The field of Hydrology has long separated the study of surface water (streams, lakes, etc.) from groundwater, despite the clear connection of these systems. Over the last two decades, surface water and groundwater have increasingly been viewed as a single resource, producing a myriad of new and exciting scientific work on the subject. The quantity and quality of surface water can affect the volume and chemistry of groundwater, and vice versa. Interactions between these are crucial to understanding the ecosystems that depend on them, the processes governing hydrologic systems, and effective resource assessment and management practices. In this course you will learn in-class and field-based techniques for the quantification of surface water - groundwater interactions, explore the scientific literature investigating the interfaces between disciplines encapsulated by hydrologic and geologic systems and ecosystems. The class will examine a current issue related to surface water - groundwater interactions, and collectively, will provide concrete recommendations for addressing the issue in a final report.