Description
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.
Date Issued
2004
Number of Pages
26
Decade
Associated Organization
Publisher
U.S. Geological Survey
Main Topic
Keywords
Status
Body of Water
Format
Rights Holder
Minnesota Water Research Digital Library
Rights Management
Creative Commons