1115.08 STORM WATER MANAGEMENT AND EROSION CONTROL.

   All storm water management and erosion control facilities shall comply with the requirements at the time of plan submittal of the current City of Norwalk Engineering Standards.

   (a)    Developer to Provide Complete Facilities. The developer shall provide the area within the proposed subdivision with facilities to ensure complete and adequate drainage as required by the Standards. All storm water runoff originating within the proposed subdivision shall be conducted to detention facilities within the subdivision and then discharged into natural receiving waters or watercourses in compliance with the Standards.

   (b)   Closed System Needed If No Curbs and Gutters. In proposed subdivisions in which curbs and gutters are waived, all roadside swales and ditches shall drain into a closed system.

   (c)   Easements Required for Storm Water Facilities. Any storm water management facility not contained within existing or proposed dedicated rights-of-way shall be contained within easements dedicated for inspection purposes as part of the subdivision plat; such easements shall be clearly shown on the plat.

The developer shall provide easements to allow for access by the City to only the inlet and outlet portions of any detention facility designed to permanently impound water. The developer shall provide the Public Works Director with provisions for the future maintenance of the actual detention facility. Such provisions must be acceptable to the Public Works Director before they shall be approved by the Planning Commission.

   (d)   Developer to Clean All Existing Open Channels. Existing open channels through the proposed subdivision shall be cleaned as necessary to allow for free and unobstructed flow of water through the subdivision. Existing open channels through the proposed subdivision shall also be cleaned to allow for free and unobstructed flow from existing and proposed storm sewer outlets. The determination will be made by the Public Works Director during the review of the construction drawings as to the extent of cleaning necessary.

   (e)   Soil Erosion Requirements. The developer shall not at any time cause or allow sediment from the proposed subdivision to be deposited into an open waterway, roadway or onto an adjoining property. Adequate controls of soil erosion and sedimentation, in compliance with the Standards, shall be used during all phases of construction.

   (f)   Design Requirements Specifications.

      (1)    The design and construction of all storm water management facilities shall comply with the requirements of the Standards and the Location and Design Manual, Volume 2: Drainage Design, of the Ohio Department of Transportation. Free-surface and open channel flow analysis shall use the Manning equation.

Closed storm water conduit located within public highway easements, road rights-of-way, and/or classified as main collector shall be reinforced concrete pipe of appropriate type as specified in ODOT Item 603, and, along with all other storm water facilities, materials, and appurtenances, shall conform to all other applicable Items as required by the ODOT Construction and Material Specifications.

      (2)   The City of Norwalk will address EPA regulations and mandates, and their updates through the Engineering Standards.

         (Ord. 2011-008. Passed 3-15-11.)