MODFLOW datasets for simulations of groundwater flow with downscaled global climate model data for the Suwannee River Basin, Florida

A previously-developed groundwater model of the Suwannee River Basin was modified
and calibrated to represent transient conditions. A simulation of recent conditions was
developed for the 372-month period 1970-2000, and was compared with a simulation of
future conditions for a similar-length period 2039-2069, which uses downscaled GCM
(Global Climate Model) data. The MODFLOW groundwater-simulation code was used
in both of these simulations, and two different MODFLOW boundary condition “packages”
(River and Streamflow Routing Packages) were used to represent interactions between
surface-water and groundwater features. The parameters for the simulation of future
conditions were developed from dynamically downscaled precipitation and evapotranspiration
data generated by the Community Climate System Model.