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E. Off -Site Flows <br />Closed or piped drainage systems from lands outside the development site and having <br />flows through the new stormwater systems shall be "public" systems and constructed to <br />one or more of the development boundaries. The system shall be sized and located to <br />accommodate all pre and post development contributing off-site flows in accordance with <br />the City's Stormwater Master Plan. Guidelines for the extension of the public stormwater <br />system can be found in the City's Stormwater Master Plans. <br />Construction of public roadways or other improvements that alter historic drainage <br />patterns shall include the constriction of conveyance facilities to accommodate historic <br />drainage patterns. <br />F. Pipes <br />Pipes shall comply with the following: <br />1. Cover <br />A minimum 4 feet of cover shall be provided over the top of the pipe from expected <br />finish grade. Where pipe cover is proposed to be less than 4 feet or more than 10 feet, <br />the Design Engineer shall provide documentation and/or design calculations to show <br />that the pipe is structurally adequate to withstand construction loadings and traffic <br />loading. <br />Notwithstanding the above guidance, a CLSM cap shall be required where the top pipe <br />is within 2 feet of finished grade. <br />2. Diameter <br />The minimum pipe diameter shall be 10 inches for all stormwater drainage pipes. <br />3. Curves, Horizontal and Vertical <br />Horizontal and vertical curves are not permitted except in steep terrain, and then <br />only: <br />a. One horizontal curve is permitted between any 2 manholes provided there <br />is no vertical curve in that section; or, <br />b. A maximum of 2 vertical curves is permitted between any 2 manholes. <br />c. Joint deflection shall be no greater than pipe manufactures' <br />recommendations. <br />Public Improvement Design Standards Manual, 2016 Page 2-13 <br />