Spatial Distribution of Quaternary Sediments in Nebraska (OFR-76)

Spatial Distribution of Quaternary Sediments in Nebraska, Joshua Rupiper, Xun-Hong Chen, Leen-Kiat Soh and Ashok Samal, 2006(OFR-76). Since 1930, the Conservation and Survey Division of the University of Nebraska and the U.S. Geological Survey have been drilling test holes throughout the state of Nebraska. One purpose of this drilling is to characterize the spatial variation of the shallow aquifer systems in Nebraska. These aquifer systems consist of various types of lithologic units, including sand/gravel and silt/clay layers. 1.2 The Importance of the Test Hole Dataset This work is motivated by three factors. From a purely scientific standpoint, analysis of the data taken from the test holes can provide a better understanding of the sedimentary structures in these aquifers. This report specifically deals with creating a visual display of the lithology of Nebraska, building more ways and means in which the data can be used. The second reason involves future applications. There are three practical hydrologic applications that could come out of analyzing this dataset as a geographic information layer. •By identifying sediment composition in an area, the range of hydraulic conductivity and water storage levels can be approximated for certain key areas of Nebraska. The depth to groundwater measurements may be used to supplement other datasets such as the U. S. Geological Survey’s. •By comprehensively studying the test hole data, physical compositions of the sediments and the spatial patterns of aquifer and aquitard units may be found that were not previously known. These patterns can then be integrated into management plans and expectations. 13 pp. Size 8.5" x 11". Out of print, unbound copy available.