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Page 6053, results 151301 - 151325

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Publication Extents

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Reconnaissance of ground-water resources in the Western Coal Field Region, Kentucky
Bruce William Maxwell, Robert Washburn Devaul
1962, Water Supply Paper 1599
In the Western Coal Field region of Kentucky, water is obtained from consolidated sedimentary rocks of Mississippian and Pennsylvanian ages and from unconsolidated sediments of Cenozoic age. Pennsylvanian rocks crop out in more than 95 percent of the area and consist of shale and sandstone interbedded with some limestone and...
Water levels in observation wells in Santa Barbara County, California, in 1961
K. S. Muir
1962, Open-File Report 62-91
Investigation of the ground-water resources of Santa Barbara County was continued during 1961 by the U. S. Geological Survey in cooperation with the Santa Barbara County Water Agency. Monthly water-level measurements were made in 190 wells, in 9 of which automatic water-level recorders were operated. Earlier measurements, covering the period...
Current studies of the hydrology of prairie potholes
Jelmer B. Shjeflo
1962, Circular 472
The prairie potholes in the North-Central States and in Canada are of glacial origin. Because many of them contain ponds or marshes, they are important in the production of livestock and waterfowl. The objective of the present investigation is to determine the amount of water that accumulates in and is...
Notes on earth fissures in southern Arizona
G.M. Robinson, D.E. Peterson
1962, Circular 466
This report describes earth fissures at six sites in southern Arizona. These notes are preliminary to a more extensive study and detailed analysis being prepared by hydrologists in the Water Resources Division. Earth fissures were first recorded in Arizona in 1927, and have been noticed with increasing frequency since 1949....
The concept of entropy in landscape evolution
Luna Bergere Leopold, Walter Basil Langbein
1962, Professional Paper 500-A
The concept of entropy is expressed in terms of probability of various states. Entropy treats of the distribution of energy. The principle is introduced that the most probable condition exists when energy in a river system is as uniformly distributed as may be permitted by physical constraints. From these general...
Evolution of methods for evaluating the occurrence of floods
M. A. Benson
1962, Water Supply Paper 1580-A
A brief summary is given of the history of methods of expressing flood potentialities, proceeding from simple flood formulas to statistical methods of flood-frequency analysis on a regional basis. Current techniques are described and evaluated. Long-term flood records in the United States show no justification for the adoption of a...