Water availability is a research area that focuses on studying the quantity and quality of water resources in a specific region or system. Researchers in this field examine factors such as precipitation patterns, groundwater levels, surface water flows, and water usage to assess the overall availability of water for various purposes such as agriculture, industry, and human consumption. They also investigate the impact of climate change, land use changes, and other factors on water availability, and develop strategies for sustainable water management and conservation. Overall, the goal of research in water availability is to ensure that societies have access to an adequate and reliable supply of clean water for their needs.