This model archive documents the Soil-Water-Balance (SWB) model used to simulate potential recharge for portions of Pennsylvania and Maryland from 2000 to 2021. The Pennsylvania and Maryland SWB model was used to create output at a 250 meter grid scale. Model parameters were adjusted using baseflow estimates from 36 reference watersheds varying in area from 0.37 to 817 square miles. The simulations were used to create 21-year grids of annual potential recharge and evapotranspiration, and the sensitivity of the model to parameter adjustments. The model archive includes all the files used in the sensitivity model runs, which are described in the accompanying Scientific Investigations Report 2022-5054. The directory structure of the model archive contains all the files needed to document and run the model. The directories in the archive are presented each as a separate .zip file and include an "ancillary" directory, a "bin" directory, a "georef" directory, a "model directory, an "output" directory, and a "source" directory. There is a README file describing all the files and directories in the archive and information on how to run the model. Each primary folder also contains a README file describing the contents.