Hank Johnson
I am a research hydrologist at the USGS Oregon Water Science Center. I have been working on groundwater and water-quality issues regionally and nationally for more than 20 years. My research interests include arid-system hydrology, groundwater and spring systems, and environmental tracers.
Education and Certifications
B.S., Geological Sciences, Virginia Polytechnic Institute & State University, Blacksburg, Virginia, 1992
M.S., Environmental Science and Engineering, Oregon Graduate Institute of Science & Technology, Hillsboro, Oregon, 1996
Science and Products
Filter Total Items: 39
Surface-water nutrient conditions and sources in the United States Pacific Northwest Surface-water nutrient conditions and sources in the United States Pacific Northwest
The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well as landscape characteristics that...
Authors
D.R. Wise, H.M. Johnson
Subsurface transport of orthophosphate in five agricultural watersheds, USA Subsurface transport of orthophosphate in five agricultural watersheds, USA
Concentrations of dissolved orthophosphate (ortho P) in the unsaturated zone, groundwater, tile drains, and groundwater/stream water interfaces were assessed in five agricultural watersheds to determine the potential for subsurface transport. Concentrations of iron oxides were measured in the aquifer material and adsorption of ortho P on oxide surfaces was assessed by geochemical...
Authors
Joseph L. Domagalski, Henry M. Johnson
Trends in pesticide concentrations in streams of the western United States, 1993-2005 Trends in pesticide concentrations in streams of the western United States, 1993-2005
Trends in pesticide concentrations for 15 streams in California, Oregon, Washington, and Idaho were determined for the organophosphate insecticides chlorpyrifos and diazinon and the herbicides atrazine, s‐ethyl diproplythiocarbamate (EPTC), metolachlor, simazine, and trifluralin. A parametric regression model was used to account for flow, seasonality, and antecedent hydrologic conditions...
Authors
Henry M. Johnson, Joseph L. Domagalski, Dina Saleh
Effect of agricultural practices on hydrology and water chemistry in a small irrigated catchment, Yakima River Basin, Washington Effect of agricultural practices on hydrology and water chemistry in a small irrigated catchment, Yakima River Basin, Washington
The role of irrigation and artificial drainage in the hydrologic cycle and the transport of solutes in a small agricultural catchment in central Washington's Yakima Valley were explored using hydrologic, chemical, isotopic, age-dating, and mineralogical data from several environmental compartments, including stream water, ground water, overland flow, and streambed pore water. A...
Authors
K. A. McCarthy, Henry M. Johnson
Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States
The ability of natural attenuation to mitigate agricultural nitrate contamination in recharging aquifers was investigated in four important agricultural settings in the United States. The study used laboratory analyses, field measurements, and flow and transport modeling for monitoring well transects (0.5 to 2.5 km in length) in the San Joaquin watershed, California, the Elkhorn...
Authors
C.T. Green, L.J. Puckett, J.K. Böhlke, B.A. Bekins, S.P. Phillips, L. J. Kauffman, J. M. Denver, H.M. Johnson
Effects of urbanization on stream ecosystems in the Willamette River basin and surrounding area, Oregon and Washington Effects of urbanization on stream ecosystems in the Willamette River basin and surrounding area, Oregon and Washington
This report describes the effects of urbanization on physical, chemical, and biological characteristics of stream ecosystems in 28 watersheds along a gradient of urbanization in the Willamette River basin and surrounding area, Oregon and Washington, from 2003 through 2005. The study that generated the report is one of several urban-effects studies completed nationally by the U.S...
Authors
Ian R. Waite, Steven Sobieszczyk, Kurt D. Carpenter, Andrew J. Arnsberg, Henry M. Johnson, Curt A. Hughes, Michael J. Sarantou, Frank A. Rinella
Science and Products
Filter Total Items: 39
Surface-water nutrient conditions and sources in the United States Pacific Northwest Surface-water nutrient conditions and sources in the United States Pacific Northwest
The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well as landscape characteristics that...
Authors
D.R. Wise, H.M. Johnson
Subsurface transport of orthophosphate in five agricultural watersheds, USA Subsurface transport of orthophosphate in five agricultural watersheds, USA
Concentrations of dissolved orthophosphate (ortho P) in the unsaturated zone, groundwater, tile drains, and groundwater/stream water interfaces were assessed in five agricultural watersheds to determine the potential for subsurface transport. Concentrations of iron oxides were measured in the aquifer material and adsorption of ortho P on oxide surfaces was assessed by geochemical...
Authors
Joseph L. Domagalski, Henry M. Johnson
Trends in pesticide concentrations in streams of the western United States, 1993-2005 Trends in pesticide concentrations in streams of the western United States, 1993-2005
Trends in pesticide concentrations for 15 streams in California, Oregon, Washington, and Idaho were determined for the organophosphate insecticides chlorpyrifos and diazinon and the herbicides atrazine, s‐ethyl diproplythiocarbamate (EPTC), metolachlor, simazine, and trifluralin. A parametric regression model was used to account for flow, seasonality, and antecedent hydrologic conditions...
Authors
Henry M. Johnson, Joseph L. Domagalski, Dina Saleh
Effect of agricultural practices on hydrology and water chemistry in a small irrigated catchment, Yakima River Basin, Washington Effect of agricultural practices on hydrology and water chemistry in a small irrigated catchment, Yakima River Basin, Washington
The role of irrigation and artificial drainage in the hydrologic cycle and the transport of solutes in a small agricultural catchment in central Washington's Yakima Valley were explored using hydrologic, chemical, isotopic, age-dating, and mineralogical data from several environmental compartments, including stream water, ground water, overland flow, and streambed pore water. A...
Authors
K. A. McCarthy, Henry M. Johnson
Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States
The ability of natural attenuation to mitigate agricultural nitrate contamination in recharging aquifers was investigated in four important agricultural settings in the United States. The study used laboratory analyses, field measurements, and flow and transport modeling for monitoring well transects (0.5 to 2.5 km in length) in the San Joaquin watershed, California, the Elkhorn...
Authors
C.T. Green, L.J. Puckett, J.K. Böhlke, B.A. Bekins, S.P. Phillips, L. J. Kauffman, J. M. Denver, H.M. Johnson
Effects of urbanization on stream ecosystems in the Willamette River basin and surrounding area, Oregon and Washington Effects of urbanization on stream ecosystems in the Willamette River basin and surrounding area, Oregon and Washington
This report describes the effects of urbanization on physical, chemical, and biological characteristics of stream ecosystems in 28 watersheds along a gradient of urbanization in the Willamette River basin and surrounding area, Oregon and Washington, from 2003 through 2005. The study that generated the report is one of several urban-effects studies completed nationally by the U.S...
Authors
Ian R. Waite, Steven Sobieszczyk, Kurt D. Carpenter, Andrew J. Arnsberg, Henry M. Johnson, Curt A. Hughes, Michael J. Sarantou, Frank A. Rinella