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SECTION 14 <br /> GENERAL DESIGN DATA <br /> 14.01 GRAVITY SEWERS <br /> A. A manhole shall be constructed 20 feet upstream of the lift station. There shall <br /> be only one pipe connection from the manhole to the lift station. The pipe <br /> between the lift station and the manhole shall be C-900 PVC, DR18 pipe. <br /> B. All sanitary sewers shall be constructed as required by the IRCDUS. Design to <br /> be done according to Recommended 10 State Standards for Wastewater <br /> Facilities, latest edition, and current regulatory agencies requirements. <br /> C. Gravity sewers shall be designed for estimated peak flow at ultimate <br /> development, which shall be the product of a selected peaking factor and the <br /> projected or known average daily flow at ultimate system development. <br /> D. Projections of average daily flow shall be made using a per capita sewage flow of <br /> 100 gallons per day and in accordance with Indian River County ordinances. <br /> Peak hour (design) flows shall be estimated using a peaking factor as outlined <br /> within Recommended 10 State Standards for Wastewater Facilities, latest <br /> edition. <br /> E. All sewers shall be sized to provide ample capacity for peak design flows. The <br /> fir► minimum allowable pipe size shall be 8-inch for collection lines and 6-inch for <br /> service laterals. Sewers shall be designed at slopes providing minimum <br /> velocities of 2 feet per second when flowing full or half-full, using a Manning's <br /> Roughness Coefficient (n) of 0.013 for ductile iron pipe and 0.012 for polyvinyl <br /> chloride pipe. In general, the following minimum slopes shall be provided for <br /> sewer sizes 8-inch to 36-inch or approved by IRCDUS: <br /> Pipe DIP PVC <br /> Diameter(inches) n = 0.013 n = 0.012 <br /> 8 0.40% 0.34% <br /> 10 0.28% 0.24% <br /> 12 0.22% 0.19% <br /> 15 0.15% 0.13% <br /> 18 0.12% 0.10% <br /> 21 0.10% 0.09% <br /> 24 0.08% 0.07% <br /> F. Manholes shall be installed at the end of each line, at all changes in grade, size <br /> or alignment, at all junctions (excluding service laterals) and at distances no <br /> greater than 400 feet apart. <br /> G. Sewer laterals shall not be connected directly into manholes unless approved by <br /> IRCDUS. IRCDUS will direct industrial wastewater into manholes on case-by- <br /> case basis. <br /> 14 - 1 1 �3.d•a <br />