From these data, a relative scale of karst susceptibility was developed to assist land-use planners, developers, and the public in recognizing areas of high karst susceptibility. The Ceresville, Woodsboro, and Fountain Rock members of the Grove Formation and the Lime Kiln Member of the Frederick Formation have very high karst susceptibility. When unlined drainage, storm-water management areas, drainage diversions, or quarries are placed in proximity to these units, soil-cover collapses are likely to occur. A slightly lesser karst susceptibility is recognized for the Rocky Springs Station Member of the Frederick Formation. The Triassic Leesburg Formation, and the Monocacy and Adamstown members of the Frederic Formation have comparatively low karst susceptibility.