Agenda - Planning Commission - 02/02/2006

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control plan, except for the emergency. If such a plan would have been required, then the disturbed land area shall be shaped and stabilized in accordance with the city's requirements as soon as possible. Ordinary High Water Mark - This is generally the boundary elevation where the vegetation changes from predominately aquatic (Where "aquatic" broadly means that the vegetation can survive moist conditions.) to terrestrial. This elevation delineates the highest water level, which has been maintained for a sufficient period of time to leave evidence upon the landscape, commonly that point where the natural vegetation changes from predominantly aquatic to predominantly terrestrial. Water often reaches this elevation in spring. For rivers and streams the ordinary high water mark is usually the top of the bank. It is less well defined for lakes and wetlands. The definition in Minnesota Statute 103G.005, subdivision 14 says that the ". .. "Ordinary high water level" means the boundary of waterbasins, watemourses, public waters, and public waters wetlands, and: A.) the ordinary high water level is an elevation delineating the highest water level that has been maintained for a sufficient period of time to leave evidence upon the landscape, commonly the point where the natural vegetation changes from predominantly aquatic to predominantly terrestrial; B.) for watercourses, the ordinary high water level is the elevation of the top of the bank of the channel; and; C.) for reservoirs and flowages, the ordinary high water level is the operating elevation of the normal summer pool.The term "ordinary high water mark" is further defined in Minnesota Rule 6120.2500, subpart I 1. Ordinary high water marks are determined by the Minnesota Department of Natural Resources' area hydrologist. Paved Surface - A constructed hard, smooth surface made of asphalt, concrete or other pavement material. Examples include, but are not limited to, roads, sidewalks, driveways and parking lots. Permanent Cover - Means "final stabilization." Examples include grass, gravel, asphalt, and concrete. Pervious Surface - A surface that permits the entry of water into the soil. Examples include lawns, planting beds and paving brick surfaces designed to infiltrate water into the underlying soils. Runoff Coefficient - The average annual fraction of total precipitation that is not infiltrated into or otherwise retained by the soil, concrete, asphalt or other surface upon which it falls that will appear at the conveyance as runoff. Sediment - The product of an erosion process; solid material both mineral and organic, that is in suspension, is being transported, or has been moved by water, air, or ice, and has come to rest on the earth's surface either above or below water level. Sedimentation - Means the process or action of depositing sediment caused by erosion. Draft StormWater Ordinance Page 4 of 20 January 20, 2006 89