29 30 ° ′

29 45 ° ′

82 45 ° ′ 82 30 ° ′

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY Prepared in cooperation with the

Suwannee River Water Management District

OPEN-FILE REPORT 2006-1031

Sepúlveda, A.A. and others, 2006, Potentiometric Surface of the Upper Floridan Aquifer in the

Ichetucknee Springshed and Vicinity, Northern Florida, September 2003

POTENTIOMETRIC SURFACE OF THE UPPER FLORIDAN AQUIFER IN THE

ICHETUCKNEE SPRINGSHED AND VICINITY, NORTHERN FLORIDA, SEPTEMBER 2003

By

A. Alejandro Sep lveda, Brian G. Katz, and Gary L. Mahon

2006

ú

Santa Fe River

Santa Fe

r

Rive

Ichetucknee River

Olus

e te

Creek

S

a

uw

nnee

Rive

r

Creek

Olu

s

e

te

SUWANNEE COUNTY COLUMBIA COUNTY BAKER COUNTY

HAMILTON

COUNTY

GILCHRIST COUNTY ALACHUA COUNTY

LAFAYETTE

COUNTY

UNION COUNTY

BRADFORD

COUNTY

27

247

129

27

47

47

41

441

41

441

100

90

10

75

10

75

121

18

18

121

22

18

38

16

20

24

26

28

30

32

16

18

20

22

26 24

28

30

32

32

34

36

40

42

44

46 48

50

52

54

56

58

54

58

56

56

54

52

50

48

46

44

42

40

38

36

34

36

56

34

60

OLUSTEE

HILDRETH

WELLBORN

COLUMBIA

LAKE CITY

FORT WHITE

WHITE

SPRINGS

58.52

32.87

24.82

25.45

30.38

28.73

33.08

33.68 33.21

33.81

34.53 33.71

23.49

28.34

37.62

22.24

35.54

18.95

33.96 35.49

51.73

28.54

35.96 19.57 17.16

28.91 35.18

35.34

55.70

42.48

32.79 32.38

56.86

17.5

22.96

21.72

25.40 23.97

29.07

43.44

35.26

43.23

36.98

51.89

39.07

35.22

56.52

37.63

35.80

35.57

37.04

42.60

49.43 48.84

52.91

60.37

56.97 54.86

37.00

47.83

37.80

52.41

58.75

57.18

57.73

55.16

56.39

53.99

17.02

18.04 17.92

23.85

22.40

23.06

30.01

34.96

26.16

33.95

52.17

25.35

24.98

25.06

25.62

27.55

24.65

22.56

23.70

24.57

30.18

33.02

55.67

44.42 47.35 42.78

0 5 10 MILES

0 5 10 KILOMETERS

23.49

ITCHETUCKNEE SPRINGSHED AREAL EXTENT

POTENTIOMETRIC CONTOUR Number shows altitude at which water level would have stood

in tightly cased wells. Contour interval is 2 feet. Datum is NAVD88. Dashed where inferred.

OBSERVATION WELL Number is altitude of water level in feet above NAVD88.

–

–

EXPLANATION

34

The Upper Floridan aquifer is a highly permeable unit of carbonate rock extending beneath most of Florida and parts of

southern Alabama, Georgia, and South Carolina. The high permeability is due in a large part to the widening of fractures

that developed over time and the formation of conduits within the aquifer through dissolution of the limestone. This

process has also produced numerous karst features such as springs, sinking streams, and sinkholes in northern Florida.

These dissolution features, whether expressed at the surface or not, greatly influence the direction of ground-water

flow in the Ichetucknee springshed adjacent to the Ichetucknee River. Ground water generally flows southwestward in

the springshed and discharges to the Ichetucknee or Santa Fe Rivers, or to the springs along those rivers. This map

depicts the September 9-10, 2003 potentiometric surface of the Upper Floridan aquifer based on 94 water-level

measurements made by the Suwannee River Water Management District. Ground-water levels in this watershed

fluctuate in response to precipitation and due to the high degree of interconnection between the surface-water system

and the aquifer.

Base from U.S. Geological Survey digital data.

Albers Equal-Area Conic Projection.

Standard Parallels 29 30 and 45 30 , central meridian 83 00 . °′ °′ °′

Location of the

Itchetucknee Springshed

study area