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Hydrology of the Floridan Aquifer System . in West-Central Florida

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Hydrology of the Floridan Aquifer System . in West-Central Florida HYDROLOGY OF THE FLORIDAN AQUIFER SYSTEM _. IN WEST-CENTRAL FLORIDA U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER Hydrology of the Floridan Aquifer System in West-Central Florida By PAUL D. RYDER REGIONAL AQUIFER-SYSTEM ANALYSIS U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1403-F UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1985 UNITED STATES DEPARTMENT OF THE INTERIOR Donald Paul Hodel, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Library of Congress Cataloging in Publication Data Ryder, Paul D. Hydrology of the Floridan aquifer system in west-central Florida. (Geological Survey Professional Paper ; 1403-F) Bibliography: p. F60-F63 Supt. of Docs. No.: I 19.16:1403-F 1. Water, Underground Florida. 2. Aquifers Florida. I. Title. II. Series. QB1025.F6R93 1985 551.49 85-600254 For sale by the Branch of Distribution U.S. Geological Survey 604 South Pickett Street Alexandria, VA 22304 FOREWORD THE REGIONAL AQUIFER-SYSTEM ANALYSIS PROGRAM The Regional Aquifer-System Analysis (RASA) program was started in 1978 after a congressional mandate to develop quantitative appraisals of the major ground-water systems of the United States. The RASA program represents a systematic effort to study a number of the Nation's most important aquifer systems, which, in aggregate, underlie much of the country and which represent important components of the Nation's total water supply. In general, the boun­ daries of these studies are identified by the hydrologic extent of each system, and accordingly transcend the political subdivisions to which investigations often have been arbitrarily limited in the past. The broad objectives for each study are to assemble geologic, hydrologic, and geochemical information; to analyze and develop an understanding of the system; and to develop predictive capabilities that will contribute to the effective management of the system. The use of computer simulation is an important element of the RASA studies, to develop an understanding of the natural, undisturbed hydrologic system and of any changes brought about by human activities, as well as to provide a means of predicting the regional effects of future pumping or other stresses. The final interpretive results of the RASA program are presented in a series of U.S. Geological Survey professional papers that describe the geology, hy­ drology, and geochemistry of each regional aquifer system. Each study within the RASA program is assigned a single professional paper number. Where the volume of interpretive material warrants, separate topical chapters that consider the principal elements of the investigation may be published. The series of RASA interpretive reports begins with Professional Paper 1400 and will continue in numerical sequence as the interpretive products of studies become available. Dallas L. Peck Director in CONTENTS Page Page Abstract . ... ...... ....... F 1 Regional flow system Continued Introduction . ...... ... ..... ... ... 1 Steady-state flow conditions for 1976 Continued Floridan aquifer system regional study ............ 1 Pumpage . ..... .... ........ .... F38 West-central Florida subregional study . ..... .... 3 Changes in flow system, predevelopment to 1976 . 44 Purpose and scope .... ...... .... 3 Summary of flow components, predevelopment Description of the area . ......... ........ 3 and 1976 ... .. .... ... ..... .... 44 Previous investigations ..... .... ... ... 5 Ground-water development and potential. .... 44 Hydrogeologic framework and hydraulic properties ....... 5 History of development and hydrologic effects in Floridan aquifer system......... ... .... ... 5 selected areas ..... ....... ... .... ... 46 Intermediate aquifer and confining beds ...... 10 Municipal well fields north of Tampa Bay ....... 46 Surficial aquifer .... .... ... .... ..... .... 19 Heavily stressed upper Peace and upper Alafia Chemistry of water in the Floridan aquifer system. 19 River basins ... ...... ... ...... 46 Thickness of potable water ........ ..... 19 Connector-well recharge and waste injection ... 49 Dissolved-solids concentration .............. ... 21 Connector wells at Kingsford Mine area ..... 49 Saltwater-freshwater interface. .... ........ 21 Waste injection in Pinellas County .... .... 49 Regional flow system .... ....... ...... ... 21 Potential for development .... .... ... ........ 50 Predevelopment steady-state flow system .......... 24 Water-demand problem areas and water-supply Conceptual model of system . ... ....... 24 areas . ....... ... ... ..... ..... 50 Recharge and upward leakage . .... ... 27 Simulation of increased development .......... 53 Spring discharge ......... ... .... ... 