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Bohling, Geoffrey C. / A ground penetrating radar study of water table elevation in a portion of Wisconsin's central sand plain
[DNR-050] (1988)

I. Introduction: motivation and objectives,   pp. 1-9 PDF (2.5 MB)

Page 5

system in a discharge area. Therefore, use of an agricultural chemical on a
field in a discharge area should have a less detrimental effect on the
groundwater system than its use on a field in a recharge area.
B. Objectives
The primary objective of this study is to test the reliability of
ground penetrating radar (GPR) as a tool for obtaining high-resolution
maps of water table elevation. GPR surveys were performed in the sum-
mer and fall of 1987 in a portion of the Central Sand Plain with a fairly
dense set of existing water table observation wells. GPR is a geophysical
instrument which transmits an electromagnetic pulse into the ground and
records the return times of pulses reflected from subsurface interfaces, pro-
ducing a profile of return time versus horizontal distance as the radar is
pulled along the ground. In order to test the reliability of GPR as a water
table reconnaissance tool, sparse subsets of wells in the area are used to
calibrate the radar and water table depths obtained from these calibra-
tions are compared to known water table depths in the remaining wells.
Water table elevation maps produced from observation well data and from
the GPR data are also compared. Thus, the study tests whether GPR can
be used to help produce an accurate water table map when only a few
observation wells exist. The results of these comparisons are presented in
Chapter V.

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