Timothy K Cowdery (Former Employee)
Science and Products
Filter Total Items: 20
Water resources of the Prairie Island Indian Reservation, Minnesota, 1994-97
This evaluation of the water resources on the Prairie Island Indian Reservation includes data collected from 8 surface-water sites and 22 wells during 1994–97 and historical data. The Mississippi River and the lakes and wetlands connected to it are separated from the Vermillion River and the lakes and wetlands connected to it by the surficial aquifer on Prairie Island and by Lock and Dam Number 3.
Authors
Timothy K. Cowdery
Estimation of nitrate contamination of an agro-ecosystem outwash aquifer using a nitrogen mass-balance budget
A mass-balance budget of N cycling was developed for an intensive agricultural area in west-central Minnesota to better understand NO3/- contamination of ground water in the Otter Tail outwash aquifer. Fertilizer, biological fixation, atmospheric deposition, and animal feed were the N sources, and crop harvests, animal product exports, volatilization from fertilizer and manure, and denitrification
Authors
L.J. Puckett, T.K. Cowdery, D. L. Lorenz, J.D. Stoner
Ground water resources of the Mille Lacs Lake area, east-central Minnesota
The Mille Lacs Lake study area is a 960 mi2 area containing the ground-water and surface-water drainages to both Mille Lacs Lake and the first 12 miles of the Rum River. Within this study area, available ground water occurs in saturated, overlapping, discontinuous, partially-connected, glacially-deposited (hereinafter, glacial) aquifers and in bedrock aquifers. No extensive glacial aquifer could b
Authors
L. C. Trotta, T.K. Cowdery
Ground-water quality in the Red River of the North Basin, Minnesota and North Dakota, 1991-95
Surveys of water quality in surficial, buried glacial, and Cretaceous aquifers in the Red River of the North Basin during 1991-95 showed that some major-ion, nutrient, pesticide, and radioactive-element concentrations differed by physiographic area and differed among these aquifer types. Waters in surficial aquifers in the Drift Prairie (west) and Lake Plain (central) physiographic areas were simi
Authors
T.K. Cowdery
Water quality in the Red River of the North Basin, Minnesota, North Dakota, and South Dakota, 1992-95
This report is intended to summarize major findings that emerged between 1992 and 1995 from the water-quality assessment of the River River of the North basin study unit and to relate these findings to water-quality issues of regional and national concern. The information in primarily intended for those who are involved in water-resource management. Yet the information contained here may also inte
Authors
Jeffrey D. Stoner, D. L. Lorenz, R. M. Goldstein, M. E. Brigham, T.K. Cowdery
Shallow ground-water quality beneath cropland in the Red River of the North Basin, Minnesota and North Dakota, 1993-95
During 1993-95, the agriculture on two sandy, surficial aquifers in the Red River of the North Basin affected the quality of shallow ground water in each aquifer differently. The Sheyenne Delta aquifer, in the western part of the basin, had land-use, hydrogeological, and rainfall characteristics that allowed few agricultural chemicals to reach or remain in the shallow ground water. The Otter Tail
Authors
Timothy K. Cowdery
Ground-water age dating and other tools used to assess land-use effects on water quality
A relatively new method for age dating recent ground water along with other investigative tools improve our understanding of land-use effects on the water quality in a surficial aquifer and adjacent streams in the Red River of the North Basin:
Ground water commonly takes more than 20 years to reach depths in the surficial aquifer where it is withdrawn for use.
Water withdrawn from most drinking-w
Authors
J.D. Stoner, T.K. Cowdery, L.J. Puckett
Similar agricultural areas, different ground-water quality, Red River of the North Basin, 1993-95
The U.S. Geological Survey has studied the ground-water quality within two areas of the Red River of the North Basin in southeastern North Dakota and west-central Minnesota. Although both areas are underlain by sandy surficial aquifers over which intensive irrigated agriculture dominates the land use, their ground-water quality differs. Ground water from the eastern study area has significantly hi
Authors
T.K. Cowdery
Science and Products
Filter Total Items: 20
Water resources of the Prairie Island Indian Reservation, Minnesota, 1994-97
This evaluation of the water resources on the Prairie Island Indian Reservation includes data collected from 8 surface-water sites and 22 wells during 1994–97 and historical data. The Mississippi River and the lakes and wetlands connected to it are separated from the Vermillion River and the lakes and wetlands connected to it by the surficial aquifer on Prairie Island and by Lock and Dam Number 3.
