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This report documents regional ground-waterflow models constructed by the U.S. Geological Survey in cooperation with the Minnesota Department of Health (MDH) to satisfy the requirements of their Source Water Protection Plan (SWPP). Steady-state single-layer ground-water-flow models were constructed with the computer program MODFLOW to simulate flow in surficial sand and gravel aquifers along the Mississippi River between Brainerd and St. Cloud in central Minnesota. The hydrogeologic data that were used to construct the models were compiled from available sources.
Calibrated values of horizontal hydraulic conductivity and areal recharge for the aquifer in a northern model area were 70 m/d and 3.0x10-4 m/d, respectively. This model was sensitive to net areal recharge, vertical hydraulic conductivity of perennial streambed sediments, and horizontal hydraulic conductivity. The major source of net inflow to the model was from edge boundary cells. The major source of net outflow was ground-water discharge to perennial and ephemeral streams.
Calibrated values of horizontal hydraulic conductivity and areal recharge for the aquifer in a southern model area were 70 m/d and 6.0x10-4 m/d, respectively. This model was sensitive mostly to horizontal hydraulic conductivity. Net areal recharge and ground-water discharge to perennial streams were the major sources of net inflow and outflow, respectively.
Abstract
Introduction
Purpose and Scope
Hydrogeologic Setting
Ground-Water Flow Models
Numerical Model Description and Assumptions
Model Input
Model Calibration, Sensitivity, and Results
Northern Study Area
Southern Study Area
Model limitations
Summary
Acknowledgments
References
Suggested Citation:
Ruhl, J.F., and Cowdery, T.K., 2004, Regional ground-water-flow models of surficial sand and gravel aquifers along the Mississsippi River between Brainerd and St. Cloud, central Minnesota: U.S. Geological Survey Scientific Investigations Report 2004-5087, 21 p.
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