Abstarct: Today, with the expansion of cities and the development of urbanization, sewage collection and disposal networks are considered as vital urban infrastructure facilities. Due to the high cost of implementing wastewater collection and disposal networks for the optimal operation of these facilities and increase their useful life, the use of appropriate software technologies is an inevitable necessity. Hydraulic and qualitative modeling of the network is one of the technologies that can create knowledge of the hydraulic behavior of the network and its facilities for the operation team and thus contribute to the proper operation of the facility. The city of Tehran needs one of the widest sewage networks in the region, and District 4 of Tehran is the most populous region of Tehran. In this research, hydraulic and qualitative modeling of the sewerage network of this area of Tehran has been done with the help of advanced SewerGEMS software in ArcGIS software environment. Information laxyers of collection facilities including sewage pipelines and manholes and basic information laxyers including digital model of land, passages and subscribers were used to build the model. To calculate the node loads, the consumption information of the subscribers of the Water and Sewerage Company was used and the per capita water consumption and consequently the per capita wastewater production were calculated. The modeled sewage network has 6077 manholes and 338 km of pipes in different diameters including 221 km of 200 and 250 mm diameters (65% of the total network area) and 117 km of 300 to 1800 mm diameters (35% of the total network area). The results of hydraulic analysis performed with SewerGEMS software show that in most of the network, the flow rate parameter is not provided as one of the effective hydraulic parameters. About 25% of the total network pipes (84 km) flow rate is less than the desired wash rate (0.75 m / s), 40% of the pipes (136 km) between 0.75 to 1 m / s , 20% of pipes (66 km) are between 1.5 and 2 meters per second and 15% of pipes (52 km) are more than 2 meters per second. Analysis of the percentage of filling of pipes shows that about 70 km of pipes (20% of the total network) have excessive filling, so that 55 km of the network in the diameters of 200 and 250 mm has a filling percentage of more than 50%, 9 Kilometers with diameters of 300 and 375 mm have a filling percentage of more than 65% and the other 6 km have a filling percentage of more than 70%. Analysis of the potential for the production of destructive hydrogen sulfide gas as one of the most important causes of corrosion and severe reduction of the life of concrete pipes and installations was also performed. For this purpose, using SewerGEMS software, potential points for hydrogen sulfide production were identified and using correlation relationships, the rate of hydrogen sulfide production in sewer pipes and the concentration of hydrogen sulfide produced were estimated. And wastewater were compared. Z-index analysis to determine the points with high potential for sulfur dioxide production and corrosion susceptibility indicates adequate compliance of this index with field measurements.