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SECTION 11 r <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 r <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 /> 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. r <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 /> r <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 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 r <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% r <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 /> r <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- r <br /> case basis . <br /> r <br /> 11 - 1 <br />