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Abstract
Egypt is considered one of the developing countries with rural sanitation service coverage about 10% only. Conventional gravity sewers is the most commonly used rural sewerage system in Egypt. However, this system has some technical, economic, environmental, and social disadvantages. Vacuum sewers could serve as a good competitor as an alternative system to conventional gravity sewers. Sustainability analysis of both systems was made for economical, environmental and social aspects. For scientific economical analysis, a sample of 33 rural villages with population range up to 10,000 capita is selected from Egypt. A statistical analysis is done using SPSS and STATISTICA software where population and Area variables have the most significant effect on the calculation of annual investment, operation, maintenance, the total annual costs and other different cost component. Investment costs for the vacuum system is less than the conventional one, while operational and maintenance costs play significant roles. Prediction models were obtained based on multiple linear and regression models