Authors
Timothy K. Cowdery
Estimation of nitrate contamination of an agro-ecosystem outwash aquifer using a nitrogen mass-balance budget
A mass-balance budget of N cycling was developed for an intensive agricultural area in west-central Minnesota to better understand NO3/- contamination of ground water in the Otter Tail outwash aquifer. Fertilizer, biological fixation, atmospheric deposition, and animal feed were the N sources, and crop harvests, animal product exports, volatilization from fertilizer and manure, and denitrification
Authors
L.J. Puckett, T.K. Cowdery, D. L. Lorenz, J.D. Stoner
Ground water resources of the Mille Lacs Lake area, east-central Minnesota
The Mille Lacs Lake study area is a 960 mi2 area containing the ground-water and surface-water drainages to both Mille Lacs Lake and the first 12 miles of the Rum River. Within this study area, available ground water occurs in saturated, overlapping, discontinuous, partially-connected, glacially-deposited (hereinafter, glacial) aquifers and in bedrock aquifers. No extensive glacial aquifer could b
Authors
L. C. Trotta, T.K. Cowdery
Ground-water quality in the Red River of the North Basin, Minnesota and North Dakota, 1991-95
Surveys of water quality in surficial, buried glacial, and Cretaceous aquifers in the Red River of the North Basin during 1991-95 showed that some major-ion, nutrient, pesticide, and radioactive-element concentrations differed by physiographic area and differed among these aquifer types. Waters in surficial aquifers in the Drift Prairie (west) and Lake Plain (central) physiographic areas were simi
Authors
T.K. Cowdery
Water quality in the Red River of the North Basin, Minnesota, North Dakota, and South Dakota, 1992-95
This report is intended to summarize major findings that emerged between 1992 and 1995 from the water-quality assessment of the River River of the North basin study unit and to relate these findings to water-quality issues of regional and national concern. The information in primarily intended for those who are involved in water-resource management. Yet the information contained here may also inte
Authors
Jeffrey D. Stoner, D. L. Lorenz, R. M. Goldstein, M. E. Brigham, T.K. Cowdery
Shallow ground-water quality beneath cropland in the Red River of the North Basin, Minnesota and North Dakota, 1993-95
During 1993-95, the agriculture on two sandy, surficial aquifers in the Red River of the North Basin affected the quality of shallow ground water in each aquifer differently. The Sheyenne Delta aquifer, in the western part of the basin, had land-use, hydrogeological, and rainfall characteristics that allowed few agricultural chemicals to reach or remain in the shallow ground water. The Otter Tail
Authors
Timothy K. Cowdery
Ground-water age dating and other tools used to assess land-use effects on water quality
A relatively new method for age dating recent ground water along with other investigative tools improve our understanding of land-use effects on the water quality in a surficial aquifer and adjacent streams in the Red River of the North Basin:
Ground water commonly takes more than 20 years to reach depths in the surficial aquifer where it is withdrawn for use.
Water withdrawn from most drinking-w
Authors
J.D. Stoner, T.K. Cowdery, L.J. Puckett
Similar agricultural areas, different ground-water quality, Red River of the North Basin, 1993-95
The U.S. Geological Survey has studied the ground-water quality within two areas of the Red River of the North Basin in southeastern North Dakota and west-central Minnesota. Although both areas are underlain by sandy surficial aquifers over which intensive irrigated agriculture dominates the land use, their ground-water quality differs. Ground water from the eastern study area has significantly hi
Authors
T.K. Cowdery
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government