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River Islands Development at Lathrop November 2020 <br /> Final Phase 2 Sewer Technical Report Rev 1 #6520 <br /> Table 4-2: Minimum and Maximum Pipe Velocities <br /> Value <br /> Parameter (fps) <br /> Minimum Pipe Velocity @ Pipes Half Full 2.0 <br /> Maximum Pipe Velocity 10.0 <br /> Notes: <br /> 1. From Section 5-4 in the 2019 City Standards <br /> Table 4-3: Minimum Pipe Slopes <br /> Pipe Size Minimum Slope <br /> (inches) (ft/ft) <br /> 8 0.0035 <br /> 10 0.0025 <br /> 12 0.0020 <br /> 15 0.0015 <br /> 18 0.0012 <br /> Notes: <br /> 1. From Table 5-1 in the 2019 City Standards. <br /> Kings method was utilized for determining the velocity of each pipe segment under PWWF. The Kings <br /> Method expands manning equation by providing a variable "K" which correlates the uniform depth of flow <br /> to the pipes current flow rate. When solving for K the depth of flow in each pipe can be determined. <br /> Q = K d 8/3$1/2 <br /> n <br /> Where, <br /> Q—Volumetric flowrate (PWWF in this model), cfs <br /> K- Kings variable for circular channels given in King's Handbook Tables -13 and 7-14. (see Appendix C). <br /> Kings variable is a relationship between the pipe current flow rate and it depth of flow(i.e. Depth/Diameter) <br /> n— Manning coefficient <br /> d— Insider diameter of the pipe, ft <br /> S—Slope of the Pipe, ft/ft. If improvement plans or as built drawings are not available (see Section 5.2 for <br /> further details), then the minimum required pipe slopes are used. <br /> 15 <br />