Researchers investigated using temperature measurements to track groundwater flow in mountainous areas. They collected data on soil and well temperatures, and developed a simple model to estimate groundwater recharge rates. Results showed varying soil temperatures across sites, with factors influencing these differences identified. They also found differences in groundwater recharge rates and discharge patterns in different areas. By combining surface and subsurface temperature measurements, they were able to identify sources of groundwater recharge in valley aquifers. The study highlights the importance of accurate temperature data in understanding groundwater flow patterns in mountain regions.