Identifier: geologywaterreso02mein (find matches)
Title: Geology and water resources of Sulphur Spring Valley, Arizona
Year: 1913 (1910s)
Authors: Meinzer, Oscar Edward, 1876-1948 Kelton, F. C Forbes, Robert Humphrey, b. 1867 University of Arizona. Agricultural Experiment Station
Subjects: Geology Water-supply
Publisher: Washington : Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
approximately similar to that cf the chlorides, ascan be seen by comparing figures 29 and 30. In the north basin thesulphates increase in general from the borders toward an area thatincludes the alkali flat and the region east of Willcox, the area overwhich they occur in considerable quantities being small. (See fig.30.) The water below the flat south of Soldiers Hole and nearWhitewater Draw for some distance south of this flat contains onlymoderate amounts of sulphates, although in general it containssomewhat more than the waters beneath the adjacent slopes. Sam-ples from several wells near the axis of the valley in the vicinityof Douglas contained much larger amounts. In the area of highlymineralized water east of Douglas the sulphates are unusuallyabundant, although the amount of chlorine in this water is not great.In the water from Frank Doans well, for instance, the sulphatecontent is 1,315 parts per million, but the chlorine content is only21 parts. QUALITY OF GROUND WATERS. 139
Text Appearing After Image:
Figure 30.—: Map of Sulphur Spring Valley, showing the approximate amounts, in parts per million,of the sulphate radicle in the ground waters. 140 WATER RESOURCES OF SULPHUR SPRING VALLEY, ARIZONA.CARBONATES AND BICARBONATES. Carbonates and bicarbonates are readily converted into oneanother and should therefore be considered together. In the pres-ence of an abundant supply of carbon dioxide the carbonate radiclechanges into the more or less indefinite bicarbonate radicle. Thischange occurs when calcium carbonate (limestone), itself nearlyinsoluble, is taken into solution. If, on the other hand, carbondioxide is removed from the water, as occurs when the water isheated or when lime is added, a reverse process takes place, thebicarbonate being converted into carbonate, as a result of whichcalcium carbonate is precipitated. The smallest amount of the bicarbonate radicle found was 55parts per million; the largest was 1,141 parts, or about 20 times asmuch. Less difference therefore exist

Note About Images