The goal of research in the Eltahir group is to advance the understanding of the fundamental hydrological processes and mechanisms that govern the role of the biosphere in the dynamics of biosphere-atmosphere interactions and the associated water cycle at regional scales. Understanding of these processes is critical for the assessment of: (1) the impact of regional water resources due to deforestation, desertification, and irrigation, (2) the predictability of large-scale hydrological droughts and floods as sources of significant natural hazard, (3) the regional impacts on water resources, agriculture, and disease transmission that may result from any global change scenario.