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Benton County Water Analysis and Demand Forecast

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Benton County Water Analysis and Demand Forecast Phase 1: Benton County Water Analysis and Demand Forecast “Evaluating the quality and quantity of water resources for all uses, needs and users of Benton County, Oregon.” 2007-2008, All Rights Reserved Benton County Water Project FINAL DRAFT Published Materials Compiled and Referenced City of Adair Village, Water System Master Plan Update, 2008 City of Albany Water Management and Conservation Plan, 2006 City of Albany Hydraulic Modeling Update Plan, 2008 City of Corvallis Water Management and Conservation Plan, 2005 City of Monroe Water Management and Conservation Plan, April 2008 City of Philomath Water System Master Plan, 2005 Ground-Water Hydrology of the Willamette Basin, Oregon. By Terrence D. Conlon, Karl C. Wozniak, Douglas Woodcock, Nora B. Herrera, Bruce J. Fisher, David S. Morgan, Karl K. Lee, and Stephen R. Hinkle. Scientific Investigations Report 2005-5168. Prepared in cooperation with the Oregon Water Resources Department. Ground Water in the Corvallis-Albany Area, Central Willamette Valley, Oregon. F.J. Frank (1974). Geological Survey Water-Supply paper 2032. Oregon Department of Human Services- Drinking Water Program: • Safe Drinking Water Information System: http://170.104.158.45/ . • Community water system and Drinking Water Source Area information. Oregon Office of Economic Analysis- Demographic forecast: http://www.oea.das.state.or.us/DAS/OEA/demographic.shtml Oregon Water Resources Department: • Point of Diversion Summary Report: http://apps2.wrd.state.or.us/apps/wr/wrinfo/wr_summary_pod.aspx • Water Availability Reporting System- http://apps2.wrd.state.or.us/apps/wars/wars_display_wa_tables/water_availability_analysis.aspx. • Well Log Query- http://apps2.wrd.state.or.us/apps/gw/well_log/Default.aspx • Water Rights Query- http://apps2.wrd.state.or.us/apps/wr/wrinfo/ Southern Willamette Valley Groundwater Management Area Action Plan (2006). Southern Willamette Valley Groundwater Management Area Committee submitted report to Oregon Department of Environmental Quality; prepared by Lane Council of Governments. Scientific Consensus Statement on Likely Impacts of Climate Change on the Pacific Northwest, June 2004. Consensus paper drafted by Oregon State University researchers. Portland State University (PSU) - Population Research Center. 2000-2007 Population estimates: http://www.pdx.edu/prc/ . Compiled PSU and US Census population estimates from 1850-2000. Statistical summaries of streamflow data in Oregon: Volume 1 -- Monthly and annual streamflow, and flow- duration values, by R.L. Moffatt, R.E. Wellman, and J.M. Gordon. 1990. U.S. Geological Survey (USGS) Open-File Report 90-118. Willamette Basin Biological Opinion (July 11, 2008). National Oceanic and Atmospheric Administration- Marine Fisheries Service. http://www.nwr.noaa.gov/Salmon-Hydropower/Willamette- Basin/Willamette-BO.cfm Phase 1: Water Analysis and Demand Forecast 1 Benton County Water Project WDR OR-05-1 Water-Resources Data, Oregon, Water Year 2007, compiled by T.A. Herrett, M.A. Stewart, G.P. Ruppert, and M.L. Courts (includes water reports for Alsea, Long Tom, and Marys Rivers). Water Quantity Conversion Table Rates of Flow One (1) cubic foot per second (cfs) is a rate of water flow which will supply one cubic foot of water in one second and is equivalent to flow rates of: 7.48 gallons per second 448.8 gallons per minute 1 cfs = 646,272 gallons per day 1.98 acre-feet per day Volume Measurement One (1) acre-foot (af) is the volume of water which will cover one acre to a depth of one foot and is equal to: 43,560 cubic feet 1 af = 325,851 gallons Acknowledgements: Benton County thanks the organizations and individuals who supported the Phase 1 Water Project work. Special thanks are due to the members of the Steering Committee, Technical Team, and Outreach and Education Team. Benton County applauds the determination of the Oregon Water Resources Department and other state agency staff that continue to contribute positively to the planning and management of Oregon’s vital water resources into the future. 2 Phase 1: Water Analysis and Demand Forecast Benton County Water Project Table of Contents EXECUTIVE SUMMARY .............................................................................................. 9 Section 1 Objectives and Approach............................................................................... 13 Summary...................................................................................................................... 13 1.1 Purpose and Need ............................................................................................... 13 1.2 Overview of Approach: Phases I and II............................................................ 16 1.3 Project Objectives ............................................................................................... 17 1.4 Scope..................................................................................................................... 18 1.5 Contributors ......................................................................................................... 18 1.6 Steering Committee and Work Teams............................................................... 19 Section 2 Water Sources................................................................................................ 23 Summary...................................................................................................................... 23 2.1 Surface Water Sources.......................................................................................... 23 2.1.1 Willamette River ............................................................................................ 25 2.1.2 Long Tom River ............................................................................................. 25 2.1.3 Luckiamute River .......................................................................................... 26 2.1.4 Marys River................................................................................................... 27 2.1.5 Muddy Creek................................................................................................. 28 2.1.6 Alsea River..................................................................................................... 28 2.1.7 Rock Creek .................................................................................................... 29 2.2 Groundwater Sources......................................................................................... 30 2.2.1 Overview of Groundwater Conditions........................................................ 30 2.2.2 Younger Alluvium (QYAL) ......................................................................... 33 2.2.3 Older Alluvium (QOAL) .............................................................................. 35 2.2.4 Marine Sedimentary Rocks (TSS)............................................................... 35 2.2.5 Siletz River Volcanics (TSR)........................................................................ 36 2.3 Water Sources for Communities........................................................................... 37 2.3.1 City Water Sources ......................................................................................... 37 2.3.2 Non-Municipal Community Water Sources ................................................... 42 Section 3 Current Water Demand (Use)...................................................................... 45 Summary...................................................................................................................... 45 3.1 Surface Water Use .............................................................................................. 49 3.1.1 Existing Surface Water Rights, Excluding Instream Water Rights......... 49 3.1.2 Instream Water Rights................................................................................ 59 3.1.3 Water Rights for Storage ............................................................................. 61 3.2 Use of Groundwater............................................................................................ 67 3.2.1 Existing Groundwater Rights ...................................................................... 67 3.2.2 Estimate of Domestic and Non-Commercial (Exempt) Uses of Groundwater 69 3.2.3 Total Current Demand (Use) for Groundwater......................................... 72 3.3 Municipal Community Water Demands (Uses) ............................................... 74 3.3.1 Existing Municipal Community Water Use ............................................... 74 3.3.2 Descriptions of Current City Water Demand (Use) Estimates................. 76 3.4 Non-Municipal Community Water Demands (Use) ........................................ 79 Phase 1: Water Analysis and Demand Forecast 3 Benton County Water Project Section 4 Water Sources Reliability: Quality, Availability and Other Issues........... 81 Summary...................................................................................................................... 81 4.1 Surface Water...................................................................................................... 84 4.1.1 Water Availability and Basin Program Classification ............................... 84 4.1.2 Water Quality................................................................................................ 97 4.1.3 Fish Requirements ...................................................................................... 100 4.2 Groundwater Reliability ..................................................................................
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