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Risk analyses for a water-supply system; Occoquan Reservoir, Fairfax and Prince William counties, Virginia
Robert M. Hirsch
1978, Open-File Report 78-452
This report demonstrates two techniques for evaluating risks in the operation of a water-supply system. Both rely on reconstructed historical streamflow data to develop estimates of the probabilities of certain specific events occurring in the future. These techniques are applied to the Occoquan Reservoir which was experiencing an unprecedented low...
Analyses of rocks and stream sediments of the Superstition Wilderness, Arizona
J. M. Motooka, R. F. Sanzolone, Craig A. Curtis
1978, Open-File Report 78-483
The geochemical investigation of the Superstition Wilderness, Maricopa, Pinal and Gila Counties, Arizona, consisted of the collection and analyses of 2269 samples. This included 1231 rocks and 1038 stream sediments. All samples were prepared and analyzed on location during two separate field seasons (fall of 1975 and 1976) by mobile...
Principles of computer processing of Landsat data for geologic applications
James V. Taranik
1978, Open-File Report 78-117
The main objectives of computer processing of Landsat data for geologic applications are to improve display of image data to the analyst or to facilitate evaluation of the multispectral characteristics of the data. Interpretations of the data are made from enhanced and classified data by an analyst trained in geology....