Small Diameter Gravity and Pressure Sewersby James S. Gidley, West Virginia Univ, United States,
Abstract: In communities with low population density or physical features that make conventional gravity sewers inordinately expensive, alternative sewer technologies can be significantly lower in cost. In the past two to three decades, the alternative systems, including the grinder pump pressure sewer (GP), the septic tank effluent pump pressure sewer (STEP), the small diameter gravity sewer (SDG), and the vacuum sewer, have been developed and proven in operation at many sites. As of 1986, EPA had awarded construction grants for 136 GP systems, 72 STEP systems, 141 SDG systems, and 12 vacuum sewer systems. This paper deals with the SDG, STEP, and GP systems.
Subject Headings: Gravity sewers | Pumps | Septic tanks | Effluents | Population projection | Environmental Protection Agency | Construction management
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