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Page 4638, results 115926 - 115950

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Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania; methods of data collection and analysis and description of study areas
Douglas C. Chichester
1988, Open-File Report 88-96
The U.S. Geological Survey is conducting a water quality study as part of the nationally implemented Rural Clean Water Program in the headwaters of the Conestoga River, Pennsylvania. The study, which began in 1982, was designed to determine the effect of agricultural best management practices on surface--and groundwater quality. The...
Hydrologic data for computation of sediment discharge: Toutle and North Fork Toutle Rivers near Mount St. Helens, Washington, water years 1980-84
Dallas Childers, Stephen E. Hammond, William P. Johnson
1988, Open-File Report 87-548
Immediately after the devastating May 18, 1980, eruption of Mount St. Helens, a program was initiated by the U.S. Geological Survey to study the streamflow and sediment characteristics of streams impacted by the eruption. Some of the data gathered in that program are presented in this report. Data are presented...
A guide to commonly used map projections prepared for use in HyperCard, 1988
Tau Rho Alpha, Joe F. Vigil, Lauren Buchholz
1988, Open-File Report 88-364
This guide briefly describes and illustrates the characteristics of 17 map projections commonly used to present thematic data. By means of simple sketches of the basic grid system of longitude and latitude known as the Earth's graticule, the guide shows examples of the following categories of map projections: planes (azimuthal),...
Summaries of water-quality data collected during 1979-87 for selected James River and refuge locations in North Dakota and South Dakota
L. I. Briel
1988, Open-File Report 88-732
Water-quality data were collected during 1979-87 at selected locations In the central part of the James River basin, North and South Dakota, by the U.S. Geological Survey and the U.S. Bureau of Reclamation to document baseline conditions In three wildlife refuges. These data are needed to determine potential impacts on...