The researchers aimed to determine a range of hydrogeological parameters for a groundwater flow model in El-Qaa Plain aquifer, Sinai, Egypt. They used inverse groundwater modeling to estimate values like hydraulic conductivity and transmissivity. The results showed that the hydraulic conductivity ranged from 1 to 2 m/day, and transmissivity ranged from 200 to 500 m2/day. They also found a relationship between recharge rate and hydrogeological parameters, and created maps showing the spatial distribution of hydraulic conductivity. These findings can help predict groundwater flow and pollution in the future.