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Chemical quality of ground water in Fairfax County, Virginia
J. D. Larson
1978, Open-File Report 78-268
Two maps portray the chemical quality of ground water in Fairfax County, Virginia. One map shows dissolved-solids concentration and chemical analyses diagrams. The other indicates hardness and areas of marginal water quality. Three tables of chemical analysis representing the three distinct rock types in the county are presented also. (Woodard-USGS)...
Characteristics of the Landsat Multispectral Data System
James V. Taranik
1978, Open-File Report 78-187
Landsat satellites were launched into orbit in 1972 and 1975. Additional Landsat satellites are planned for launch in 1978 and 1981. The satellites orbit the Earth at an altitude of approximately 900 km and each can obtain repetitive coverage of cloud-free areas every 18 days. A sun-synchronous orbit is used...
Rock pushing and sampling under rocks on Mars
H. J. Moore, S. Liebes Jr., D.S. Crouch, L.V. Clark
1978, Professional Paper 1081
Viking Lander 2 acquired samples on Mars from beneath two rocks, where living organisms and organic molecules would be protected from ultraviolet radiation. Selection of rocks to be moved was based on scientific and engineering considerations, including rock size, rock shape, burial depth, and location in a sample field. Rock...
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...