.. The artesian waters of northeastern Illinois . e shut down for nearly 5 hours and measurements made atfrequent intervals during this period. The rising curves obtained aresimilar to those of 1910, which place the static head at approximately 102feet above city datum; this is for the wells at the pumping station. It was found that the specific capacity, or the yield under one foothead, of the Potsdam wells had decreased greatly since 1891. This isshown by the following table by Prof. C, S. Slichter contained in the1910 report of the Rockford water commission. Professor Slichter does not cons
.. The artesian waters of northeastern Illinois . e shut down for nearly 5 hours and measurements made atfrequent intervals during this period. The rising curves obtained aresimilar to those of 1910, which place the static head at approximately 102feet above city datum; this is for the wells at the pumping station. It was found that the specific capacity, or the yield under one foothead, of the Potsdam wells had decreased greatly since 1891. This isshown by the following table by Prof. C, S. Slichter contained in the1910 report of the Rockford water commission. Professor Slichter does not consider that the reduction in specificcapacity is entirely due to the mechanical clogging of the water-bearingsandstone in the vicinity of the wells. He believes that much of theclogging is because of the growth of low forms of plant life in the poresof the rock in the walls of the well, supported by the carbon dioxideliberated as a result of the reduction in pressure. 232 AETESIAN WATERS OF NORTHEASTERN ILLINOIS Specific capacity of Rockford wells. a The amounts deducted from heads are the approximate losses of head due topipe friction. b Including- St. Peter sandstone. c Deducting for St. Peter sandstone. APPENDIX Mineral and Boiler Analyses ofThe Artesian Waters of Northeastern Illinois 234 ARTESIAN WATERS OF NORTHEASTERN ILLINOIS Table I.—Mineral analyses of underground County Town Owner Depth of well feet Depth of casing feet Rate of pumping. gals, per sample was collected BooneBelvidere 1,800Oct. 2l! 13 Cook Barrington (Waterworks) Village 315 200 400 Aug. 24, 14 Cook Bellewood (Waterworks) Village 1,53887200July 7, 14 Cook Chicago (Armour powerhouse, U. S. yards) Armour & Co. 1,581To bed rock 1,000July 20, 14 Determinations made Potassium Sodium Ammonium Magnesium Calcium Iron Alumina Nitrites Nitrates Chlorine Sulphate Silica Hydrogen sulphide Manganese Bases .2 .07 .2 .3 24.
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