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Digital Provenance
Digitized materials: physical originals can be viewed in Special Collections and Archives reading room
Publisher
University of Nevada, Las Vegas. Libraries
Transcription
The overlying| confining beds of clay "that hold the water in the lower sands may reach a higher altitude along the foot of the * mountains than the confining beds of the higher sands, and thus, by maintaining a higher water level at the intake they may cause greater pressures in the lower sands in localities down the dip. Although no original water pressure determinations are available at this time, it seems likely that the artesian water pressures in the sands at different depths did not originally differ greatly but that the differences observed in 1938 are due largely to unequal drafts upon the water sands. Some of the wells in the Las Vegas are penetrate only the upper sands of the artesian system. Because of the lower cost of production from the upper sands, they have been drawn upon more heavily and for a longer time than the deeper sands, and consequently, the artesian water pressure has decreased more in the upper sands than it has in the lower sands. 11.
