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Page 4525, results 113101 - 113125

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Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey
T. C. Willoughby, R.B. See, L.J. Schroder
1989, Water-Resources Investigations Report 89-4042
Three experiments were conducted to determine the stability of nitrate-ion concentrations in simulated deposition samples. In the four experiment-A solutions, nitric acid provided nitrate-ion concentrations ranging from 0.6 to 10.0 mg/L and that had pH values ranging from 3.8 to 5.0. In the five experiment-B solutions, sodium nitrate provided nitrate-ion...
Cost-effectiveness of the streamflow-gaging program in Minnesota
T. A. Winterstein, A.D. Arntson
1989, Water-Resources Investigations Report 88-4129
A three-step analysis of the cost-effectiveness of the streamflow-gaging program in Minnesota is documented in this report. In the first step of the analysis, the data uses and funding sources were identified for the 96 continuous-record streamflow-gaging stations operated in 1985. Nineteen sources of funding and 42 uses were identified for...
Effects of river discharge and high-tide stage on salinity intrusion in the Weeki Wachee, Crystal, and Withlacoochee River estuaries, southwest Florida
D. K. Yobbi, L. A. Knochenmus
1989, Water-Resources Investigations Report 88-4116
The Weeki Wachee, Crystal, and Withlacoochee Rivers are coastal streams flowing into the Gulf of Mexico that may be affected by either future surface water or groundwater withdrawals. Reduction of river discharge will affect the upstream extent of saltwater intrusion in the rivers; however, under certain reduced low-flow discharges, the...
Suspended-sediment data in the upper Rio Grande De Loiza basin, Puerto Rico
Senen Guzman-Rios
1989, Open-File Report 88-324
Fluvial sediment, a widely recognized pollutant of surface water , is reducing the efficiency and useful life of almost all reservoirs in Puerto Rico. Sediment transported from the upper basin of the Rio Grande de Loiza is eventually deposited in the bottom of Lago Loiza, a water reservoir. Suspended sediment...
Geologic map of the Latir Volcanic Field and adjacent areas, northern New Mexico
P. W. Lipman, J. C. Reed Jr.
1989, IMAP 1907
This map was first published as a printed edition in 1989. The geologic data have now been captured digitally and are presented here along with images of the printed map sheet and component parts as PDF files. This map encompasses all or parts of ten 7.5 minute quadrangles in the Taos...
Preparation of average annual runoff map of the United States, 1951-80
W.R. Krug, W.A. Gebert, D.J. Graczyk
1989, Open-File Report 87-535
Average annual runoff was computed or estimated for 2,148 hydrologic cataloging units in the United States and Puerto Rico , for the period 1951-80. Runoff was computed from the recorded streamflow at 5,951 U.S. Geological Survey gaging stations. The runoff at more than 3,000 of these stations was estimated by...