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Title: Investigation of relief wells, Mississippi River levees, Alton to Gale, Illinois
Authors: United States. Army. Corps of Engineers. St. Louis District.
Montgomery, Raymond L. (Raymond Lowree)
Keywords: Levees
Mississippi River Levees
Flood control
Flood protection
Relief wells
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: Pumping tests, chemical and biological analyses of water samples, and well screen inspection by means of a borehole TV camera were conducted in 1969 as part of a study of the efficiency of the relief well system along the Mississippi River between Alton and Gale, Illinois. The purposes of this study are to determine the extent and causes of well deterioration and to investigate methods for improving and maintaining the efficiency of the well system. The relief wells were designed by personnel of the U.S. Army Engineer Waterways Experiment Station and built under the supervision of the U.S. Army Engineer District, St. Louis (SLD). The wells included in this investigation were installed between 1953 and 1955. Since then, SLD has performed a series of well pumping tests, periodically inspected the relief well system, and observed the operation of the wells during high river stages of the Mississippi River. Results of the pumping tests indicated that the efficiency of the wells was decreasing at a rapid rate. Results of the 1969 pumping tests indicated that the average corrected specific yields for 24 test wells had decreased 33 percent since installation. All but one of the test wells had experienced reductions in specific yield. The largest reduction amounted to 56 percent of the initial specific yield. The rate of sand infiltration during pumping of four wells and the amount of sediment in each test well before and after pumping indicated that the wells were stable with respect to infiltration of the aquifer sands through the filter and well screen. Chemical and biological analyses on well water samples indicated high carbonate hardness and dissolved iron and the presence of iron- and sulfate-producing bacteria. The well water was generally too turbid for effective use of the borehole TV camera, but it is believed that incrustation may be a major factor in the reduction of specific yields in the wells.
Rights: Approved for public release; distribution is unlimited.
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