Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1989
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George R. Schiner
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Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1988
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity, for May 1988. The Upper Floridan aquifer is the principal source of potable water in the area. Water level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area of Nassau County, a 30-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 127 ft above sea level in Polk County to 79 ft below sea level in Nassau County. Water levels in many key wells were about the May average. Most levels in the district were below the levels of May 1987. Declines of about a foot or less from May 1987 levels were common along the coast, but inland, the potentiometric surface declined as much as 2 to 6 ft in places.
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Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1987
The potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity is shown for May 1987. The Upper Floridan aquifer is the principal source of potable water in the area. Water level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-ft contour intervals. In the Fernandina Beach area of Nassau County, a 30-ft interval is used to show a deep cone of depression. The potentiometric surface ranged from 129 ft above sea level in Polk County to 54 ft below sea level in Nassau County. Water levels in key wells ranged from several ft above to several ft below the May average in response to areal patterns of rainfall. Most levels in the district were above the below average levels of May 1986. Rises of about 2 ft from May 1986 levels were common in the southern half of the District, and the potentiometric surface rose as much as 6 to 8 ft in places. (USGS)
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Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1986
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Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1985
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1985. The Upper Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area of Nassau County a 30-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 125 feet above sea level in Polk County to 74 feet below sea level in Nassau County. Water levels in key wells ranged from 1 to 8 feet below average for May in response to lack of rainfall and an attendant increase in pumpage. Many levels in the district were considerably below the levels of May 1984. Declines of 5 to 7 feet from May 1984 levels were common in the western and northern parts of the district. However, the largest declines from May 1984 levels were mostly in well fields along the coastline. Levels in some wells reached record lows. (USGS)
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Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1985
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1985. The Upper Floridan aquifer is the principal source of potable water in the area. Water level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area of Nassau County, a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 130 feet above sea level in Polk County to 91 feet below sea level in Nassau County. Water levels in key wells were mostly about 1 foot below average for September but were trending upward in response to the rainfall that broke the drought-like dry season. Most levels in the district were below the levels of September 1984. Declines of 3 to 5 feet from September 1984 levels were common in the midwestern part of the district. However, most September 1985 levels ranged from 2 to 7 feet above those of May 1985. (USGS)
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Potentiometric surface of the Floridan Aquifer, Southwest Florida Water Management District, May 1984
A May 1984 potentiometric surface map of the Southwest Florida Water Management District depicts the annual low water-level period. Water levels in most wells measured in May 1984 were lower than in September 1983. May levels averaged about 1 foot lower than September levels in areas north of latitude 28 07'10' ' and about 9 feet lower in southern areas. Generally, water levels in May 1984 were lower when compared to May 1983. Water levels in most wells measured in May 1984 averaged less than 1 foot lower than May 1983 levels in the north and about 2 feet lower in the south. (USGS)
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Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1984
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1984. The Upper Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 126 feet above sea level in Polk County to 84 feet below sea level in Nassau County. Water levels in key wells were mostly above, or less frequently, slightly below averages for May in response to diverse area rainfall patterns. Most levels in the district were about the same, or more commonly, 1 to 2 feet lower than May 1983 levels.
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Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1984
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1984. The Upper Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area of Nassau County a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 130 feet above sea level in Polk County to 83 feet below sea level in Nassau County. Water levels in key wells ranged from slightly above average to several feet below average for September in response to diverse area rainfall patterns. Most levels in the district were about the same as the levels of September 1983. However, in Nassau County levels were generally below those of September 1983, and levels in Volusia County were mostly higher than September 1983 levels. (USGS)
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Potentiometric surface of the Floridan Aquifer, Southwest Florida Water Management District, May 1983
Maps of the potentiometric surface of the Floridan aquifer in west-central Florida are prepared semiannually by the U.S. Geological Survey in cooperation with the Southwest Florida Water Management District. Maps for May and September show, respectively, the potentiometric surface of the normally expected annual low and high water level conditions. This report shows the potentiometric surface of the Floridan aquifer for May 1983. Water level measurements were made during May 16-27. The map represents water level conditions when groundwater withdrawals for agricultural use are high, before the beginning of the summer rainy season. Therefore, the potentiometric surface is near its lowest level for the year. (Lantz-PTT)
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Potentiometric surface of the Floridan Aquifer, Southwest Florida Water Management District, September 1983
