8.1. SR 11-04-2013 - Laserfiche WebLink

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SECTION 2 Atlas 14 website as well as additional rainfall data and climatological information for the area http://dipper.nws.noaa.gov/hdsc/pfds/. 2.5. Soils The Elk River Moraine Complex is visible on the islands of till that project through the sand plain of northeast Elk River. More information about soils can be obtained from the Soil Survey of Sherburne County. Refer to Figure 4 for a map illustrating soil types and locations throughout the City. Infiltration capacities of soils affect the amount of direct runoff resulting from rainfall. The higher the infiltration rate for a given soil,the lower the runoff potential. Conversely, soils with low infiltration rates produce high runoff volumes and high peak discharge rates.According to the soil survey,most of the underlying soils in the City of Elk River are classified as Type A soils with high infiltration rates even when thoroughly wetted. These soils consist chiefly of deep, well drained to excessively drained sands and gravel. These soils have a high rate of water transmission,therefore resulting in a low runoff potential. Type A soils as indicated by the soil survey,are found along Highway 10 and 169 corridors spanning the City from east to west and north to south. The soil survey also indicates Type B soils which have moderate infiltration rates consisting of deep moderately well to well drained soils with moderately fine to moderately coarse textures. Type D soils that have a very slow infiltration rates that are typically clay soils with high swelling potential at or near the surface or shallow soils over nearly impervious material.Type B and Type D soils are found mainly along the eastern half of the City with small clusters in the northwestern and western areas of the City. Since the City of Elk River has growth and development opportunities, future land grading is likely to occur within the City. 2.6. Land Use Elk River contains over 25,000 acres,with majority of the developed area located in the southern portion of the City. 58%of the City's existing land use is vacant with 14%rural residential(low density residential). Medium and high density residential land uses comprise roughly 10% of the city's useable land. Commercial development occupies 1%of the City's land area,and industrial land uses occupy 3% of the City's total land area. Parks and open space occupy 7%of the City's total land area. Land use data is an important factor for estimating surface water runoff.The hard or impervious surface areas associated with each land use greatly affect the amount of runoff generated from an area.Future land use projections indicate those areas that may be available for water resource enhancement and where improvements should be a priority. Significant changes in land use can increase runoff due to added impervious surfaces. Refer to Appendix D for the existing and proposed land use figures from the City's Comprehensive Plan. Surface Water Management Plan City of Elk River Section 2 WSB Project No.1992-030 Page-2