Admin Order 58-16-01 - Laserfiche WebLink

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c. Joint deflections shall not exceed pipe manufacturer's recommendations. 3. Manning's Roughness Coefficient ("n" Value) "n" value for PVC and HDPE pipe shall be 0.010. "n" value for concrete pipe shall be 0.013. "n" value for metal pipe is specified in Appendix I. 4. Materials Wastewater pipe designed for open channel flow shall be PVC or ductile iron. Wastewater pipe designed for pressurized flow may be PVC, ductile iron or solid wall HDPE. Pipe networks in streets shall be, designed parallel to street centerlines whenever possible. Skewed pipe alignments are discouraged. 5. Buoyant Forces The effect of buoyant forces shall be checked for all pipes used below the normal water table. Buoyant forces shall not be greater than the weight of the pipe and backfill. F. Pump and Lift Station Design Public pump and lift stations must be identified in the City's Wastewater Master Plan or otherwise deemed appropriate by the City. Pump and lift stations require specialized planning, engineering and specifications not specifically addressed in detail by this manual or the Standards and Specifications. Stations shall meet the specific design and maintenance requirements of the City of Eugene in addition to the basic requirements of the Department of Environmental Quality (DEQ) pump station design regulations available at www.deg.state.or.us. Consultants must be experienced in the design and construction of large (1 MGD +) sewage lift stations. An interdisciplinary team is expected to address the multiple disciplines necessary to design and deliver the station. A pre -design report that outlines the scope of the project from design through construction is required and shall be approved by the City of Eugene. The pre -design report shall include, but not be limited to, the following information: Public Improvement Design Standards Manual, 2016 Page 2-48