Maps of the potentiometric surface of the Floridan aquifer in west-central Florida are prepared semiannually by the U.S. Geological Survey in cooperation with the Southwest Florida Water Management District. Maps for May and September show the potentiometric surface that is close to the annual low or high water level condition that usually occurs in May or September, respectively. The surface is mapped by determining the altitude of water levels in a network of wells and is represented on maps by contours that connect points of equal altitude. This report shows the potentiometric surface of the Floridan aquifer for September 1983. Data for the map were collected during September 12-23. The map represents water level conditions near the end of the summer rainy season when groundwater withdrawals for agricultural use are low. Water levels in most wells measured in September 1983 were higher than those measured in May 1983. September water levels averaged about 0.6 ft higher than May levels in areas north of Hillsborough County and about 7 ft higher in southern areas. Water level increases in the north ranged from zero to about 2 ft along coastal regions and from zero to about 5 ft in inland areas. Water level declines in the north ranged from zero to about 7 ft and occurred in scattered parts of all northern counties. In the south, water level increases ranged from zero to about 3 ft along coastal and extreme southern regions and from about 5 to 34 ft in other southern areas. The greatest water level increases occurred in southern Hillsborough County where irrigation pumpage contributes to large seasonal fluctuations. There were a few areas in Hillsborough and Pinellas Counties where September water levels showed declines ranging from about 1 to 3 ft when compared with May levels. (Lantz-PTT)
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Potentiometric surface of the Floridan Aquifer, Southwest Florida Water Management District, September 1982
A September 1982 potentiometric surface map of the Southwest Florida Water Management District depicts the annual high water-level period. Water levels in most wells measured in September 1982 were higher than in May 1982. Levels averaged about 12 feet higher in the southern part of the area and about 5 feet higher in the north. In agricultural areas of southeastern Hillsborough, Manatee, southwestern Polk, Hardee, northwestern De Soto, and northern Sarasota Counties, water-level increases ranged from 1 to 27 feet. From September 1981 to September 1982, water-level changes ranged from slight decreases in some parts of the study area to 1- to 22-foot increases in the major part of the study area. (USGS)
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Potentiometric surface of the Floridan aquifer, Southwest Florida Water Management District, May 1982
A May 1982 potentiometric surface map of the Southwest Florida Water Management District depicts the annual low water-level period. Water levels in most wells measured in May 1982 were lower than in September 1981. Levels averaged about 9 feet lower in the southern part of the area and 1.5 feet lower in the north. In agricultural areas of southern Hillsborough, Manatee, southwestern Polk, southern Hardee, northwestern De Soto, and northern Sarasota Counties, water-level declines ranged from 5 feet to 29 feet. From May 1981 to May 1982, water-level increases ranged from about 3 feet in the northern counties to about 20 feet in the middle and southern counties. Water-level increases were about 4 feet in the extreme southern part of the study area.
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Potentiometric surface of the Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1982
This map presents the potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1982. The Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area 20-foot intervals are used to show a deep cone of depression. The potentiometric surface ranged from 128 feet above NGVD (National Geodetic Vertical Datum of 1929) in Polk County to 68 feet below NGVD in Nassau County. Because of above average rainfall, water levels began to recover from record low levels set in September 1981 in many counties. Except in a few places, water levels throughout the District rose above May 1981 levels. May 1982 levels were as much as 9 feet and commonly 1 to 3 feet higher than the below normal May 1981 levels. (USGS)
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Potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1982
This map presents the potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1982. The Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area a 40-foot interval is used to show a deep cone of depression. The potentiometric surface ranged from 131 feet above NGVD (National Geodetic Vertical Datum of 1929) in Polk County to 68 feet below NGVD in Nassau County. Water levels continued to recover from record low levels set in September 1981. Except in a few places, water levels throughout the District rose above September 1981 levels. September 1982 levels were as much as 10 feet and commonly 2 to 3 feet higher than the below normal September 1981 levels. (USGS)
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Potentiometric surface of the Floridan Aquifer, Southwest Florida Water Management District, May 1981
A May 1981 potentiometric-surface map of the Southwest Florida Water Management District depicts the annual low water-level period. Potentiometric levels decreased 10 to 45 feet between September 1980 and May 1981 in the citrus and farming sections of southern Hillsborough, northern Hardee, southwestern Polk, northwestern DeSoto, and Manatee Counties. Water levels in these areas are widely affected by pumping for irrigation and have the greatest range in fluctuations. Water-level decreases ranged from 0 to 1 feet in coastal, northern, and southern areas of the Water Management District. Water levels in all of the approximate 700 wells measured in May 1981 are lower than May 1980 because of the virtual absence of rainfall in April and May. (USGS)
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Potentiometric surface of the Floridan Aquifer, St. Johns River Water Management District and vicinity, Florida, May 1981
This map presents the potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity for May 1981. The Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made in approximately 1,000 wells and at several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area 20 and 40-foot intervals are used to show a deep cone of depression. The potentiometric surface ranged from 122 feet above NGVD (National Geodetic Vertical Datum of 1929) in Polk County to 125 feet below NGVD in Nassau County. Water levels were at record lows in many counties due to lack of rainfall. Declines were as much as 10 feet and commonly 5 feet from the May 1980 levels. (USGS)
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Potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1981
This map presents the potentiometric surface of the Floridan acquifer in the St. Johns River Water Management District and vicinity for September 1981. The Floridan acquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric surface is shown mostly by 5-foot contour intervals. In the Fernandina Beach area 20- and 40-foot intervals are used to show a deep cone of depression. The potentiometric surface ranged from 134 feet above NGVD (National Geodetic Vertical Datum of 1929) in Polk County to 90 feet below NGVD in Nassau County. Record low water levels for September were recorded in many counties due to lack of rainfall. September 1981 levels were as much as 10 feet and commonly 2 to 3 feet lower than the below normal September 1980 levels. Water levels rose from September 1980 levels on the coastline at St. Augustine and from Flagler Beach south to New Smyrna Beach.
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