Abstract
Chicago has a population of 3,520,000 people, an area of approximately 211 square miles, and is in general of rectangular subdivision. It varies in elevation from plus 7 feet above the Lake to plus 90 feet. About ten square miles in area are above plus 60 feet, and these are in the extreme northwest and southwest corners of the city area. The elevation varies from plus 7 to plus 20 feet from the Lake to about 6 miles west, and this area is about 80 percent of the total. From this it is seen that with regard to elevation the pressure problem in water supply is quite simple. The water supply system of 3700 miles of mains is of the gridiron type, with 8-inch supply mains and additional 12-inch or 16-inch mains each half mile, and feeder mains approximately one mile in each direction. The discharge feeders from each pumping station are inter-connected. The feeder mains range from 54 to 24 inches in size.
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