Researchers from Western Michigan University led by Dr. Mohamed Sultan and from Ain Shams University led by Dr. Baher El Kalioubi are applying an integrated approach that utilizes remote sensing, geophysical, field, and geochemical data together with hydrological modelling to develop a better understanding of the hydrologic setting, longevity, and optimum utilization of the Nubian Sandstone Aquifer System (NSAS). Specifically, the research team is addressing the following questions: (1) Where are, and what is the nature of the observed temporal variations in Gravity Recovery and Climate Experiment (GRACE)-derived Terrestrial Water Storage (TWS) over the NSAS? (2) Is the NSAS being depleted? If it is, which part(s) are being depleted and what are the depletion rates? (3) What is the nature of the factors causing these depletions? (4) For how long could the NSAS be utilized given current and/or projected rates of extraction? (5) Is the NSAS receiving modern recharge? If so, where is it receiving modern recharge? What is the recharge rate? The project is funded by the U.S. - Egypt Science and Technology (S&T) Joint Fund. The opinions, findings, conclusions, or recommendations expressed are those of the authors alone and do not necessarily reflect the views of USAID or NAS.