David M Wolock, Ph.D.
David Wolock is a Supervisory Hydrologist with the USGS Water Resources Mission Area.
Science and Products
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Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models
Understanding the fate and transport of agricultural chemicals applied to agricultural fields will assist in designing the most effective strategies to prevent water-quality impairments. At a watershed scale, the processes controlling the fate and transport of agricultural chemicals are generally understood only conceptually. To examine the applicability of conceptual models to the...
Authors
Joshua I. Linard, David M. Wolock, Richard M. T. Webb, Michael Wieczorek
Regression models for explaining and predicting concentrations of organochlorine pesticides in fish from streams in the United States Regression models for explaining and predicting concentrations of organochlorine pesticides in fish from streams in the United States
Empirical regression models were developed for estimating concentrations of dieldrin, total chlordane, and total DDT in whole fish from U.S. streams. Models were based on pesticide concentrations measured in whole fish at 648 stream sites nationwide (1992-2001) as part of the U.S. Geological Survey's National Water Quality Assessment Program. Explanatory variables included fish lipid...
Authors
Lisa H. Nowell, Charles G. Crawford, Robert J. Gilliom, Naomi Nakagaki, Wesley W. Stone, Gail Thelin, David M. Wolock
Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds
Understanding nutrient pathways to streams will improve nutrient management strategies and estimates of the time lag between when changes in land use practices occur and when water quality effects that result from these changes are observed. Nitrate and orthophosphate (OP) concentrations in several environmental compartments were examined in watersheds having a range of base flow index...
Authors
A. J. Tesoriero, J.H. Duff, D.M. Wolock, N.E. Spahr, J.E. Almendinger
Predicting the natural flow regime: Models for assessing hydrological alteration in streams Predicting the natural flow regime: Models for assessing hydrological alteration in streams
Understanding the extent to which natural streamflow characteristics have been altered is an important consideration for ecological assessments of streams. Assessing hydrologic condition requires that we quantify the attributes of the flow regime that would be expected in the absence of anthropogenic modifications. The objective of this study was to evaluate whether selected streamflow
Authors
D.M. Carlisle, J. Falcone, D.M. Wolock, M. R. Meador, R.H. Norris
Streamflow of 2008--Water year summary Streamflow of 2008--Water year summary
The maps and graphs appearing in this summary describe streamflow conditions for water-year 2008 (October 1, 2007 to September 30, 2008) in the context of the 79-year period 1930-2008, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program. The period 1930-2008 was used because prior to 1930...
Authors
Jian Xiaodong, David M. Wolock, Harry F. Lins, Steve Brady
Recent declines in western U.S. snowpack in the context of twentieth-century climate variability Recent declines in western U.S. snowpack in the context of twentieth-century climate variability
A monthly snow accumulation and melt model was used with monthly Precipitation-elevation Regressions on Independent Slopes Model (PRISM) temperature and precipitation data to generate time series of 1 April snow water equivalent (SWE) for 1900 through 2008 in the western United States. Averaged across the western United States, SWE generally was higher than long-term (1900–2008) average...
Authors
Gregory J. McCabe, David M. Wolock
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models
Understanding the fate and transport of agricultural chemicals applied to agricultural fields will assist in designing the most effective strategies to prevent water-quality impairments. At a watershed scale, the processes controlling the fate and transport of agricultural chemicals are generally understood only conceptually. To examine the applicability of conceptual models to the...
Authors
Joshua I. Linard, David M. Wolock, Richard M. T. Webb, Michael Wieczorek
Regression models for explaining and predicting concentrations of organochlorine pesticides in fish from streams in the United States Regression models for explaining and predicting concentrations of organochlorine pesticides in fish from streams in the United States
Empirical regression models were developed for estimating concentrations of dieldrin, total chlordane, and total DDT in whole fish from U.S. streams. Models were based on pesticide concentrations measured in whole fish at 648 stream sites nationwide (1992-2001) as part of the U.S. Geological Survey's National Water Quality Assessment Program. Explanatory variables included fish lipid...
Authors
Lisa H. Nowell, Charles G. Crawford, Robert J. Gilliom, Naomi Nakagaki, Wesley W. Stone, Gail Thelin, David M. Wolock
Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds
Understanding nutrient pathways to streams will improve nutrient management strategies and estimates of the time lag between when changes in land use practices occur and when water quality effects that result from these changes are observed. Nitrate and orthophosphate (OP) concentrations in several environmental compartments were examined in watersheds having a range of base flow index...
Authors
A. J. Tesoriero, J.H. Duff, D.M. Wolock, N.E. Spahr, J.E. Almendinger
Predicting the natural flow regime: Models for assessing hydrological alteration in streams Predicting the natural flow regime: Models for assessing hydrological alteration in streams
Understanding the extent to which natural streamflow characteristics have been altered is an important consideration for ecological assessments of streams. Assessing hydrologic condition requires that we quantify the attributes of the flow regime that would be expected in the absence of anthropogenic modifications. The objective of this study was to evaluate whether selected streamflow
Authors
D.M. Carlisle, J. Falcone, D.M. Wolock, M. R. Meador, R.H. Norris
Streamflow of 2008--Water year summary Streamflow of 2008--Water year summary
The maps and graphs appearing in this summary describe streamflow conditions for water-year 2008 (October 1, 2007 to September 30, 2008) in the context of the 79-year period 1930-2008, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program. The period 1930-2008 was used because prior to 1930...
Authors
Jian Xiaodong, David M. Wolock, Harry F. Lins, Steve Brady
Recent declines in western U.S. snowpack in the context of twentieth-century climate variability Recent declines in western U.S. snowpack in the context of twentieth-century climate variability
A monthly snow accumulation and melt model was used with monthly Precipitation-elevation Regressions on Independent Slopes Model (PRISM) temperature and precipitation data to generate time series of 1 April snow water equivalent (SWE) for 1900 through 2008 in the western United States. Averaged across the western United States, SWE generally was higher than long-term (1900–2008) average...
Authors
Gregory J. McCabe, David M. Wolock