2015-01-28 CC Packet - Laserfiche WebLink

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DRAFT 12/2/14 157.05. Design Standards Minimal Impact Design Standards (MIDS) shall be followed to achieve the best stormwater management. The BMPs used should seek to mimic the natural hydrology, utilize pervious areas for stormwater treatment and to infiltrate stormwater runoff from driveways, sidewalks,rooftops, parking lots, and landscaped areas to the maximum extent practical to provide treatment for both water quality and quantity. The Minnesota Stormwater Manual (MN Pollution Control Agency), the Minnesota Urban Small Sites BMP Manual (Metropolitan Council), Local Road Research Board BMP Maintenance Guide, and Protecting Water Quality in Urban Areas (MPCA) are resources that provide guidance in achieving these goals. (A) Implementation. Low Impact Development, Better Site Design, or Green Infrastructure design techniques are the preferred methods of achieving stormwater management. Mimicking the natural topography and land cover as they exist in the pre-developed condition to meet the standards and requirements of the City and other regulatory agencies shall be the first consideration. (B) Recommended Practices. Practices and methods used to achieve the intent of the above paragraph shall include,but not be limited to,the following: (1) rain gardens (2) green roofs (3) bio-retention practices (4) pervious pavements or pavers (5) plots of native vegetation and/or buffers in place of sod (6) reforestation and revegetation (7) trees and tree box filters (8) reduction of impervious area (9) rain water harvesting (C) Other Practices. Other traditional stormwater BMPs may be approved on a site by site basis to achieve the goals of water quality and quantity, and rate control. These practices shall conform to the standards outlined in the resources referenced above. (D) All stormwater runoff shall be pre-treated prior to discharge to any surface water. (E) Maintenance Plan. A plan shall be established to maintain all temporary and permanent BMPs in a working and efficient condition. This may include removal of invasive species, sediment, debris, or any other foreign or obstructive object or condition that prevents the BMPs from performing as designed. (F) Exemption. The mill and overlay or rehabilitation of a public roadway that does not create additional impervious surfaces; and sidewalk or trail projects are exempt from these stormwater requirements. These projects may be subject to other regulations. 157.06. Drainage Site alteration, grading, placement and installation of BMPs and other related activities shall be implemented in such a way that drainage from the site shall not exceed the pre-developed rates and will not adversely affect neighboring properties. 30