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SECTION 11 <br /> GENERAL DESIGN DATA <br /> 11 . 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 SDR-26 or C-900 PVC 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 /> co 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 /> 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 Mannings <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 /> 11 - 1 <br />