LINCOLN COUNTY PASSIVE REHYDRATION FEASIBILITY STUDY

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LINCOLN COUNTYPASSIVE REHYDRATION FEASIBILITY
STUDY

• LINCOLN COUNTY CONSERVATION DISTRICT
• Lake Roosevelt Forum
• April 13th, 2009
• Presented by Gene St.Godard

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GOAL

• To assess the feasibility of rehydrating the
  Columbia River Basalt (CRB) Aquifers in southern
  Lincoln County and the Odessa area by diverting
  available Columbia River water to the headwaters
  of Crab Creek and/or its tributaries in a manner
  that will benefit all water users in the area, by
  attempting to recharge 2/3 into groundwater and
  1/3 toward instream uses

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THE THEORETICAL SOLUTION

• Passive Rehydration/Recharge to Crab Creek
• Has been offered as a potential solution to
  declining stream flows and groundwater tables
  many times in the past.
• First talked about approximately 100 years ago by
  conveying water from Pend Oreille County
• However, a detailed feasibility analysis has
  never been conducted.
• A preliminary analysis of water quality in the
  Lake Creek Drainage for recharge of Wastewater
  from Spokane

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Who Will Benefit?

• Deep Well Irrigators in the Odessa Area
• Municipalities (e.g. Warden, Moses Lake,
  Othello, Connell, and others.....)
• Domestic Groundwater Users
• Instream Flows
• Habitat (rehydrated streams and lakes)
• Recreational Users
• Economy of eastern Washington

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THE PROBLEM

• Dropping Water Table

190 in 27 yrs 7 ft/yr
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THE PROBLEM

• Decreasing Stream Flows

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THE PROBLEM

• Lakes Drying Up

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THE CONCEPTUAL MODEL
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THE CONCEPTUAL MODEL
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TASK 1DEVELOP WORK PLAN

• Task 1 Develop Work Plan/QAPP
• Work with Ecology and stakeholders to define
  agreed upon scope, schedule and milestones

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TASK 2PUBLIC OUTREACH

• Task 2 Public Outreach
• Land Position Survey
• Establish land use agreements
• Hold Public Meetings to get input from
  stakeholders

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TASK 3PREFEASIBILITY ANALYSIS

• Task 3 Prefeasibility Analysis (All of Lincoln
  County Northern Adams)
• Review and Determine Estimate of Potential Survey
  from GWMA Hydrostratigraphic Results (Detailed
  Hydrogeology Evaluation)
• Develop Conceptual Model
• Water Right Acquisition Survey
• Governance and Management Evaluation
• Public/Private Benefit Analysis
• GIS Screening
• Soils Survey
• Land Ownership
• Geology (bedrock and structural)
• Geology/Hydrogeology Viability
• Engineering Viability Analysis
• Surface Water/Groundwater Distribution Viability
  (1/3 v. 2/3 Analysis)
• Field Survey of Drainages
• Recommendation of Priority Drainages

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Task 4PILOT PROJECT

• Task 4 Pilot Project
• Get Temporary Water Right for Pilot Project (10
  cfs, 1 or 2 years?)
• Get Property Agreements
• Construction of Pump and Delivery System
• Operation and Maintenance of System

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Task 5FEASIBILITY ANALYSIS

• Task 5 Feasibility Analysis (Conducted on 1 to 3
  Priority Drainages in addition to Pilot Project)
• Field Data Collection and Monitoring
• Collection of Groundwater Data
• Collection of Stream Flow Measurements
• Aquifer Testing (if required)
• Field Characterization of Surface Soils
• Infiltration Tests
• Land Ownership Agreements

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Task 6PRELIMINARY ENGINEERING DESIGN

• Task 6 Preliminary Engineering Design
• Construction Analysis
• Cost Analysis

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Task 7REPORT PREPARATION

• Task 7 Report Preparation
• Environmental Impacts
• Determination of Quantity to Store and Where
• Determination of Rate of Storage
• Feasibility of Physiographic Constraints
• Benefits
• Conclusions and Recommendations

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BUDGET
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COST BENEFIT SOLEY FOR PILOT PROJET

• Pilot Project for one year _at_ 10 cfs
  1,200/acre-foot
• Pilot Project for two year _at_ 10 cfs
  600/acre-foot
• Cost per acre-foot recharged to instream and
  out-of-stream uses will proportionately decrease
  with higher cfs and time.

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VISION

• To develop a viable and cost effective means of
  rehydrating the surface water and CRB aquifers in
  the Odessa Subarea
• Conduct a project that will assist in mitigating
  the declining water resources for multiple water
  users throughout the Columbia Basin
• Recharge at a minimum of 300,000 acre-feet of
  water into the CRB aquifers
• To enhance the environmental and economic
  conditions within the Columbia Basin Region

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SUPPORTED BY MANY DIFFERENT ENTITIES

• WRIA 43 WRMG (Upper Crab Creek Watershed Plan)
• Rehydration is specifically outlined in their
  Watershed Plan
• Lincoln, Adams and Grant Counties added addendum
  to WRIA 43 Plan to address water storage and
  rehydration of Crab Creek
• Lincoln, Adams, Grant and Franklin County
  Commissioners
• Lincoln County Conservation District
• Columbia Basin GWMA
• Columbia Basin Development League
• Big Bend Resource Conservation Development
  League

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• THANK YOU!
• David Lundgren
• Lincoln County Conservation District
• Gene St.Godard, P.G., L.HG.

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