Esayas AlemayehuYosan Legesse2025-08-312025-08-312023-10https://etd.aau.edu.et/handle/123456789/7277Nonrevenue water is one of the resisting problems for water utilities in developing countries. The lack of detail information on system condition is intensifying the challenges. To address the problems, understanding the condition of water distribution system is fundamental. Thus, the study focused on model based enhancement of nonrevenue water management and conducted in ex-main office (EXMO) hydraulic zone of Addis Ababa water distribution system. The integrated model of GIS and Water-GEMS was used to evaluate existing conditions. The water balance software used to analysis the nonrevenue water. As the result, the nonrevenue water of the zone was 44.58%, the hydraulic analysis showed 84.48% and 41% of the nodes received recommended pressure 15m to 60m while 4.81% and 27.18% of pipes experienced recommended velocity 0.6m/s to 2m/s during minimum and peak demand respectively. Similarly, the high water age 72 to 146 hours was simulated. Based on the assessment results, the potential vulnerable area in the zone was discovered and the improvement was done by redesigning the system and coupling it with leakage control practices. The improvement result showed 86% of nodes and 77.29% pipes achieved the pressure and velocity requirement during peak demand respectively while the water age was reduced to 56 to 78 hours. The improvement strategies used to decrease water loses by accelerating the procedures to fix and repair leakages. Thus, geospatial and hydraulic model integration approach is significant tool to enhance nonrevenue water management by diagnosing network, exploring and predicting the future challenges and solutions.en-USIntegrated ModelHydraulic AnalysisNRW ManagementWater AgeWater Distribution SystemThesis