Ordinance 03-2024 Stormwater Management Ordinance

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As-builts - As -built drawings shall be completed within 30 days after the completion of the project and submitted to the PWO. Electronic record drawings shall include a pdf file of the plans completed by a professional engineer or land surveyor with changes made during construction shall be marked on the as-builts in a contrasting color in order to easily see the revisions. 4.0 Detention Requirements Detention shall be required for SWMPA for all proposed projects that disturb 10,000 sq. ft, or more acre of land. In addition, detention may be required for any development in areas where downstream flooding has been identified by the Town. The following projects may complete a Runoff Curve Number Worksheet per the Mooresville Stormwater Design Manual, Upon PWO approval, detention requirements for the project shall be waived.; (1) Land -disturbing activities where there will associated with the final completed project (2) Single-family residential strip development improvements and the project is not part of a sale. be no additional impervious surfaces offered for sale or lease without land larger conuuon plan of development or (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. Pre- and post -developed nmoff rates shall be determined using methodologies specified in the Mooresville Stormwater Design Manual. The following requirements shall be fulfilled for all detention facilities; 4.1 The runoff from the developed condition peals storm with a 100 -year return period storm shall be limited to the runoff rate from the pre -developed condition peak storm with a 10 -year return period storm. 4.2 The runoff from the developed condition peals storm with a 10 -year return period storm shall be limited to the runoff rate from the pre -developed condition peak storm with a 2 -year return period storm. 4.3 There shall be no increase in the runoff rate from the pre -developed conditions to the post -developed conditions for all storms at all discharge points along the property line. 4.4 An adequate downstream receiving facility shall be identified on the plans and evaluated in the drainage report. There shall be no increase in erosion potential on TOWN OF MOORESVILLE STORMWATER MANAGEMENT ORDINANCE 17