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411 5 .0 Conveyance Requirements <br /> Conveyance structures (outfalls, pipes, swales ditches, culverts, <br /> etc . ) shall be designed in accordance to the Mooresville <br /> Stormwater Design Manual to fulfill the following requirements : <br /> 5 . 1 Outfalls - All proposed pipe outfalls shall have an <br /> adequate receiving facility identified on the plans . <br /> 411 There shall be no increase in erosion and sedimentation <br /> on adjoining properties . <br /> 5 .2 Pipe Systems - All pipe systems shall accommodate the <br /> 10-year storm event with the hydraulic gradeline in the <br /> crown of the pipe. In addition, an overflow route to <br /> the detention structure shall be provided for the flows <br /> resulting from storms with a return period greater than <br /> the 10-year. In situations where an overflow route to <br /> the detention structure cannot be created, the pipes <br /> shall be designed with the 100-year hydraulic gradeline <br /> runoff below the top of casting or provide an easement <br /> encompassing the 100-year inundated areas . <br /> 5 . 3 Inlets - Inlets shall be located to limit gutter spread <br /> during the 10-year storm event such that one lane, <br /> based on the roadway width, is open. Multi-lane <br /> roadways shall maintain one clear driving lane in both <br /> directions . Inlets shall have the capacity to <br /> accommodate the 10-year storm or the 100-year storm <br /> where overflow channels are not provided. <br /> 5 .4 Culverts Culverts under roadways designated as <br /> thoroughfares, arterials or that provides the only <br /> means of ingress and egress to developments, shall <br /> accommodate the 100-year flow to the culvert without <br /> overtopping the roadway. <br /> 5 . 5 Culverts under collector roadways (those roadways <br /> connected to designated thoroughfares and arterials) <br /> shall accommodate the 50-year flow to the culvert <br /> without overtopping the roadway. <br /> 5 . 6 All other roadway culverts shall accommodate the 25- <br /> year flow to the culvert without overtopping the <br /> roadway. <br /> 5 . 7 Driveway culverts shall accommodate the 10-year flow to <br /> the culvert without overtopping the driveway. <br /> 5 . 8 Lift Stations - Lift stations shall not be designed as <br /> part of a stormwater conveyance system. Proposed <br /> MOORESVILLE STORMWATER MANAGEMENT ORDINANCE <br /> 19 <br />