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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Hydrologic droughts in Kansas— Are they becoming worse? Hydrologic droughts in Kansas— Are they becoming worse?
Multi-year droughts have been a recurrent feature of the climate and hydrology of Kansas since at least the 1930s. Streamflow records collected by the U.S. Geological Survey (USGS) indicate that water years 2000 to 2006 (October 1, 1999, through September 30, 2006) represent the sixth hydrologic drought during the past eight decades, and that corresponding streamflow levels in some parts...
Authors
James E. Putnam, Charles A. Perry, David M. Wolock
WaterWatch — Maps, graphs, and tables of current, recent, and past streamflow conditions WaterWatch — Maps, graphs, and tables of current, recent, and past streamflow conditions
WaterWatch (http://water.usgs.gov/waterwatch/) is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. The real-time information generally is updated on an hourly basis. WaterWatch provides streamgage-based maps that show the location of more than 3,000 long-term (30...
Authors
Xiaodong Jian, David Wolock, Harry F. Lins
Joint variability of global runoff and global sea surface temperatures Joint variability of global runoff and global sea surface temperatures
Global land surface runoff and sea surface temperatures (SST) are analyzed to identify the primary modes of variability of these hydroclimatic data for the period 1905-2002. A monthly water-balance model first is used with global monthly temperature and precipitation data to compute time series of annual gridded runoff for the analysis period. The annual runoff time series data are...
Authors
G.J. McCabe, D.M. Wolock
Streamflow of 2007--Water year summary Streamflow of 2007--Water year summary
The maps and graphs appearing in this summary describe streamflow conditions for water-year 2007 (October 1, 2006 to September 30, 2007) in the context of the 78-year period 1930-2007, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program. The period 1930-2007 was used because prior to 1930...
Authors
Jian Xiaodong, David M. Wolock, Harry F. Lins
Use of an integrated flow model to estimate ecologically relevant hydrologic characteristics at stream biomonitoring sites Use of an integrated flow model to estimate ecologically relevant hydrologic characteristics at stream biomonitoring sites
We developed an integrated hydroecological model to provide a comprehensive set of hydrologic variables representing five major components of the flow regime at 856 aquatic-invertebrate monitoring sites in New Jersey. The hydroecological model simulates streamflow by routing water that moves overland and through the subsurface from atmospheric delivery to the watershed outlet. Snow...
Authors
J.G. Kennen, L. J. Kauffman, M. A. Ayers, D.M. Wolock, Susan J. Colarullo
Factors influencing ground-water recharge in the eastern United States Factors influencing ground-water recharge in the eastern United States
Ground-water recharge estimates for selected locations in the eastern half of the United States were obtained by Darcian and chloride-tracer methods and compared using statistical analyses. Recharge estimates derived from unsaturated-zone (RUZC) and saturated-zone (RSZC) chloride mass balance methods are less variable (interquartile ranges or IQRs are 9.5 and 16.1 cm/yr, respectively)...
Authors
B. T. Nolan, R. W. Healy, P.E. Taber, K. Perkins, K.J. Hitt, D.M. Wolock
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Hydrologic droughts in Kansas— Are they becoming worse? Hydrologic droughts in Kansas— Are they becoming worse?
Multi-year droughts have been a recurrent feature of the climate and hydrology of Kansas since at least the 1930s. Streamflow records collected by the U.S. Geological Survey (USGS) indicate that water years 2000 to 2006 (October 1, 1999, through September 30, 2006) represent the sixth hydrologic drought during the past eight decades, and that corresponding streamflow levels in some parts...
Authors
James E. Putnam, Charles A. Perry, David M. Wolock
WaterWatch — Maps, graphs, and tables of current, recent, and past streamflow conditions WaterWatch — Maps, graphs, and tables of current, recent, and past streamflow conditions
WaterWatch (http://water.usgs.gov/waterwatch/) is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. The real-time information generally is updated on an hourly basis. WaterWatch provides streamgage-based maps that show the location of more than 3,000 long-term (30...
Authors
Xiaodong Jian, David Wolock, Harry F. Lins
Joint variability of global runoff and global sea surface temperatures Joint variability of global runoff and global sea surface temperatures
Global land surface runoff and sea surface temperatures (SST) are analyzed to identify the primary modes of variability of these hydroclimatic data for the period 1905-2002. A monthly water-balance model first is used with global monthly temperature and precipitation data to compute time series of annual gridded runoff for the analysis period. The annual runoff time series data are...
Authors
G.J. McCabe, D.M. Wolock
Streamflow of 2007--Water year summary Streamflow of 2007--Water year summary
The maps and graphs appearing in this summary describe streamflow conditions for water-year 2007 (October 1, 2006 to September 30, 2007) in the context of the 78-year period 1930-2007, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey's (USGS) National Streamflow Information Program. The period 1930-2007 was used because prior to 1930...
Authors
Jian Xiaodong, David M. Wolock, Harry F. Lins
Use of an integrated flow model to estimate ecologically relevant hydrologic characteristics at stream biomonitoring sites Use of an integrated flow model to estimate ecologically relevant hydrologic characteristics at stream biomonitoring sites
We developed an integrated hydroecological model to provide a comprehensive set of hydrologic variables representing five major components of the flow regime at 856 aquatic-invertebrate monitoring sites in New Jersey. The hydroecological model simulates streamflow by routing water that moves overland and through the subsurface from atmospheric delivery to the watershed outlet. Snow...
Authors
J.G. Kennen, L. J. Kauffman, M. A. Ayers, D.M. Wolock, Susan J. Colarullo
Factors influencing ground-water recharge in the eastern United States Factors influencing ground-water recharge in the eastern United States
Ground-water recharge estimates for selected locations in the eastern half of the United States were obtained by Darcian and chloride-tracer methods and compared using statistical analyses. Recharge estimates derived from unsaturated-zone (RUZC) and saturated-zone (RSZC) chloride mass balance methods are less variable (interquartile ranges or IQRs are 9.5 and 16.1 cm/yr, respectively)...
Authors
B. T. Nolan, R. W. Healy, P.E. Taber, K. Perkins, K.J. Hitt, D.M. Wolock