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Hydrogeologic Discussion of Southwest and Central Florida and Tie-In to the South Florida Area

Hydrogeologic Discussion of Southwest and Central Florida and Tie-In to the South Florida Area. Lester J. Williams 4/21/2011. Outline. Approach used for revising framework in central and southwest areas Discussion of the preliminary mapping Problem areas and things we need to discuss.

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Hydrogeologic Discussion of Southwest and Central Florida and Tie-In to the South Florida Area

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  1. Hydrogeologic Discussion of Southwest and Central Florida and Tie-In to the South Florida Area Lester J. Williams 4/21/2011

  2. Outline • Approach used for revising framework in central and southwest areas • Discussion of the preliminary mapping • Problem areas and things we need to discuss Finchs Cave, Marion Co. FL (A.M. Cressler)

  3. Approach • ROMP and deep exploratory well reports • Geophysical logs • Aquifers • Confining units • Transmissive zones • Aquifer Tests • Head Gradients • Cross Sections!!!

  4. Why Cross Sections? • Main reason is to enable us to build a 3D framework • Continuity of confining beds and permeability variations can be better understood • Very thick system with many different permeable zones and confining beds

  5. Preliminary Findings • Low-porosity beds comprising MCU I can be correlated into the eastern an southern part of SWFWMD; these include an upper thinner discontinuous zone and a lower thicker more continuous zone (informally designated as “MCU IA” and “MCU IB”) • MCU II is overlapped by MCU I along the eastern border and in the south areas of SWFWMD • MCU II consists of a very distinctive low porosity unit on geophysical logs, but is closely related and often confused with underlying MCU VI • Deeper MCUs also remapped and revised in area • Avon Park permeable zone forms on top of one or more of the following MCUs: MCU IA, MCU IB, MCU II

  6. Basis for all my interpretations next slide

  7. Reported “fractured zone” Duncan and others zones Pre-existing top markers Low-porosity unit interpreted from geophysical logs Water quality change

  8. Marked up log • Interpreted position of the confining units marked on logs • Other notations included • Then transferred to hand-drawn cross sections

  9. Relation of Stratigraphy to Aquifers and Confining Units • Original Scheme

  10. Top of MCU I Revised 4/2011 Miller, 1986 “MCU IA”

  11. Configuration of MCU I Revised 4/2011 Miller, 1986 “MCU IB” This area MCU III

  12. Old vs. New MCU IA MCU IB Green is Miller’s MCU I in both figures Brown is the top of MCU IA and MCUIB respectively

  13. MCU IB in SWFWMD Area Revised 4/2011

  14. Configuration of MCU II Revised 4/2011 Miller, 1986 MCU II

  15. MCUII Green is Miller’s MCU II Brown is the top of MCU II as revised 4/2011

  16. Problem Areas • Ocala Semi-Confiner • Avon Park Permeable zone • MCU VI • Proposed extension of this unit north • MCU VIII • Proposed extension of this unit north • Transmissive LF zones UF APPZ LF

  17. Summary • The middle confining units in central and southwest Florida have been revised from original framework • Changes proposed include: • Separate MCU I into two distinct units (IA & IB) • Slight changes to the extent of MCU II along its eastern edge • Deeper MCUs (VI) needs better definition • Include better definition of Avon Park Permeable zone using south Florida’s definition, it will be included in the Upper Floridan

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