The purpose of this research is to examine the change in water resources over the previous 50 years in the Lam River basin (also known as the Ca River) in Nghe An province, an important water resource basin in the North Central area. According to the findings, the amount of flow through hydrological stations on rivers and streams in Nghe An province has been falling since 2012, and the yearly flow pattern is continuously dropping. For many years following 2015, the flow has been lower than typical, owing to the drought that occurred during the dry season of 2015-2016.