Ordinance 03-2024 Stormwater Management Ordinance

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with the submission, No structures shall be located in a FEMA or DNR designated floodway. No structures shall be located within the floodplain of drainage basins less than one (1) square mile unless a floodway determination is conducted. The lowest finished floor of all Structures located within a flood plain shall have a two (2) feet flood protection grade (FPG) with respect to the lowest floor of the structure. 8,0 Water Quality For new development areas that disturb 10,000 sq. ft. or more acre of land, , structural BMPs shall be designed to meet water quality requirements as detailed in the Mooresville Stormwater Design Manual. Water quality BMPs are not required for the following projects; (1) Land -disturbing activities where there will be no additional impervious surfaces associated with the final completed project. (2) Single-family residential strip development offered for sale or lease without land improvements and the project is not part of a larger common plan of development or sale. (3) Individual residential building lots within a permitted project site, (4) Residential developments consisting of four (4) or fewer lot developments where the proposed impervious surfaces are 10% or less of the project acreage. Impervious is determined by the sum of all infrastructure (roads, paths, parking, etc,) and the average projects hard surfaces associated with all building lots within the project. (5) Single family residences and private ponds that are not part of a larger common plan of development or sale. Water quality considerations shall be incorporated in the submitted SWMPs and specifications in accordance with the Mooresville Stormwater Design Manual to fulfill the following requirements: 8.1 Pretreatment Requirements — Every stormwater treatment practice shall have an acceptable form of water quality pretreatment, in accordance with the pretreatment requirements found in the current Mooresville Stormwater Design Manual. Stotmwater infiltration practices, or practices having an infiltration component, as specified in the Mooresville Stormwater Design Manual, are prohibited, even with pretreatment, in the following circumstances: (A) Where stormwater is generated from highly contaminated source areas as identified by the IDEM, USEPA, or the PWO; (B) Where stormwater is carried in a conveyance system that also carries contaminated, non-stonnwater discharges; (C) Where storatwater is being managed in a designated groundwater recharge TOWN Or, MOORESVILLE STORMWATER MANAGEMENT ORDINANCE 20 130