Title: Explanatory Notes to Map Report WRI 76-80
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Permanent Link: http://ufdc.ufl.edu/WL00001873/00001
 Material Information
Title: Explanatory Notes to Map Report WRI 76-80
Physical Description: Book
Language: English
 Subjects
Spatial Coverage: North America -- United States of America -- Florida
 Notes
Abstract: Explanatory Notes to Map Report WRI 76-80
General Note: Box 9, Folder 9 ( SF -Red Bulls Eye Map - 1976-1977 and 1990 ), Item 1
Funding: Digitized by the Legal Technology Institute in the Levin College of Law at the University of Florida.
 Record Information
Bibliographic ID: WL00001873
Volume ID: VID00001
Source Institution: Levin College of Law, University of Florida
Holding Location: Levin College of Law, University of Florida
Rights Management: All rights reserved by the source institution and holding location.

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st^ noSoutlhwest Florida
SWater Maragnemenrt District
B S T' fi 5060 U.S. HIGHWAY 41, SOUTH BROOKSVILLE, FLORIDA 33512
S. 9 6 I ) PHONE (904) 796-7211

DERRILL McATEER. Chairman. Brooksvillc THOMAS VAN DER VEER. Secretary, Yankeetown RONALD B. LAMBERT. Wauchula
GI J. R. GRAW, Vice Chairman, Ocala S C. BEXLEY. JR.. Land O'Lakes ROBERT MARTINEZ, Tampa
JOE E HILL, Treasurer. Leesburg N. BROOKS JOHNS. Lakeland LEWIS H. HOMER. Clearwater
Donald R. Feaster, Executive Director


EXPLANATORY NOTES TO MAP REPORT WRI 76-80



Hydrogeological maps of this nature serve to record the status of groundwater
resources a.,'some point in time and to approximate the system's net change over
a span of time. Such maps provide important clues to regional groundwater condi-
tions in the Southwest Florida Water Management District.

Map report WRI 76-80 follows, supplements, and supercedes HA-440 by Stewart and
others (1971), which map depicted the potentiometric surface in May 1969 plus the
change from January 1964 to May 1969. HA-440 represented the best available change
map of the District when prepared, and has provided the District with useful water-
resource management information. WRI 76-80 was prepared due to concern over the
large increase in groundwater withdrawals during the past six years, and for the
recognized need to document long term groundwater trends. Technical understanding
of the groundwater system is continually being advanced by increasing the number
of observation wells in areas of large groundwater withdrawals, by survey leveling
of observation wells, and by improved general knowledge of the hydrogeology of the
area through investigative studies. WRI 76-80 is based on more than one thousand
water-level measurements made in wells throughout the District, which represents
an improvement of some 100% in number of well data points incorporated into HA-440.

The reader is cautioned not to overlay the 1969 and 1975 potentiometric surface
maps to obtain water-level changes. Such calculated changes will not always corre-
spond to values on the WRI 76-80 change map which have been derived from field
observed data of actual water level changes in wells. Note that in areas of sparse
water-level data, potentiometric contour lines were interpolated and smoothed to
conform with the known hydrogeology. Considerable hydrologic judgment is exercised
in drawing change maps, i.e., it is quite reasonable that different experts could
interpolate such contours differently, depending on their individual knowledge of
area conditions. .Regarding WRI 76-80, the generalized colored change intervals
represent In a general way the trend of hydrologic change in the groundwater system
between May 1969 and May 1975.

Where detailed and quantitative information is needed, the user should contact the
U. S. Geological Survey office in Tampa.

SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT

January 5, 1977


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