The resulting hydraulic conductivity field is highest at zone 13 whereas it is low at zone 2 (close to outflow). The specific yield field, on the other hand, maximized at zone 7 whilst minimized at zone 6. The resulting RMSE and NRMSE are, respectively, in a range 0.73–0.89 m and 0.02–0.025 obtained by COA optimization algorithm (see Table 2). High hydraulic conductivity at zone 13 may be temporarily confined to the groundwater regime to change aquifer characteristics. Since both parameters showed a high range of variability through the entire aquifer, it appears the hydraulic response of the aquifer to recharge and pumping processes is highly variable. In other words, groundwater regime may not track a steady-state condition. Variability in the hydraulic conductivity may further destabilize transmissivity (the hydraulic conductivity multiplied by the saturated thickness of the aquifer) at the vertical range of the aquifer. In groundwater studies, what is of the greater interest, however, is the significant positive and negative contributions to groundwater modeling made by hydraulic properties or any other parameters.