The researchers studied water flow patterns in a tropical forest area in Colombia by analyzing water samples from different sources during dry and wet seasons. They found three trends indicating interactions between surface and groundwater, but these trends were not linked to geology or site type. Most samples fell close to the Colombian meteoric line, except for some swamp samples showing signs of evaporation. This suggests swamps may connect or disconnect from the river throughout the year. The study helps fill gaps in water isotope data in Colombia and provides insights into the hydrology of a tropical basin.