“…RCH, GWA, GWD are respectively groundwater recharge to the subsurface from rainfall, groundwater abstractions and groundwater discharge through the southern limits of the flow domain (See Figure 4.1). Estimates of the above different groundwater budget components are based on abstractions data from the national data base (BDI-DGEau), recharge calculation based on climatic data and groundwater modelling from previous studies (Kpegli et al, 2018b). The total groundwater input (from both rainfall and net rivers leakage is estimated to be in average 2×10 8 m 3 /year while the total output (through groundwater abstractions/outflows (from wells, boreholes, artesian wells), springs and groundwater discharge out of the system (through the southern limits)) is about 1.46×10 8 m 3 /year, representing about 73% of the total input.…”