Chicago : Engineering and Contracting Pub. Co. · leaf 91
stance, in November and December, follow-ing the long drouth of summer, the total hard-ness of the river water rises to 400 or 450parts per million, but when the spring rainsfall the storm waters dilute the hard ground giving as good and generally better resultsthan in former years. Passing from… … Fig. 5.—Filter Gallery, Water Purification Works, at Columbus, Ohio. waters of winter with the result that the totalhardness drops to 150 parts per million. Anticipating these changes the designing en-gineers provided chemical mixing tanks induplicate, and the chemical storage tanks intriplicate.…
Buildings
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