.. The artesian waters of northeastern Illinois . one. This generalization regarding the St. Peter does not hold forthe Stock Yards district. In drilling a recent well in this area, the surfacewater was carefully cased off to a depth of 500 feet and very little waterwas encountered until the St. Peter sandstone was reached. The waterthen rose to the general level of the Potsdam water in the Stock Yardsdistrict. This is apparently not the natural static head of the water fromthe St. Peter sandstone, because, as previously mentioned, in drilling deepwells in other parts of the city very little d
.. The artesian waters of northeastern Illinois . one. This generalization regarding the St. Peter does not hold forthe Stock Yards district. In drilling a recent well in this area, the surfacewater was carefully cased off to a depth of 500 feet and very little waterwas encountered until the St. Peter sandstone was reached. The waterthen rose to the general level of the Potsdam water in the Stock Yardsdistrict. This is apparently not the natural static head of the water fromthe St. Peter sandstone, because, as previously mentioned, in drilling deepwells in other parts of the city very little difference is noted between theground-water level and that of the St. Peter water. The surface ground-water holds the water level during drilling at about 50 feet, until a depthof from 1,200 to 1,400 feet is reached, when the level drops to a depthvarying between 150 and 235 feet, depending upon the part of the city inwhich the well is located. These latter figures indicate the head of thePotsdam water. 94 (ETESIAN WATERS OF NORTHEASTERN ILLINOIS. N U) P) 5 n * * * 3AOBV Nl NOIXVA313 95 •able watei\Chicago thisnt obtained>mpany wasafter pass-surface or:h had beenippears thatbe St. Peteriam group,:ained in thesome watermdstone be-likely to be3 have been ian water of*roup struckon Plate area ofmer of 1914I 212 or 214for the dis-t wells werevas probably914. A few0 feet during was at Park3 summer ofi of 565 feether than thathe south partthan that at any one welle water level, the measure-truct a curvehey flowed in>ince 1907, nowells of large 94 o 3 3 1 • ^ 5 §~ > COOK COUNTY 95 The St. Peter sandstone at one time contained considerable water,but tests made within the past few years indicate that in Chicago thissource of supply has been practically exhausted. The amount obtainedfrom this stratum in a test made by the Western Electric Company wasless than 20 gallons per minute. The water level in the well, after pass-ing through the St. Peter sandstone, was
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgroundw, bookyear1919
