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Analysis of the Effect of Pumping on Ground-Water Flow in the
Springfield Plateau and Ozark Aquifers Near Springfield, Missouri
Imes, JL
Available from Books and Open-File Report Section, USGS Box 25425,
Denver, CO 80225. USGS Water-Resources Investigations Report
89-4079, Oct. 1989. 63p, 31 fig, 3 tab, 23 ref.
Pumpage of water from the Ozark aquifer for public supply and
industry use by the city of Springfield and surrounding
communities in southwestern Missouri has significantly altered the
potentiometric surface of the aquifer. Springfield is located on a
regional groundwater divide that trends east and west across
southern Missouri. Groundwater that once flowed north and south
from the divide now moves toward Springfield. Drawdown in the
Ozark aquifer beneath Springfield has increased about 50 ft near
the center of the city since 1974. The area of well influence also
has increased, most notably to the south and southwest, because of
increased pumpage by Springfield and new groundwater withdrawals
in rapidly increasing communities, such as Republic and Nixa.
Changes in the potentiometric surface of the Ozark aquifer, and to
a lesser extent the Springfield Plateau aquifer, resulting from
stresses applied by pumpage of water supply wells has altered the
hydrologic budget of the Springfield area. Downward leakage of
groundwater through the Ozark confining unit has increased from
about 10 cu ft/sec to about 18 cu ft/sec because drawdown in the
Ozark aquifer has resulted in an increased vertical hydraulic
gradient across the confining unit. Minimal quantities of water
are supplied by increased upward leakage through the St. Francois
confining unit. Model simulations indicate substantial quantities
of water are still (1987) being removed from storage within the
Ozark and Springfield Plateau aquifers and the hydrologic system
is not in equilibrium at this time. (USGS)
 Descriptors: Groundwater mining | Drawdown | Missouri | Springfield Plateau | Ozark
Aquifer | Groundwater | Wells | Geohydrology | Hydrologic budget | Model studies | Water use
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