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MNR100001 (CSW Permit) as now constituted and from time to time amended. <br />Post -Construction Stormwater Management <br />157.20 Stormwater Management Plan <br />(A) General Criteria. A stormwater management plan shall be required of all new development, <br />redevelopment and land disturbance projects greater than one (1) acre in parcel size or part of a greater plan of <br />development. This plan shall be designed to reduce and/or minimize the impervious area of the site, control the <br />peak flow rate, and minimize the volume of stormwater runoff from the same as required in the LSWMP and <br />this Code. Plans must be submitted to the City for review and approval prior to the start of construction. Each <br />project will construct, implement and maintain all best management practices (BMP) that are deemed necessary <br />to achieve the goals of this Chapter, including post -construction stormwater management BMPs. Prior to the <br />start of construction, all projects shall be in possession of any and all permits required for the project including, <br />but not limited to: <br />1. Rice Creek Watershed District, <br />2. City of Centerville, <br />3. U.S. Army Corps of Engineers, <br />4. National Pollutant Discharge Elimination System (NPDES), and <br />5. Wetland restoration or mitigation plan approval, <br />Projects smaller than one (1) acre in size are encouraged to implement BMPs that will <br />promote infiltration and contribute to improved water quality. The City reserves the right to require erosion <br />prevention measures to land -disturbing activities of less than one acre, when in the judgment of the City's <br />Public Works Director, the land disturbing activities are likely to result in discharge of sediment or other <br />pollution into the City's stormwater system, or into Waters of the State. <br />157.21 Design Standards. <br />Minimal Impact Design Standards (MIDS) shall be followed to achieve the best stormwater management. The <br />BMPs used should seek to mimic the natural hydrology, utilize pervious areas for stormwater treatment and <br />infiltrate stormwater runoff from driveways, sidewalks, rooftops, parking lots, and landscaped areas to the <br />maximum extent practical to provide treatment for both water quality and quantity. The Minnesota Stormwater <br />Manual (MN Pollution Control Agency), the Minnesota Urban Small Sites BMP Manual (Metropolitan Council), <br />Local Road Research Board BMP Maintenance Guide, and Protecting Water Quality in Urban Areas (MPCA) <br />are resources that provide guidance in achieving these goals. <br />(A) Implementation. Low Impact Development, Better Site Design, or Green Infrastructure design <br />techniques are the preferred methods of achieving stormwater management. Mimicking the natural topography <br />and land cover as they exist in the pre -developed condition to meet the standards and requirements of the City <br />and other regulatory agencies shall be the first consideration. <br />(B) Recommended Practices. Practices and methods used to achieve the intent of the above paragraph <br />shall include, but not be limited to, the following: <br />(1) rain gardens <br />(2) green roofs <br />(3) bio-retention practices <br />(4) pervious pavements or pavers <br />