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Excerpt from Temperature Prospecting for Shallow Glacial and Alluvial Aquifers in Illinois Walker, Bergstrom, and Walton (1965) reported water temperatures ranging between 53 Degrees and 57 Degrees F and C) and averaging 55 Degrees F C) in the Havana region of Illinois, in areas unaffected by river infiltration. The mean annual air temperature of this region is about 51 Degrees F C). A tabulation of the data presented by Hanson (1950, 1958, 1961) for munici pal water supplies in the east-central region of Illinois shows the water tempera tures from wells 50 to 400 feet deep to range from to F to C), averaging F C). The approximate mean annual air temperature at champaign-urbana is 52 Degrees F (11. 2 Degrees C). A linear regression line drawn through the data for east-central Illinois (fig. 1) suggests a gradient of F per 100 feet (2. 73 C per kilometer), although an argument could be made for a higher gradient by ignoring the points less than 100 feet and greater than 300 feet deep. However. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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