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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Streamflow of 2011 - Water Year Summary Streamflow of 2011 - Water Year Summary
The maps and graph in this summary describe streamflow conditions for water year 2011 (October 1, 2010, to September 30, 2011) in the context of the 82-year period from 1930 through 2011, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program (http://water.usgs.gov/nsip/). The period 1930-2010...
Authors
Xiaodong Jian, David M. Wolock, Harry F. Lins, Steve Brady
Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States
Tobit regression models were developed to predict the summed concentration of atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine] and its degradate deethylatrazine [6-chloro-N-(1-methylethyl)-1,3,5,-triazine-2,4-diamine] (DEA) in shallow groundwater underlying agricultural settings across the conterminous United States. The models were developed from atrazine and...
Authors
Paul E. Stackelberg, Jack E. Barbash, Robert J. Gilliom, Wesley W. Stone, David M. Wolock
Sparrow modeling to understand water quality conditions in major regions of the United States: A featured collection introduction Sparrow modeling to understand water quality conditions in major regions of the United States: A featured collection introduction
No abstract available.
Authors
Stephen D. Preston, Richard B. Alexander, David M. Wolock
Digital hydrologic networks supporting applications related to spatially referenced regression modeling Digital hydrologic networks supporting applications related to spatially referenced regression modeling
Digital hydrologic networks depicting surface-water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the movement of water and associated...
Authors
John W. Brakebill, David M. Wolock, Silvia Terziotti
Digital hydrologic networks supporting applications related to spatially referenced regression modeling Digital hydrologic networks supporting applications related to spatially referenced regression modeling
Digital hydrologic networks depicting surface‐water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the movement of water and associated...
Authors
J. W. Brakebill, D.M. Wolock, S.E. Terziotti
Alteration of streamflow magnitudes and potential ecological consequences: A multiregional assessment Alteration of streamflow magnitudes and potential ecological consequences: A multiregional assessment
Human impacts on watershed hydrology are widespread in the US, but the prevalence and severity of stream‐flow alteration and its potential ecological consequences have not been quantified on a national scale. We assessed streamflow alteration at 2888 streamflow monitoring sites throughout the conterminous US. The magnitudes of mean annual (1980–2007) minimum and maximum streamflows were...
Authors
Daren M. Carlisle, David M. Wolock, Michael R. Meador
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Streamflow of 2011 - Water Year Summary Streamflow of 2011 - Water Year Summary
The maps and graph in this summary describe streamflow conditions for water year 2011 (October 1, 2010, to September 30, 2011) in the context of the 82-year period from 1930 through 2011, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program (http://water.usgs.gov/nsip/). The period 1930-2010...
Authors
Xiaodong Jian, David M. Wolock, Harry F. Lins, Steve Brady
Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States
Tobit regression models were developed to predict the summed concentration of atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine] and its degradate deethylatrazine [6-chloro-N-(1-methylethyl)-1,3,5,-triazine-2,4-diamine] (DEA) in shallow groundwater underlying agricultural settings across the conterminous United States. The models were developed from atrazine and...
Authors
Paul E. Stackelberg, Jack E. Barbash, Robert J. Gilliom, Wesley W. Stone, David M. Wolock
Sparrow modeling to understand water quality conditions in major regions of the United States: A featured collection introduction Sparrow modeling to understand water quality conditions in major regions of the United States: A featured collection introduction
No abstract available.
Authors
Stephen D. Preston, Richard B. Alexander, David M. Wolock
Digital hydrologic networks supporting applications related to spatially referenced regression modeling Digital hydrologic networks supporting applications related to spatially referenced regression modeling
Digital hydrologic networks depicting surface-water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the movement of water and associated...
Authors
John W. Brakebill, David M. Wolock, Silvia Terziotti
Digital hydrologic networks supporting applications related to spatially referenced regression modeling Digital hydrologic networks supporting applications related to spatially referenced regression modeling
Digital hydrologic networks depicting surface‐water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the movement of water and associated...
Authors
J. W. Brakebill, D.M. Wolock, S.E. Terziotti
Alteration of streamflow magnitudes and potential ecological consequences: A multiregional assessment Alteration of streamflow magnitudes and potential ecological consequences: A multiregional assessment
Human impacts on watershed hydrology are widespread in the US, but the prevalence and severity of stream‐flow alteration and its potential ecological consequences have not been quantified on a national scale. We assessed streamflow alteration at 2888 streamflow monitoring sites throughout the conterminous US. The magnitudes of mean annual (1980–2007) minimum and maximum streamflows were...
Authors
Daren M. Carlisle, David M. Wolock, Michael R. Meador