Abstract
Boulder City, Nevada, the construction city of the Hoover Dam project and the center of so many remarkable engineering achievements, has the further distinction of being the first community to soften Colorado River water for domestic consumption. Realizing the expediency of furnishing the prospective inhabitants of this desert community with a water of highest quality, the United States Bureau of Reclamation included an unusually modern water treatment plant in their plans. A study of the characteristics of the Colorado River, which surveys showed to be the most logical raw water source, revealed the fact it is not only extremely turbid, but very hard. Analyses made by the United States Geological Survey at Grand Canyon, for the years 1926-1928 indicated a suspended solids content ranging from 350 to 59,400, with an approximate average of 6000 p.p.m. The average mineral content of the water for this period was as follows:
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