Problem Set_05 - 1 Date Name Grader Grade GLG 411 Problem...

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Unformatted text preview: 1 Date ________________ Name __________________ Grader ________________ Grade _________________ ----------------------------------------------------------------------------------------------------------------- GLG 411 - Problem Set 5 Water-Table and Potentiometric Surface Required Materials: L Sharp pencil plus several colored pencils Materials Provided: L Figure 1: Red Cedar Basin, Michigan L Figure 2: Location of rock wells, Merdian Township L Figure 3: Location of Drift Wells, Meridian Township L Figure 4: Geologic Cross Section, Merdian Township L Figure 5: Surficial Geologic Map of Ingham County L Table 1: Elevation of potentiometric surface….. L Table 2: Elevation of water table….. L Table 3: Lithologic logs for wells R7 through R12 Purpose: 1.0 The purpose of this lab is to familiarize you with the construction and interpretation of water-table and potentiometric maps and to introduce you to the construction of geologic cross sections. The area that this lab will focus on will be Meridian Township (Figure 1) which lies in the western part of the Red Cedar basin, Michigan. The data in table 1 contains in the first two columns coordinates for 35 wells within the township that draw water from the Saginaw Aquifer. In the third column is information about the elevation of the potentiometric surface measured in the Saginaw Aquifer and column four is the code number for each well. The elevation of the potentiometric surface was obtained by subtracting the measured depth to static water-level in each rock well from the elevation of the well-head. The location of the 35 rock wells is shown in figure 2. The data in table 2 contains information about the elevation of the water table measured in the drift that directly overlies the Saginaw Aquifer. This information was obtained from static water-level measurements made in shallow drift wells as well as from measurements of the surface elevation of open water bodies (lakes and streams) and s wamps within the township. The source of the 2 data is represented by D, W, or S code numbers for wells listed in column four. Problems: 2.1 Using the data in tables 1 construct a contour map showing the potentiometric surface in the Saginaw Aquifer within Meridian Township. Set the contour interval for the potentiometric surface to 10 feet and the minimum contour to 775 feet. The gradient of the Saginaw Aquifer potentiometric surface in Meridian Township is generally in what general direction? __________ Provide two reasons why the potentiometric gradient is in that direction?______________________________________________ ______________________________________________________ In what part of the township is the gradient of the potentiometric surface the greatest?_____________________________________ surface the greatest?...
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This note was uploaded on 07/25/2008 for the course GLG 411 taught by Professor Larson during the Fall '06 term at Michigan State University.

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Problem Set_05 - 1 Date Name Grader Grade GLG 411 Problem...

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