Hydrogeology and Groundwater Quality of Highlands ... - USGS

More documents

Recommendations

Info

20 Hydrogeology and Groundwater Quality of Highlands County, Florida 27°30’ 27°15’ 27°00’ HARDEE COUNTY Hydrogeology DESOTO COUNTY CHARLOTTE COUNTY Avon Park POLK COUNTY GLADES COUNTY Figure 14. Location of sinkholes and depressions in Highlands County. The hydrogeologic system in Highlands County consists of a thick sequence of sedimentary rocks that include sands, clays, and carbonates. These lithostratigraphic units form a multilayered sequence of aquifers and confining units. Three hydrogeologic units present in Highlands County, in order of increasing depth, are the surficial aquifer, the intermediate aquifer system/intermediate confining unit (IAS/ICU), and the Floridan aquifer system. The surficial aquifer is the uppermost water-bearing unit and underlies all of Highlands County. The IAS/ICU, which contains sediments of lower permeability, restricts the movement of water between the overlying 81°30’ 81°15’ 81°00’ Sebring Kuhlman Venus Base modified from U.S. Geological Survey digital data, 1:100,000, 1985 Albers NAD projection 1983 Lake Placid HIGHLANDS COUNTY Lake Istokpoga Lorida 0 0 Kissimmee River Brighton Cornwell OSCEOLA COUNTY OKEECHOBEE COUNTY EXPLANATION SINKHOLE OR DEPRESSION FEATURE–Features were delineated from 1:24,000 U.S. Geological Survey topographic maps LAKE STREAM 5 10MILES 5 10KILOMETERS and underlying aquifers. The Floridan aquifer system consists of the Upper Floridan aquifer and Lower Floridan aquifer, which are separated by less-permeable middle confining units I, II, and/or VI (Miller, 1986). The base of the Floridan aquifer system is marked by low-permeability limestone and dolostone that contain considerable gypsum and anhydrite of the upper Cedar Keys Formation. Variations in the distribution, thickness, and dip of the hydrogeologic units based on geophysical and geologic logs (locations shown in fig. 15) are depicted in three generalized hydrogeologic sections shown in figures 16 and 17. Stratigraphic units, general lithology, and corresponding hydrogeologic units underlying Highlands County are shown in figure 12.
27°30’ 27°15’ 27°00’ Surficial Aquifer ROMP 43 A HARDEE COUNTY DESOTO COUNTY B ROMP 13 CHARLOTTE COUNTY Avon Park W-9285 Figure 15. Location of hydrogeologic sections. The sediments that compose the surficial aquifer range from Pliocene to Holocene in age and are contiguous with land surface. Groundwater in the surficial aquifer is under unconfined or water-table conditions. The surficial aquifer is composed primarily of fine-to-medium grained quartz sand that grades with depth to silty and clayey sands. In this study, the base of the surficial aquifer is defined as the first persistent bed of Pliocene-age sediments containing a substantial increase in clay or silt. The hydrogeologic term, “surficial aquifer system” is generally used in referring to this aquifer in Florida (Southeastern Geological Society Ad Hoc Committee on Hydrostratigraphic Unit Definition, 1986). However, 81°30’ 81°15’ 81°00’ 27 98 POLK COUNTY C ROMP 43xx ROMP 28 W-2397 W-2859 W-9298 ROMP 29A Sebring Kuhlman 17 Archbold Biological Station ROMP 14 Venus W-5132 Base modified from U.S. Geological Survey digital data, 1:100,000, 1985 Albers NAD projection 1983 SFWMD S-2 HIGHLANDS COUNTY 27 GLADES COUNTY Lake Istokpoga Lake Placid ROMP 28x C’ A’ 70 Lorida 98 Smoak Groves 0 0 Kissimmee ROMP 43 A A’ River Brighton Cornwell W-11421 EXPLANATION OSCEOLA COUNTY OKEECHOBEE COUNTY WELL LOCATION AND NAME LINE OF HYDROGEOLOGIC SECTION 5 10MILES 5 10KILOMETERS Hydrogeology 21 HIF-42 because in Highlands County there is just one permeable unit and no confining unit present, the term “surficial aquifer” is used here. This aquifer has also been referred to as “water table aquifer” or “nonartesian aquifer” in earlier reports. A generalized contour map of the thickness of the surficial aquifer in Highlands County is shown in figure 18, which includes both saturated and unsaturated undifferentiated sediments. The thickness of the surficial aquifer is highly variable, ranging from less than 50 to more than 300 ft. In much of eastern, west-central, and extreme southwestern Highlands County, the thickness of the surficial aquifer generally ranges from about 50 to 100 ft. At a few locations within the county, however, the thicknesses of these sediments are less than 50 ft. B’
Page 1 and 2: Prepared in cooperation with Highla
Page 3 and 4: Hydrogeology and Groundwater Qualit
Page 5: Acknowledgments The author grateful
Page 8 and 9: vi Appendix 1. Inventory of wells u
Page 10 and 11: viii Conversion Factors Multiply By
Page 12 and 13: 2 Hydrogeology and Groundwater Qual
Page 20 and 21: 10 Hydrogeology and Groundwater Qua
Page 80 and 81:
70 Hydrogeology and Groundwater Qua
Page 82 and 83:
Appendix 1. Inventory of wells used
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Appendix 2. Summary of major inorga
Page 90 and 91:
Appendix 2. Summary of major inorga
Page 92 and 93:
Appendix 3. Summary of selected tra
Page 94 and 95:
Appendix 3. Summary of selected tra
show all

Hydrogeology and Groundwater Quality of Highlands ... - USGS

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?