Some of the world’s most productive aquifers occur in karst terrains. In addition, karst aquifers supply fresh water to about one-quarter of the world’s population. Due to their heterogeneity, karst aquifers can vary greatly in their hydrologic properties as a function of scale, rock type, and porosity. This session will present new research related to hydrogeology in karst systems, including groundwater flow, groundwater/surface water interactions, and karst development. Papers that include the use of innovative techniques such as hydrologic tracers both natural and induced, GIS, GPR, or others to characterize the hydrologic properties of karst are encouraged.