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<br />community storm water management facilities designed to serve multiple land disturbing and <br />development activities undertaken by one or more persons, including the applicant. <br /> <br />Subdivision 2. All calculations and information used in determining these peak storm <br />discharge rates shal1.be submitted along with the storm water pollution control plan. <br /> <br />Subdivision 3. The applicant shall consider reducing the need for storm water , <br />management facilities by incorporating the use of natural topography and land cover such as <br />natural swales and depressions as they exist before development to, the degree that they can <br />accommodate the additional.flow of treated (e.g., settled) water without compromising the <br />integrity or quality of the wetland or pond. (Commentary: The sensitivity of a wetland to <br />degradation varies with the type of vegetation. Sedge meadows, open bogs and swamps, <br />coniferous bogs, calcareous fens, low prairies, lowland hardwood swamps, and seasonally <br />flooded basins are highly sensitive to degradation. Flood plain forests, reed canary grass <br />meadows, shallow (reed canary grass, cattail, giant reed or purple loosestrife) marshes are only <br />slightly sensitive to degradation. See the current version of the Minnesota Pollution Control <br />Agency's publication "Storm-Water and Wetlands: Planning and Evaluation Guidelines for <br />Addressing Potential Impacts of Urban Storm-Water and Snow-Melt Runoff on Wetlands" for <br />details. ) <br /> <br />Subdivision 4. The following storm water management practices must be investigated in <br />developing the storm water management part of the storm water pollution control plan in the <br />following descending order of preference: <br /> <br />A. Protect and preserve as much natural or vegetated area on the site as <br />possible, minimizing impervious surfaces,. and directing runoff to vegetated <br />areas rather than to adjoining streets, storm sewers and ditches. <br /> <br />B. Flow attenuation of treated storin water by use of open vegetated swales and <br />natural depressions; <br /> <br />C. Storm water wet detention facilities (including percolation facilities); and <br /> <br />D. A combination of successive practices may be used to achieve the applicable <br />minimum control requirements specified in subsection (A) above. The <br />applicant shall provide justification for the method selected. <br /> <br />9.27.12 Minimum Design Standards for Storm Water Wet Detention Facilities. <br />At a minimum these facilities must conform to the most current technology as reflected in the <br />current version of the Minnesota Pollution Control Agency's publication, "Protecting Water <br />Quality in Urban Areas" and the current requirements found in the same agency's NPDES <br />permits for storm water associated with construction activities. <br /> <br />9.27.13 Minimum Protection for Natural Wetlands. <br /> <br />Subdivision 1. Runoff must not be discharged directly into wetlands without appropriate <br />quality (i.e., treated) and quantity runoff control, depending on the individual wetland's <br />vegetation sensitivity. See the current version of the Minnesota Pollution Control Agency's <br /> <br />Page 14 of2l <br />October 9,2006 <br /> <br />Storm Water Pollution Control Ordinance <br /> <br />26 <br />