File:Water Supply and Irrigation Papers of the United States Geological Survey (1905) (14596692597).jpg

Identifier: watersupplyirrig114unit (find matches)
Title: Water Supply and Irrigation Papers of the United States Geological Survey
Year: 1905 (1900s)
Authors: United States Geological Survey
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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surface. Farther south the surface sandand gravel are generally restricted to the valleys of the main drainagelines. PI. XVI indicates the relation of the drift to the wells. It showsthe areas in which wells are obtained almost wholly from the drift,areas in which drift and rock wells are each used extensively, andareas in which it is generally necessary to go into the rock to obtainwater. There are many weak wells within the areas of thick drift,but in the great majority of cases farmers have penetrated to water-bearing beds or veins, which afford an adequate supply. LOCALITIES FAVORABLE FOR ARTESIAN WELLS. Artesian wells as here discussed include only wells which overflow,whether from the rock or from the glacial formations. It should beunderstood, however, that a large number of wells not classed as arte-sian are under the same hydrostatic pressure as those that flow andthe water rises to a similar altitude above sea level. U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER NO. 114 PL. XVI
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LEGEND #3 Unglaciated Paleozoic2a (wells in rock) Unglaciated Tertiary(wells in sand or gravel) t ■ . -: j Drift, 10-50( - - j (best wells i feetusually in rock) Drift. 25 - 75 feet (.wells frequently enter rook) Drift, 100 feet or more(wells seldom enter jock) 40 50 60 70 miles MAP SHOWING THICKNESS OF DRIFT IN ILLINOIS. ILLINOIS. 253 1 WO COA/S/H f> fLATTEWLLE ffOCH IS CAN o MOMMOUTH The artesian wells obtained from the several rock formations innorthern and western Illinois must generally be situated on groundless than 700 feet above sea level, for it is well established that waterwill not rise above that height, except inthe extreme northern part of the State orin localities where the greater head is ob- * ■tained from drift formations, which consti-tute the main source of supply for the ;wells. In southwestern and southern Illi-nois the ground must be considerably lower (than in northern and western Illinois toobtain a flow. In the latitude of St. Louis,and south from ther

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