In terms of the importance of constructing new mega-urban zones to achieve future sustainable urban development for Egypt's Vision 2030, this research was initiated with the objective of protecting such zones by mapping flood hazards by "Multi-Criteria Decision Analysis" based on "Geographic Information System" (GIS-MCDA), where the Hegaza Village -Qena Governorate in Upper Egypt was taken as a study area. Accordingly, a research methodology was planned to encompass five investigations (Theoretical, field, numerical, analytical and inferential investigations). The hydrology of the study area was modeled by blending GIS Model-Builder and the hydrological model (HEC-1). A flood hazard map (F.H.M) was produced based on (GIS-MCDA), in terms of the Analytic Hierarchy Process (AHP). The research flagged out that the obtained results would most probably assist decisionmakers. In addition, the research highlighted the importance of implementing flood hazards management activities to ensure the environmental rehabilitation of watersheds to avoid flood disasters.