Don Boniol, PG/PE
Division of Groundwater Programs
St. Johns River Water Management District
Carlos Fortich, GIS Analyst
Unpublished Material
GWPLIB.RECHARGE_FLORIDAN
vector digital data
Palatka, Florida
St. Johns River Water Management Distrct
Maps of ground water recharge areas are useful planning tools for groundwater resource management. Groundwater recharge to the Floridan aquifer, as presented in this map, is the addition of water to the Floridan aquifer from the overlying surficial aquifer or more directly from rainfall in areas where the surficial aquifer is thin or absent and the limestones of the Floridan aquifer are at or near land surface. The amount of water available as recharge to the Floridan aquifer is that part of rainfall, after losses to runoff and evapotranspiration, which infiltrates through the soil zone to the water table and continues to move downward to underlying aquifer systems. In addition, significant local recharge may occur where sinkholes have breached the upper confining unit.
Maps of ground water recharge areas are useful planning tools for ground water resource management. Sections 373.0391, 373.0395, and 373.0397, Florida Statutes, require the water management districts to provide recharge area information to local governments and planning agencies. Recharge areas of the Floridan aquifer in the St. Johns River Water Management District (SJRWMD) were mapped using a geographic information system to analyze the geologic and hydrologic factors that affect recharge.
The hydrogeologic characteristics of the surficial aquifer system, the intermediate aquifer system and confining unit, and the Floridan aquifer system determine areas and rates of recharge to the Floridan aquifer in SJRWMD. The surficial aquifer system extends from the land surface downward to the top of the intermediate confining unit separating the surficial and Floridan aquifer systems. The water table of the surficial aquifer is the upper surface of the zone of saturation. The intermediate confining unit, where present, retards the movement of water between the surficial and Floridan aquifers and confines the Floridan aquifer under artesian conditions. The water level in a well tapping the Floridan aquifer is called the potentiometric level, and this water level can be higher, lower, or at the same elevation as the water table. Leakance of water through the confining unit is dependent on its thickness and hydraulic conductivity.
Recharge to the Floridan aquifer occurs in areas where the water table elevation is higher than the Upper Floridan potentiometric elevation, creating downward hydraulic pressure to move water through the confining unit. In areas where the Upper Floridan potentiometric surface is at a higher elevation than the water table, leakance is upward from the Floridan to the surficial aquifer. The areas of upward leakance define the discharge areas of the Floridan aquifer. Where Floridan potentiometric elevations are above the land surface, springs and free-flowing artesian wells occur.
Recharge rates to the Floridan aquifer were calculated based on an analysis of the hydraulic pressure differences between the surficial aquifer water table and the Floridan potentiometric surface, and on the leakance of water through the confining unit separating the aquifers. Recharge also occurs directly from infiltrating rainfall where the limestones of the Floridan aquifer are at or near land surface. Significant recharge may also occur where the confining unit is breached by sinkholes and sinkhole-related features, depending on the hydrogeologic relationships between the surficial and Floridan aquifers. Recharge rates were mapped at a 4 inch/year contour interval.
The following mathematical operations were performed to determine confining unit leakance, hydraulic pressure differences between the surficial and Floridan aquifers, and recharge to the Floridan aquifer:
Hydraulic pressure difference = water table elevation minus
Floridan potentiometric surface elevation
Leakance = vertical hydraulic conductivity of confining unit divided by thickness of confining unit
Recharge = hydraulic pressure difference multiplied by leakance
The input raw data used for the hydraulic pressure difference map (water table elevation minus Floridan potentiometric elevation) and the confining unit thickness map (confining unit elevation minus Floridan aquifer system elevation) were compiled from SJRWMD databases. While a large number of data points were available for these data layers, the data are concentrated in some areas and sparse in other areas. Geostatistical methods using the ISATIS software program were used to analyze the spatial characteristics of the data to produce the best estimation of each data layer throughout SJRWMD. Grid outputs (115 meter x 115 meter) for each layer were exported to ArcMap to perform the mathematical operations described above. Heterogeneity in confining unit properties and lack of vertical hydraulic conductivity data from cores made it impractical to estimate conductivity using geostatistics. As a result, sensitivity analysis on available conductivity data was used to determine the conductivity value and leakance range that most closely approximated leakance values derived from groundwater flow model calibrations.
This December 2004 Floridan aquifer recharge map updates the map published in Technical Publication SJ93-5, "Recharge Areas of the Floridan Aquifer in the St. Johns River Water Management District." The recharge map provides a regional assessment of recharge to the Floridan aquifer. The map is intended to be used as a regional planning aid for groundwater resource management. The map is not intended for site-specific assessments.
200501
ground condition
None planned
-82.476813
-80.302854
30.833962
27.457403
SJRWMD-GIS Metadata Thesaurus
elevation
environment
geoscientificInformation
inlandWaters
recharge
Floridan
Aquifer
Upper Floridan
Confining Unit
SJRWMD-GIS Metadata Thesaurus
St. Johns River Water Management District
Florida
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None, The St. Johns River Water Management District, Department of Resource Management, Ground Water Programs Division, asks to be credited in derived products.
The St. Johns River Water Management District prepares and uses information for its own purposes and this information may not be suitable for other purposes. This information is provided ''as is''. Further documentation of this data can be obtained by contacting: St. Johns River Water Management District, GIS Analyst, Division of Groundwater Programs. See Metadata Reference Section of this document for additional contact information.
St. Johns River Water Management District
Don Boniol; PG/PE
Hydrologist, Division of Groundwater Programs
mailing address
PO Box 1429
Palatka
Florida
32178-1429
USA
(386) 329-4188
dboniol@sjrwmd.com
0800 - 1700 EST
See Metadata Reference Section of this document for additional contact information.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332
200501
ground condition
Metadata imported.
Vector
G-polygon
21770
G-polygon
19539
GT-polygon composed of chains
21770
Point
4
Transverse Mercator
0.999600
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500000.000000
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coordinate pair
0.001024
0.001024
meters
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
GWPLIB.RECHARGE_2005_old
GWPLIB.RECHARGE_2005
St. Johns River Water Management District
GIS Analyst, Division of Groundwater Programs
mailing address
PO Box 1429
Palatka
Florida
32178-1429
USA
0800 - 1700 EST
See Metadata Reference Section of this document for additional contact information.
Downloadable Data
The St. Johns River Water Management District prepares and uses information for its own purposes and this information may not be suitable for other purposes. This information is provided ''as is''. Further documentation of this data can be obtained by contacting: St. Johns River Water Management District, GIS Analyst, Division of Groundwater Programs. See Metadata Reference Section of this document for additional contact information.
8.984
http://www.sjrwmd.com; ftp://ftp.sjrwmd.com/gwp/
1. Use the DISTRICT website: http://www.sjrwmd.com to download online data. 2. How to request offline data: Shared datasets may be made available via email or ftp. If zip file(s) are too large to email, request temporary placement to above ftp site.
Windows
Options: There is no charge for downloading data from the DISTRICT web site at http://www.sjrwmd.com. Data can be ordered on DVD as instructed on the web site.
20070612
St. Johns River Water Management District
Jill A. Stokes
GIS Analyst, Department of Resource Management, Ground Water Programs Division
mailing address
PO Box 1429
Palatka
Florida
32178-1429
USA
386.329.4336
gwpsupport@sjrwmd.com
0800 - 1700 EST
If Contacts not available; Contact:
St Johns River Water Management District
Dept of Resource Management
Ground Water Programs Division (GWP)
386.329.4500 - main District phone
368.329.4835 - main GWP phone
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FGDC-STD-001-1998
local time
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