عنوان مقاله [English]
نویسندگان [English]چکیده [English]
One of the most important challenges in urban management is collection and transmission of sewage to outside of cities and villages boundaries. According to allocation of 70-90 percent of a swage plan’s total costs to sanitary sewer network and transmission, investigation of usages of different unconventional sanitary networks due to lower costs of these networks in comparison with other conventional ones is necessary at national level. The unconventional sanitary sewer networks in small urban and rural communities include pressure sewer system (PSS), vacuum sewer system (VSS), small diameter gravity sewer system (SDGS) and simplified sewer system (SS), They are selected in accordance with specific circumstances of a region such as social, economic, regional, technical and other effective elements. In the current research, the data are collected from books, consulting engineering companies reports, and national and international standards of sewer network systems and then different sanitary sewer networks and their usages are investigated and compared in order to select the optimum sewer network with emphasis on lower administrative, operation and maintenance costs.