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Map 3A indicates that there are areas in Champlin with severe soil limitations. <br />According to the Hennepin County Soil and Water Conservation District these <br />areas are subject 'to flooding or have a high water table for at .least a part <br />of the year. Most of the areas with severe soil problems are outside the flood <br />plain. Development in the areas must meet established requirements. <br /> <br />High ground water levels present problems in areas without public utilities. <br />Champlin requires septic system filter fields to be at least 3 feet above <br />the water table. It is important that appropriate percolation rates be <br />adopted as part of the local ordinance since excessive percolation may allow <br />contamination of ground water, while slow percolation may result in effluent <br />rising to the surface and overflowing. <br /> <br />Sandy soil is another characteristic which the CAR communities have in common <br />in the Critical Area corridor. Map 3A identifies shoreline erosion, and if <br />proper precautions are not taken, serious erosion problems could result. <br /> <br />FLOOD PLAINS <br /> <br />The State of Minnesota adopted the Flood Plain Management Act in 1969. <br /> <br />The Act requires all local units of government to adopt, enforce, and <br />administer a Flood Plain Ordinance. The Flood Plain Act was in response to <br />growing concern over the financial and personal losses resulting from floods. <br /> <br />Flood plains of rivers and streams were originally formed by nature resulting <br />from flood flows during excessive snow melt or rainfall. There have always <br />been floods, but prior to man there were no flood problems. Over a period of <br />time, as more and more development occurred in or along the flood plain, flood <br />heights and velocities increased which resulted in an increase in economic <br />losses. <br /> <br /> -11- <br /> <br /> <br />