C153664 Feasibility Study - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I physiographic province. Topography in the county is generally flat to broadly rolling, The master planning area is in the South Platte River Basin, with the river flowing along the western boundaries of the City. Most of the land surface in the master planning area is fairly flat, with elevations ranging from approximately 4,870 feet above mean sea level (msl) to about 5,060 feet msl. The eastern and central portion of the master planning area containing the developed areas of the City is relatively flat. The western part of the master planning area has relatively few developed areas and has a steeper slope. The land slopes down toward the South Platte River, which is in the west-central part of the master planning area. The 100-year flood plain for the South Platte River is shown on Figure 2-3. The flood plain contains swamps, oxbow lakes, abandoned meander scars, and low distinct terraces. Generally, the flood plain is north and west of the river and is bounded by two separate terraces, which gradually slope towards the river. The terraces have distinct escarpments, which separates them from the flood plain and each other. The Kuner Terrace is the lower terrace, is approximately 10 to 15 feet above the river's flood plain, and is discontinuous on both sides of the valley. The Kersey Terrace is the upper terrace, underlies the City, has a broader and flatter surface, and is a significant feature of the valley. The Kersey Terrace is approximately 20 to 40 feet above the flood plain. The Kersey Terrace deposits, which underlie the City, are from the Quaternary period and are unconsolidated clay, silt, sand, and gravel. In the Fort Lupton area, approximately 5 feet of brown, loamy soil is above the Kersey Terrace deposits. The Kersey Terrace deposits underlying the City are made up of approximately 40 to 45 feet of medium- to coarse-grained sand and gravel with some pebbles, A distinct layer of orange, medium- to coarse-grained sand about 5 to 10 feet thick is found about 5 to 10 feet below the surface. The lower edge of the Kersey Terrace deposit is delineated by a layer of rounded cobbles approximately 2 feet thick. Below the Kersey Terrace deposit is the Denver Formation, consisting of clay, soft shale, and siltstone with significant quantities of carbonaceous material. Land use within the developed portions of the City consists of residential, commercial, and light industrial elements along with City parks, roads and railroads, and utility and public rights-of-way, There is some agricultural land and vacant land within the City limits as well. Figure 2-4 shows current land use within the Fort Lupton area, 25325,100; 12107194 2-2 ,-