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June 16, 2022 <br />101 <br /> <br /> <br />3. Velocities in open channels shall not be greater than the velocity which cause the following: <br />a. It neither aggrades nor degrades beyond tolerable limits. <br />b. The channel banks do not erode to the extent that the channel cross section is <br />changed appreciably. <br />c. Sediment bars do not develop. <br />d. Erosion does not occur around culverts and bridges or elsewhere. <br />e. Gullies do not form or enlarge due to the entry of uncontrolled stormwater runoff. <br />(i) Pipe Capacity, Materials and Placement <br />1. Pipe size shall be dictated by design runoff and hydraulic capacity. <br />2. In general, no pipe size in the storm drainage system shall be less than fifteen (15) inch <br />diameter. A twelve (12) inch diameter pipe may be permitted as a cross-drain to a single <br />inlet. <br />3. All discharge pipes shall terminate with a precast concrete or corrugated metal end section. <br />4. Storm sewers shall be constructed of reinforced concrete pipe (RCP) constructed according <br />to the material and method specifications set forth in the most recent version of the City of <br />Fargo’s Standard Specifications for Construction of Public Utilities, as it presently exists or <br />may hereafter be amended. Polyvinyl Chloride (PVC) may be for backyard runs and shall be <br />constructed according to the material and method specifications set forth in the most <br />recent version of the City of Fargo’s Standard Specifications for Construction of Public <br />Utilities, as it presently exists or may hereafter be amended. <br />5. The minimum depth of cover over concrete pipe shall be twelve (12) inches. <br />(j) Inlets, Catch Basin and Manholes <br />1. Inlets, catch basins and manholes shall be consistent with the material and method <br />specifications set forth in the most recent version of the City of Fargo’s Standard