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A flat top of shallow cone shall be used when there is less than 5 feet of cover over a <br />pipe. <br />6. Watertight Manhole Covers <br />Watertight manhole covers shall be used when the cover is either below the 100 -year <br />flood plain or in a location where overland runoff or gutter flow or other concentrated <br />flows or water from ponding areas could enter the manhole. <br />D. Off -Site Flows <br />When land outside a new development will direct flow to wastewater systems in the new <br />development, the systems shall be public and constructed to one or more of the <br />development boundaries. The system shall be sized and located to accommodate all off- <br />site flows. Guidelines for the extension of the public wastewater system can be found in <br />the most current version of the City's Wastewater Master Plan. <br />E. Pipes <br />Pipes shall comply with the following: <br />1. Cover <br />4 feet of cover shall be provided over the top of the pipe from expected finish grade. <br />Where pipe cover is proposed to be less than 4 feet or more than 10 feet, the Design <br />Engineer shall provide documentation and/or design calculations to show that the <br />pipe is structurally adequate to withstand construction loadings and traffic 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. 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 two manholes provided there <br />is no vertical curve in that section; or, <br />b. A maximum of one (1) vertical curve is permitted between any 2 manholes <br />manhole. <br />Public Improvement Design Standards Manual, 2016 Page 2-47 <br />