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Page 865, results 21601 - 21625

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Digital data base application to porphyry copper mineralization in Alaska; case study summary
Charles M. Trautwein, David D. Greenlee, Donald G. Orr
1982, Open-File Report 82-801
The purpose of this report is to summarize the progress in use of digital image analysis techniques in developing a conceptual model for assessing porphyry copper mineral potential. The study area consists of approximately the southern one-half of the 1? by 3? Nabesna quadrangle in east-central Alaska. The digital geologic...
Simulated changes in water levels in the Minjur Aquifer, Riyadh area, Saudi Arabia
J. F. Williams, I.A. Sagaby
1982, Open-File Report 82-371
A two-dimensional finite-difference computer model of the Minjur aquifer in the Riyadh area of Saudi Arabia was developed to simulate and predict drawdown in an aquifer which, in 1979, supplied more than 80 percent of all water used in this capital area. The Minjur was modeled as a confined aquifer...
Potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1982
George R. Schiner, Eugene C. Hayes
1982, Open-File Report 83-30
This map presents the potentiometric surface of the Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1982. The Floridan aquifer is the principal source of potable water in the area. Water-level measurements were made on approximately 1,000 wells and on several springs. The potentiometric...
Hydrologic data for urban studies in the Austin, Texas, metropolitan area, 1980
R.M. Slade, J.L. Gaylord, M.E. Dorsey, R.N. Mitchell, J.D. Gordon
1982, Open-File Report 82-506
Hydrologic investigations of urban watersheds in Texas were begun by the U.S. Geological Survey in 1954. Studies are now in progress in Austin, Houston, and San Antonio. Studies have been completed in the Dallas and Fort Worth areas. The Geological Survey, in cooperation with the Texas Department of Water Resources, began...