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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Il!lil;;74 <br /> <br />channel were classified as Ay ( Aida-Loam), and Lx (Loamy Alluvial Sand). <br />The sOil along the western edge of the dashed area in Figure 4 was of the <br />Platte-Aida Complex type. The exact characteristics of this soil type were given <br />In Tables 6 and 7 of the Buffalo County Soil Map (1974). A summary of the <br />applicable portions of these tables is shown in Table 2. <br /> <br />Table 2: Platte-Aida Complex Soil Characteristics <br /> <br />Depth From Surface Soil Type Permeability <br />finches' finchesJhou;' <br />0-8 Loam 0.63-2.0 <br />8-17 Fine Sandy Loam 2.0-6.30 <br />17-60 Fine Sand to Coarse > 20 <br /> Sand with some Gravel <br /> <br />Permeability for each layer of the soil profile was required for <br />determination of one of two natural parameters required by the CSUPAW model. <br />transmissivity. Transmissivity is a parameter composed of a combination of the <br />permeability or hydraulic conductivity of the soil medium and the thickness of the <br />aquifer. Mathematically, the transmissiVity can be defined as: <br /> <br />T= KB <br /> <br />Where: T=Transmissivity in ft'/day <br />K=Permeability or Hydraulic <br />ConductiVity In ftJday <br />B=Aquifer Thickness 76 feet <br /> <br />With a depth of 1 foot for the recharge baSin. the top 12 inches of the SOil will be <br />removed. As a result. the transmissivity is most dependent on the highly <br />permeable third layer of fine sand to coarse sand. This is apparent when <br />determining the mean value for the permeability or hydraulic conductivity. A <br />mean value of K was determined to provide a value that was more <br />representative of a homogeneous aquifer. The following equation was used to <br />calculate the mean value of K: <br /> <br />16 <br />