other Agency participants Bill Fujii, Water Resources Department Jackie Hastings and Jill Elliott, Polk Soil and Water Conservation District Deborah Topp, Rickreall Watershed Council Jeff Hecksel, City Manager, Monmouth Greg Ellis, City Manager, Independence Roger Jordan, City Manager, Dallas Polk County Commissioners Mike Propes Phil Walker Tom Ritchey Ron Dodge Prepared by HDR/EES Randy Goff Wade Hathhorn, Ph.D., P.E. Ryan Beaver, P.E. Donna Strahm Betsy Leatham Acknowledgements i Polk County Water Providers Regional Water Supply Strategy Table of Contents Section 1 – Executive Summary 1.1 Objectives.........................................................................................................................1-1 1.2 Overview..........................................................................................................................1-1 1.3 Projected Water Supply Deficiencies ..............................................................................1-2 1.4 Supply Strategies..............................................................................................................1-5 1.5 Phased Capital Plans ........................................................................................................1-7 1.6 Wholesale Rate Estimates................................................................................................1-8 1.7 Administrative Options..................................................................................................1-10 1.8 Next Steps ......................................................................................................................1-11 Section 2 – Background Information 2.1 Introduction......................................................................................................................2-1 2.2 Study Objectives ..............................................................................................................2-2 2.3 General Approach............................................................................................................2-2 2.3.1 Analysis of Water Supply Alternatives................................................................2-2 2.3.2 Refinement of Selected Alternatives....................................................................2-4 Section 3 – Regional Demand for Water 3.1 Introduction......................................................................................................................3-1 3.2 Regional Population Projections ......................................................................................3-1 3.3 Summary of Present Water Use.......................................................................................3-3 3.4 Water Demand Projections ..............................................................................................3-5 3.5 Distribution of Regional Demand ....................................................................................3-6 Section 4 – Future Needs Analysis 4.1 Introduction......................................................................................................................4-1 4.2 Summary of Existing Water Rights .................................................................................4-1 4.2.1 General Access to Supplies..................................................................................4-1 4.2.2 City of Adair Village Water Rights .....................................................................4-2 4.3 Available Water Supplies.................................................................................................4-3 4.4 Regional Water Supply Deficiencies ...............................................................................4-5 4.5 Geographical Distribution of Need..................................................................................4-7 4.6 Distribution of Regional Demand ....................................................................................4-7 Table of Contents i Polk County Water Providers Regional Water Supply Strategy Table of Contents Section 5 – Supply Strategies 5.1 Introduction......................................................................................................................5-1 5.2 Water Supply Alternatives...............................................................................................5-1 5.2.1 General Water Supply Conditions .......................................................................5-1 5.2.2 Willamette River..................................................................................................5-2 5.2.3 Surface Water Storage .........................................................................................5-5 5.2.4 Groundwater.........................................................................................................5-6 5.2.5 Conservation and Reuse.......................................................................................5-6 5.2.6 Other Options .......................................................................................................5-9 5.3 Select Evaluation Criteria ................................................................................................5-9 5.4 Comparison of Supply Alternatives...............................................................................5-12 5.4.1 Comparative Analysis........................................................................................5-12 5.4.2 Summary of Cost Estimates...............................................................................5-16 5.5 Other Considerations......................................................................................................5-17 Section 6 – Phased Capital Plan and Pre-Design 6.1 Introduction......................................................................................................................6-1 6.2 Incremental Supply Plan..................................................................................................6-1 6.3 Alternative WR-1 (Adair Village WTP)..........................................................................6-2 6.3.1 Treatment .............................................................................................................6-2 6.3.2 Raw Water Transmission.....................................................................................6-3 6.3.3 Finished Water Transmission..............................................................................6-3 6.3.4 Pumping ...............................................................................................................6-4 6.3.5 Storage .................................................................................................................6-5 6.3.6 Phased Capital Plan..............................................................................................6-5 6.4 Alternative WR-2 (Regional WTP) .................................................................................6-7 6.4.1 Treatment .............................................................................................................6-7 6.4.2 Raw Water Transmission.....................................................................................6-8 6.4.3 Finished Water Transmission..............................................................................6-9 6.4.4 Pumping ...............................................................................................................6-9 6.4.5 Storage ...............................................................................................................6-10 6.4.6 Phased Capital Plan............................................................................................6-10 6.5 Distribution to Area Water Providers ............................................................................6-12 6.5.1 Description.........................................................................................................6-12 6.5.2 Summary............................................................................................................6-16 Table of Contents ii Polk County Water Providers Regional Water Supply Strategy Table of Contents Section 7 – Wholesale Rate Estimate 7.1 Introduction......................................................................................................................7-1 7.2 Overview of the Rate Study Process................................................................................7-1 7.3 Global Principles around which