A Digital-Computer Model of the Big Sioux Aquifer in Minnehaha County, South Dakota Page: IV
49 p. : ill. ; 28 cm.View a full description of this report.
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ILLUSTRATIONS
Page
Figure
1. Map showing location of the study area and the
Big Sioux River basin . . . . . . . . . . . . . . . . .
2. Map showing location of the Big Sioux aquifer
in the study area . . . . . . . . . . . . . . . . . . .
3. Well-numbering diagram . . . . . . . . . . . . . . . .
4. Hydrograph of water-level fluctuations in
well 102N49W32DBAC and annual departure from
normal precipitation at Sioux Falls . . . . . . . . . . .
5. Map showing thickness of sand and gravel in
the Big Sioux aquifer . . . . . . . . . . . . . . . . .
6. Graph showing cumulative stream gain or loss in the
Big Sioux River between Dell Rapids and Cliff Ave.
streamflow-gaging station at Sioux Falls . . . . . . . . .
7. Map showing location of aquifer model area and
constant head nodes and observation wells used for
calibration of the steady-state and transient simulations .
8. Graphs showing annual and monthly maximum, minimum,
and average municipal pumpage at Sioux Falls and
annual irrigation pumpage from 1970-79 . . . . . . . . .
9. Map showing altitude of base of the Big Sioux aquifer . . .
10. Map showing computer-simulated water levels under
steady-state conditions based on average hydrologic
conditions from 1970-79 . . . . . . . . . . . . . . . .
11. Map showing computer-simulated water levels under
steady-state conditions prior to ground-water withdrawals
12. Map showing computer-simulated drawdown in the
Big Sioux aquifer after simulating hydrologic
conditions for 1976 . . . . . . . . . . . . . . . . . .
13. Hydrographs showing comparison of computer-simulated
and measured water levels in three wells completed in
the Big Sioux aquifer, 1976 . . . . . . . . . . . . . . .
14. Map showing computer-simulated drawdown after
16 months of pumping under 1976 hydrologic
conditions except for a dry river . . . . . . . . . . . .
15. Map showing computer-simulated water levels after 1 year
of pumping under 1976 hydrologic conditions and a pumping
rate of 44.4 cubic feet per second from 60 wells
16. Map showing computer-simulated drawdown after 1 year
of pumping under 1976 hydrologic conditions and a pumping
rate of 44.4 cubic feet per second from 60 wellsiv
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Koch, Neil C. A Digital-Computer Model of the Big Sioux Aquifer in Minnehaha County, South Dakota, report, October 1982; United States. (https://digital.library.unt.edu/ark:/67531/metadc968270/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.