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Page 470, results 11726 - 11750

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Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991
S. J. Kalkhoff, R.L. Kuzniar
1994, Open-File Report 94-56
Hydrologic data were collected in the Big Spring Basin located in Clayton County, Iowa, during the 1991 water year. The data were collected by the U.S. Geological Survey in cooperation with the Iowa Department of Natural Resources, Geological Survey Bureau, to provide information on variation and movement of agricultural chemicals...
Documentation of a computer program to simulate transient leakage from confining units using the modular finite-difference, ground-water flow model
S. A. Leake, P.P. Leahy, A. S. Navoy
1994, Open-File Report 94-59
Transient leakage into or out of a compressible fine-grained confining unit results from ground- water storage changes within the unit. The computer program described in this report provides a new method of simulating transient leakage using the U.S. Geological Survey modular finite- difference ground-water flow model (MODFLOW). The new...
Using analytical services at the National Water Quality Laboratory
L.K. Pratt
1994, Open-File Report 94-26
The National Water Quality Laboratory (NWQL) offers a variety of analytical services for the determination of constituents in samples of water, sediment, and biological material. As technology has advanced, many new methods have been introduced but not always incorporated into plans and schedules developed in the districts. The strengths and...
Methods for estimating magnitude and frequency of floods in the southwestern United States
B. E. Thomas, H. W. Hjalmarson, S. D. Waltemeyer
1994, Open-File Report 93-419
Methods have been developed for estimating magni- tude and frequency of floods at gaged and ungaged sites on streams in the southwestern United States. Estimating equations for ungaged sites that apply to small drainage basins were developed by transferring information from ungaged sites using techniques such as multiple regression...
A summary of pesticides in ground-water data collected by government agencies in Indiana, December 1985 to April 1991
M.R. Risch
1994, Open-File Report 93-133
The U.S. Geological Survey, in cooperation with the Indiana Department of Environmental Management, computerized the available government agency data on the occurrence of pesticides and pesticide metabolites in Indiana ground water. Results of analyses of 725 samples were summarized for the period December 1985 through April 1991. The data had...
Rainfall, evapotranspiration, total soil-water potential, and soil-water content at a sagebrush site and a replacement-vegetation site near Fort Defiance, Arizona, 1989-91
C. L. Thomas
1994, Open-File Report 94-43
The Navajo Nation Forestry Department established a growth of four species of native grasses and two species of native shrubs on formerly sagebrush- covered land about 6 miles north of Fort Defiance, Arizona. The native grasses and shrubs grew under conditions of natural precipitation and soil fertility. This provided alternate...
Bibliography of selected publications approved by the U.S. Geological Survey on the water resources of New Mexico, 1975-93
O.M. Sandoval
1994, Open-File Report 94-361
This bibliography of about 500 references authored by U.S. Geological Survey employees has been compiled to assist in the study and development of water resources. The citations are dated from January 1975 to December 1993. Each citation is numbered and indexed by geographic location and discipline. Selected citations are indexed...
1:250,000-scale Hydrologic Units of the United States
Peter Steeves, Douglas Nebert
1994, Open-File Report 1994-0236
The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a numberof data layers which were of interest to the USGS. One of these data layers was the Hydrologic Units. The map is based on the Hydrologic Unit Maps published by...