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Balancing Water Supplies with Growing Demands

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  1. Balancing Water Supplies with Growing Demands Vic Kelson, Ph.D. Layne Hydro, a division of Layne Christensen Company

  2. Outline • Introduction • Water availability • Water demands • Water supply management • Engineered systems

  3. Introduction Why is water supply management necessary?

  4. Economic Development Impact • National • Southwest and southeast • Regional • Great Lakes • Local • Greensburg, Indiana

  5. Water AvailabilitySurface water & Groundwater Availability Annual/Seasonal Variation Water Quality Impacts

  6. Water Availability: Rivers, Streams, Reservoirs

  7. Water Availability:Groundwater Bedrock Aquifers Sand & Gravel Aquifers

  8. What factors limit water availability?

  9. Limits to Water Availability:Water Quality

  10. Limits Water Availability:Seasonal Variations & Drought

  11. Limits Water Availability: Other Factors • Groundwater withdrawals • Well interference • Wastewater assimilation • Recharge

  12. What factors increase water availability?

  13. Increases Water Availability • Water conservation • Water reuse • Graywater use • Nonpotable use • Aquifer recharge Light purple pipes distinguish a reclaimed water distribution system from a potable water distribution.

  14. Water Demand Total Water Use Water Use by County Future Demand

  15. Water Demand: Total Water Use

  16. Water Demand: Water Use by County

  17. Water Demand: Future Use • Fastest growing counties in U.S. & Indiana • Surface water supplies will be fully developed by 2020 (Malcolm Pirnie, 2005)

  18. Water Supply Management Approaches Individual Management Regional Planning Water Consortium Regionalization

  19. Water Management Examples • Individual Management • Central Indiana • Regional Planning • Twin Cities and Northeastern Illinois • Water Consortium • Cincinnati, Ohio • Regionalization • State of Florida Water Districts

  20. Engineered Systems It’s not only a planning problem

  21. Source of Supply • Conservation • Production and distribution efficiency • Enhanced recharge • In-ground storage, aquifer storage and recovery

  22. Conservation • End-user efficiency • Re-design our usage patterns optimize usage • Reuse and recycled water • Grey water systems? • Waste water for non-potable uses? • Infiltration or enhanced recharge for recycling?

  23. Efficiency • Optimize process designs for process efficiency • Think in terms of the entire operational life • Minimize energy costs • Reduce chemical feeds • Develop strategies for operational management • Improved SCADA • Distributed process control and optimization • Intelligent distribution systems?

  24. Induced recharge systems • Essentially, a re-engineered surface water intake • Improved reliability at low flow and in drought • Pre-treats surface waters by river bank filtration • Wellfield design is crucial • Optimize water-quality for the problem at hand • Implement operational plans

  25. Storage and ASR • Are gravel pits suitable for storage? • Design RBF systems for reliability, reduced risk? • Is ASR feasible? • Store water when demand is low • Pump water when demand is high • Economics?

  26. Questions? Thank You