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Derek Winstanley Chief Illinois State Water Survey

This article discusses the current planning and management of water supplies in Illinois, the benefits and costs of water withdrawals, and key questions about managing available water supplies. It also highlights the importance of regional water supply planning and the need for long-term sustainable solutions.

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Derek Winstanley Chief Illinois State Water Survey

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  1. 2006 Governor’s Pollution Prevention AwardsBloomington, October 25, 2006WATER SUPPLY PLANNINGIN ILLINOIS Derek Winstanley Chief Illinois State Water Survey

  2. CONTENTS • Introduction • Current planning and management of water supplies • Executive Order 2006-01 • Benefits of water supply planning • Questions

  3. INTRODUCTION

  4. Fresh Water Use in Illinois2000 and 2025(mgd) Source:SIU

  5. THE WATER CYCLE:CLIMATE, SURFACE WATER, and GROUNDWATER ARE ALL LINKED

  6. 10-Year Running Averages Lak e Mic higan Watershed precipitation Illinois River streamflow at Meredosia/Valley City (minus Lake Michigan diversion) r e v 16 i 40 R r Groundwater elevation at Snicarte e v i i p R p s i i s o s n i i s l l 39 15 s I INDIANA Snicar te Mer edosia 38 14 V alle y City ILLINOIS 37 13 36 12 449.0 35 11 34 10 448.5 33 9 448.0 32 8 447.5 31 7 30 6 447.0 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 10-year running averages of Illinois River watershed precipitation, streamflow (minus Lake Michigan diversion), and groundwater elevation.

  7. BENEFITS Withdrawing water has benefits in supporting population growth and economic development COSTS Withdrawing water from rivers, lakes, reservoirs, and aquifers has costs. QUESTIONS What costs are we willing to accept in return for what benefits? How should we manage available water supplies? How should we deal with uncertainties and risks?

  8. KEY QUESTIONS: • How much water can be withdrawn safely from the aquifers and rivers and where? • How much growth can be sustained? • What will be the impacts of additional withdrawals on i) existing wells, ii) rivers and streams, and iii) the aquifers themselves? • How resistant to drought and possible climate change are water supplies?

  9. IllinoisWater Resources • Surface Water Intakes(public water supply) • Sand/gravel aquifers • Bedrock aquifers

  10. 0 4 8 12 16 20 MILES EAST-CENTRAL ILLINOIS Watseka WOODFORD CO Peoria NORTH Morton FORD CO Normal IROQUOIS CO Pekin Hoopeston Bloomington` Paxton TAZEWELL CO CHAMPAIGN CO VERMILION CO MCLEAN CO Havana Rantoul LOGAN CO MASON CO DEWITT CO Danville Champaign Clinton Urbana Lincoln MENARD CO PIATT CO CASS CO Monticello MACON CO Petersburg Decatur Springfield

  11. CURRENT MANAGEMENT OF WATER WITHDRAWALS • Private ownership of land, but not of water. • Need a permit to construct a pumping facility, but not to pump water. • DNR/OWR may place restrictions on surface water permits in order to protect public waters. • No limits to other withdrawals as long as they are for reasonable and beneficial use – Riparian Doctrine. • Courts settle conflicts. • 17 Water Authorities (13 in east-central Illinois). • Currently a fragmented water supply planning process - little comprehensive, regional water supply planning. • First come, first served. • No mandatory reporting of water withdrawals.

  12. GROUNDWATER WITHDRAWALS IN CHAMPAIGN COUNTY (mgd)

  13. WE NEED TO STUDY LONG-TERM CUMULATIVE IMPACTS OF WITHDRAWALS • Each additional withdrawal by itself may not have adverse impacts.

  14. CUMULATIVE IMPACTS WITH +10 MGD THRESHOLD • +2 mgd +4 mgd +6 mgd TOTAL +12 mgd

  15. MANAGEMENT STRATEGIES TO CONSIDER • LOCATION PRIORITIES ALLOCATION OF LIMITED ASSETS

  16. “WATER FOR ILLINOIS:A PLAN FOR ACTION”

  17. Executive Order 2006-01 for the Development ofState and Regional Water-Supply Plans • Issued by Governor on January 9, 2006 • Calls for: • Development of a scientific basis & administrative framework; • Locally-based regional water supply planning committees; • 3-year pilots, within existing laws, regulations, and property rights.

  18. PRIORITY AQUIFERS and WATERSHEDS for WATER SUPPLY PLANNING

  19. REGIONAL WATER SUPPLIES: PLANNING AND PLANS • Determine water availability using existing data, new data (climate change; geologic maps; water levels; hydraulic properties) and develop analytical tools (models). • Develop scenarios of water demand to 2050. • Evaluate management options, including water conservation and reuse. • Better able to answer questions posed. • Update state drought plan. • Cumulatively they can have adverse impacts

  20. C-U Savings & Loan Hospital/Insurance Coverage $80k C-U Savings & Loan DO NOT ENTER $80k Smith Family Jones Family

  21. BENEFITS OF REGIONAL WATER SUPPLY PLANNING • Achieve goals: “Provide adequate and reliable supplies of clean water at reasonable cost.” • Reduce conflicts • Provide basis for sustainable development

  22. ILLINOIS STATE WATER SURVEY http://www.sws.uiuc.edu dwinstan@uiuc.edu 217-244 5459

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