Tashamingo Subdivision in Sinking Creek Karst Valley, a tributary of the Garretts Spring Drainage Basin in Jessamine and Woodford Counties, Kentucky, was flooded in February 1989. To determine the cause of flooding, the boundary of the ground-water basin was mapped, discharge data were measured to determine intake capacity of swallow holes, and hydrologic modeling of the basin was conducted. Swallow-hole capacity was determined to be limited by the hydraulic parameters of the conduit, rather than by obstruction by trash. Flooding from a precipitation event is more likely, and will be higher, when antecedent soil moisture conditions in the watershed are near saturation. Hydrologic modeling shows that suburban development of 20 percent of the southeastern basin will cause an increase in flood stage at Tashamingo Subdivision.