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<br />Page ]8 <br /> <br />4) Storm Runoff in Streets: The primary use of streets is for traffic. <br />The allowable gutter flow in streets shall not exceed the values <br />given in Figure 12 unless the allowable gutter flow is determined <br />using Figures 14 and 15. The use of streets for storm runoff shall <br />be limited by the criteria in Table VII. The allowable flow in the <br />gutter shall be limited to the gutter capacity multiplied by the <br />factor from Figure 15. The reduction factor is included in Figure <br />12 and should not be applied to values obtained from Figure 12. <br /> <br />5) Inlets Inlet design shall be in accordance with USDCM. Curb open- <br />ing inlets shall be utilized in the design of storm sewer systems. <br />For slopes up to 5 percent, the use of depressed curb opening inlets <br />shall be used. For steep slopes (over 5 percent), curb opening <br />inlets with deflectors in the gutter adj acent to the curb opening <br />shall be used. For details, see design standards No. 19 and 20 and <br />20A in the Engineering Regulations, Construction Specifications, and <br />Design Standards. <br /> <br />6) Storm Sewers Final grades, street geometrics, types of construc- <br />tion, and all other street details relative to the design, construc- <br />tion, or operation of the storm sewer system must be approved by the <br />City Engineer. <br /> <br />Storm sewers shall be constructed of reinforced concrete or corru- <br />gated aluminum pipe meeting current Colorado Department of Highways <br />Specifications. A minimum of class III concrete pipe will be re- <br />quired. <br /> <br />The minimum pipe diameter of storm sewers shall be 15 inches. <br /> <br />Storm sewers shall usually be straight between manholes. <br />radius curves are permitted for pipe diameters equal or larger <br />24". The radius of curvature shall not be less than 100 feet. <br /> <br />Long <br />than <br /> <br />Spacing of manholes shall conform to Table VIII. Manholes shall <br />conform to design standards No. 29 through 39 in the Engineering <br />Regulations, Construction Specifications and Design Standards. <br />