29 Digital model of 1976 flow system ..... ... .... 54 Summary of flow components . .... ... ... 29 1976 steady-state calibration ...... .......... ... 54 Long-term changes in regional flow system. ..... 29 Procedure . ... ... .... ......... 54 Areas with negligible ground-water Hydrologic input data ..... .............. 54 development ... .... .... ... .... 29 Potentiometric surface .... ........ 54 Areas with substantial ground-water development Pumpage ... .... ......... .... .... 55 causing moderate, local water-level declines . 31 Boundary conditions ..... ... .... 55 Areas with substantial ground-water development Results . ....... ...... ............... 55 causing large, regional declines . .... ..... 34 May to September 1976 transient simulations and Steady-state flow conditions for 1976 ......... ... 37 sensitivity analysis .... ... ........ .... 55 Recharge and upward leakage . .... ..... 38 Summary and conclusions . .................. ..... 58 Spring discharge . ... ... ...... 38 Selected references ........ .... ......... ..... 60 ILLUSTRATIONS Page PLATE 1. Maps showing transmissivity and recharge and discharge rates for the Upper Floridan aquifer, and change in the potentiometric surface in response to simulated pumpage in west-central Florida ............ In pocket FIGURE 1-3. Maps showing: 1. Locations of subregional project areas with professional-paper chapter designation .................. F 2 2. Location of study area ........................ ................ ......... .......... 4 3. Locations of geologic sections and area where the Upper Floridan aquifer is at or near land surface ...... 8 4. Geologic section A-A'........ ..... ... ..... ............... .......... ................... 9 5. Geologic section B-B' ............... .... .... ..................... ..... ................. 10 6. Geologic section C-C". .................................... ..... .............. .......... 11 7. Geologic section D-D' .... ....................... ......... ..................... .......... 12 8-17. Maps showing: 8. Altitude of the top of the highly permeable dolomite zone of the Upper Floridan aquifer . ........... 13 9. Altitude of the top of the Upper Floridan aquifer........... ......... .... ........... ...... 14 10. Thickness of the Upper Floridan aquifer. ...... ...... ..................................... 15 11. Thickness and field and model-derived leakance of lowermost intermediate confining bed .............. 16 12. Thickness of the permeable deposits of the intermediate aquifer ................................. 17 13. Field and model-derived transmissivity of the permeable deposits of the intermediate aquifer ......... 18 VI CONTENTS Page FIGURE 14. Thickness and model-derived leakance of uppermost intermediate confining bed ................ ... F20 15. Dissolved-solids concentration in water from the Upper Florida aquifer ... ..... ................. 22 16. Saltwater-freshwater transition zone in the highly permeable dolomite of the Upper Florida aquifer...... 23 17. Estimated potentiometric surface of the Upper Floridan aquifer prior o development ...... .......... 25 18. Generalized hydrogeologic section along column 40 showing steady-state flow .................... ... 26 19. Generalized hydrogeologic section along column 13 showing steady-state flow . ..... ... ............... 27 20. Generalized hydrogeologic section along row 20 showing steady-state flow nearly perpendicular to flow lines ..... 28 21-22. Maps showing: 21. Locations of spring that discharge from the Upper Florida aquifer . ... ....................... 30 22. Locations of selected springs, observation wells, lake-stage stations, and precipitation stations . ....... 32 23-26. Graphs showing: 23. Ground-water levels, spring discharge, and rainfall data for Chassahowitzka Springs area ............. 33 24. Annual rainfall at Ocala and discharge at Silver Springs, 1951-80 ................... ........... 34 25. Ground-water levels, pumpage, and rainfall data for area north of Tampa Bay ....... ..... ... .... 35 26. Lake stages, ground-water levels, and rainfall data for Polk County area .... ..................... 36 27. Profiles of the potentiometric surface of the Upper Floridan aquifer across Polk County ............. ... 38 28-34. Maps showing: 28. Potentiometric surface of the Upper Floridan aquifer, 1976 ..... ... ... .... ................ 39 29. Pumpage, by county, from the Upper Floridan aquifer and intermediate aquifer, 1976 ... .......... 41 30. Simulated pumpage from the Upper Floridan aquifer, 1976 ..... ............... ............... 42 31. Simulated pumpage from the intermediate aquifer, 1976 ...... ... ................ .......... 43 32. Change of potentiometric surface of the Upper Floridan aquifer, predevelopment to 1976 .............. 45 33. Municipal well fields north of Tampa Bay. ................ ... .... ................ ... 47 34. Heavily
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