OPEN-FILE REPORT 2006-1031
U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
Prepared in cooperation with the
Suwannee River Water Management District
Sepúlveda, A.A. and others, 2006, Potentiometric Surface of the Upper Floridan Aquifer in the
Ichetucknee Springshed and Vicinity, Northern Florida, September 2003
82°45′
82°30′
HAMILTON
COUNTY
53.99
56.39
WHITE
SPRINGS
SUWANNEE COUNTY
54
COLUMBIA COUNTY
BAKER COUNTY
56
57.18
75
54.86
56.97
41
10
441
58
58.75
10
29°45′
WELLBORN
52.91
60
58.52
56
60.37
58
54
48.84
49.43
42.78
42.60
52
52.41
44.42
42
OLUSTEE
50
48
46
44
55.67
47.35
56
LAKE CITY
38
ek
e
r
C
55.16
37.00
40
90
47.83
37.80
57.73
37.04
36
t
100
35.80
56
O lu
se
e
35.57
37.63
56.52
35.22
39.07
51.89
34.53
33.71
36.98
34
43.23
35.26
33.81
41
COLUMBIA
441
33.02
43.44
32.87
33.21
54
33.68
47
32.79
32.38
42.48
32
33.08
75
ek
e
r
C
30.18
247
35.34
UNION COUNTY
17.16 19.57
33.96
34.96
36
Olustee
BRADFORD
COUNTY
40
35.54
22.24
38
129
51.73
42
18.95
34
er
e
Santa F
35.49
32
18
16
16
28.54
52.17
18
18
30.01
FORT WHITE
27
47
nne
wa
Su
37.62
ALACHUA COUNTY
121
34
e River
26.16
36
GILCHRIST COUNTY
28.34
32
LAFAYETTE
COUNTY
35.96
Riv
18
24
22
20
r
e
v
i
R
Santa Fe
33.95
23.85
20
Ic h e
HILDRETH
17.5
k
30
27
121
26
28
17.02
tu c
22.96
23.97
35.18
44
22
24
28.91
48
26
24.57 25.45
24.65
25.62
25.40 23.70
25.06
24.98
22.56
25.35
21.72
24.82
r
e
v
18.04 e Ri 17.92 23.06
22.40
ne
46
27.55
55.70
50
30
30.38
29.07
28
52
28.73
29°30′
56.86
23.49
Base from U.S. Geological Survey digital data.
Albers Equal-Area Conic Projection.
Standard Parallels 29°30′ and 45°30′, central meridian 83°00′.
EXPLANATION
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.
ITCHETUCKNEE SPRINGSHED AREAL EXTENT
Location of the
Itchetucknee Springshed
study area
34
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.
23.49
OBSERVATION WELL–Number is altitude of water level in feet above NAVD88.
5
0
0
POTENTIOMETRIC SURFACE OF THE UPPER FLORIDAN AQUIFER IN THE
ICHETUCKNEE SPRINGSHED AND VICINITY, NORTHERN FLORIDA, SEPTEMBER 2003
By
A. Alejandro Sepúlveda, Brian G. Katz, and Gary L. Mahon
2006
5
10 MILES
10 KILOMETERS