The participation of the scientific conference held in Hammamet ,Tunisia, during the period 28 - 30 March 2019, entitled "APPLIED GEOSCIENCE FOR GROUNDWATER" AGIC2019. In this event more than 100 participants from 15 countries, have successfully addressed current and future challenges in GROUNDWATER with four keynote and more than 80 interesting oral and poster presentations. The successful NSAS-JA contribution in this event was presented by hydrogeologist Abdalraheem Huwaysh, the Executive Director of the Joint Authority as an oral presentation, entitled " Development and Calibration of Transient Groundwater Flow Model for Al Kufrah Region, Southeast Libya"