Recharge is a research area within hydrology and water resources management that focuses on the process of replenishing groundwater reserves. It involves studying the mechanisms by which water from precipitation or surface water sources infiltrates the ground and moves downward to replenish aquifers. Understanding recharge processes is crucial for sustainable water management, as it helps in maintaining groundwater levels and supporting ecosystem health. Researchers in this field employ various methods such as groundwater modeling, isotopic analysis, and field monitoring to study recharge processes and assess their impacts on water availability and quality. Ultimately, the goal of recharge research is to develop effective strategies for managing water resources and ensuring their long-term sustainability.