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Efforts are underway at Penn State University to explore stormwater runoff in an urbanizing watershed underlain by karst bedrock. This study focuses on the installation and performance of two experimental low-head weirs and infiltration areas located in the 183 ha Fox Hollow Watershed. Site analyses based on soil and rock corings and infiltration tests prior to installation indicated the site was suitable for development as an infiltration field. In 2002, low-head weirs were constructed to promote infiltration and groundwater recharge. A monitoring program was initiated to record the performance of the weirs and to allow mass balance calculations. Performance of the low-head weirs for various storm events are herein reported. During 2003 through 2005, which included two of the wettest years on record, few events resulted in significant runoff outflow from the low-head weirs and associated infiltration areas. For smaller runoff events, in most cases all of the runoff infiltrated, whereas for the larger events, over 50 % of the runoff volume entering the area infiltrated, and the peak rates and runoff volumes were substantially reduced in all cases. These data support the hypothesis that, in karst-underlain watersheds undergoing substantial development, it is critical to identify and preserve critical recharge areas, and that simple low-head weirs designed to enhance infiltration improve or sustain recharge and thereby reduce potential stormwater runoff.