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Stream Depletion by Ground Water Pumping

Stream Depletion by Ground Water Pumping. Garey A. Fox and Michael A. Kizer Associate Professor and Professor Oklahoma State University. Water Research Advisory Board Meeting, July 22, 2010 Cowboy and Western Heritage Museum, Oklahoma City, OK. Streams and Alluvial Aquifers

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Stream Depletion by Ground Water Pumping

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  1. Stream Depletion by Ground Water Pumping Garey A. Fox and Michael A. Kizer Associate Professor and Professor Oklahoma State University Water Research Advisory Board Meeting, July 22, 2010 Cowboy and Western Heritage Museum, Oklahoma City, OK

  2. Streams and Alluvial Aquifers Hydraulically connected – a single resource Ground water pumping adjacent to rivers depletes streamflow (“alluvial well depletion”) Research Question: Is alluvial well depletion significant in OK rivers? Critical Water Issue Stream Leakage into the Alluvial Aquifer

  3. Controlling Factors • Aquifer Properties: • T (or K), Sy • Pumping Well: • L, Q • Stream: • Ksb • Penetration Idealizations of Alluvial Well Pumping Adjacent to a Stream

  4. Study Sites North Canadian River Washita River

  5. Determine typical hydrogeologic cross-sections and aquifer parameters Measure local and reach-scale streambed conductivity Conduct long-term monitoring of stream/ground water levels and stream/aquifer analysis tests (4) Develop a stream depletion worksheet for estimating alluvial well depletion Objectives/Tasks North Canadian River Washita River

  6. Field Site #1: North Canadian River

  7. Hydrogeologic Cross-Sections: Field Site #1: North Canadian River ACOG: Electrical resistivity survey Schoff and Reed (1951): T = 870 m2/d Ryder (1996): Sy = 0.29 K = 48 m/d

  8. Streambed conductivity (Ksb) measurements at site: Empirical equations from grain-size distribution Field Site #1: North Canadian River

  9. Streambed conductivity (Ksb) measurements at site: Falling-head permeameter tests: Field Site #1: North Canadian River

  10. Reach-scale streambed conductivity (Ksb) measurements: Field Site #1: North Canadian River

  11. Field Site #1: North Canadian River • Stream-Aquifer Analysis Test… • Extract ground water and measure drawdown • Use analytical solution(s) to determine aquifer and streambed parameters • Use parameters to quantify stream depletion

  12. Field Site #1: North Canadian River

  13. Field Site #1: North Canadian River

  14. Field Site #1: North Canadian River 5 days

  15. Field Site #2: Washita River

  16. Hydrogeologic Cross-Sections: Field Site #2: Washita River • Kent (1978): • 12 to 30 m thick • T = 100 to 400 m2/d • Sy = 0.30

  17. Streambed conductivity (Ksb) measurements at site Empirical equations from grain-size distribution: Field Site #2: Washita River

  18. Streambed conductivity (Ksb) measurements at site Falling-head permeameter tests: Field Site #2: Washita River

  19. Reach-scale streambed conductivity (Ksb) measurements: Field Site #2: Washita River

  20. Field Site #2: Washita River

  21. Field Site #2: Washita River

  22. Field Site #2: Washita River 5 days

  23. Both rivers mimic fully penetrating streams with little to no hydraulic resistance by a streambed layer Streambed conductivity similar to aquifer conductivity Easier solutions for estimating stream depletion High stream depletion in wells located near the rivers Solutions used to develop an Oklahoma Stream Depletion Factor (OSDF) worksheet Primary Findings

  24. Questions?E-mail: garey.fox@okstate.eduResearch Website: http://biosystems.okstate.edu/Home/gareyf

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