Hydrology is the scientific study of the movement, distribution, and quality of water on Earth. This discipline investigates the global water cycle, encompassing precipitation, runoff, infiltration, and evaporation. It examines various components of Earth's hydrological system, including surface water bodies such as rivers and lakes, and subsurface flow within aquifers and groundwater systems. Hydrological study is crucial for understanding the availability of freshwater resources, predicting flood risks, and modeling the impacts of climate change on natural systems, thereby providing essential data for environmental management and water resource engineering.