MODFLOW-2000 and MODPATH models for simulations used to delineate contributing areas for 2017 pumping conditions to selected wells in Ingham County, Michigan: U.S. Geological Survey data release

A regional groundwater flow model (https://pubs.usgs.gov/sir/2009/5244/) was updated to reflect 2017
pumping conditions in the Tri-County Region covering most of Clinton, Eaton, and Ingham Counties,
Michigan. This model was developed to simulate the regional hydrologic system in Tri-County area
and continues to be used for planning and protection of area water supplies. Revised contributing area
delineations in response to recent pumping conditions were needed for local wellhead protection area
programs. The model was calibrated to water level observations for 2017 from well driller logs, average
water levels for 2012-17 from active USGS observation wells, and estimated baseflow for 2012-16 from
USGS streamgaging station measurements. The model was used to delineate 10- and 40-year
contributing areas to selected wells in Lansing and East Lansing, Michigan. This USGS data release
contains all of the input and output files for the MODFLOW and MODPATH simulations described in
the associated model documentation report (https://doi.org/10.3133/ofr20181133).