David M Wolock, Ph.D.
David Wolock is a Supervisory Hydrologist with the USGS Water Resources Mission Area.
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data
A geographic information system (GIS) was used to estimate agricultural pesticide use in the drainage basins of streams that are studied as part of the U.S. Geological Survey?s National Water-Quality Assessment (NAWQA) Program. Drainage basin pesticide use estimates were computed by intersecting digital maps of drainage basin boundaries with an enhanced version of the National Land Cover...
Authors
Naomi Nakagaki, David M. Wolock
Estimates of median flows for streams on the 1999 Kansas Surface Water Register Estimates of median flows for streams on the 1999 Kansas Surface Water Register
The Kansas State Legislature, by enacting Kansas Statute KSA 82a?2001 et. seq., mandated the criteria for determining which Kansas stream segments would be subject to classification by the State. One criterion for the selection as a classified stream segment is based on the statistic of median flow being equal to or greater than 1 cubic foot per second. As specified by KSA 82a?2001 et...
Authors
Charles A. Perry, David M. Wolock, Joshua C. Artman
Estimates of flow duration, mean flow, and peak-discharge frequency values for Kansas stream locations Estimates of flow duration, mean flow, and peak-discharge frequency values for Kansas stream locations
Streamflow statistics of flow duration and peak-discharge frequency were estimated for 4,771 individual locations on streams listed on the 1999 Kansas Surface Water Register. These statistics included the flow-duration values of 90, 75, 50, 25, and 10 percent, as well as the mean flow value. Peak-discharge frequency values were estimated for the 2-, 5-, 10-, 25-, 50-, and 100-year floods...
Authors
Charles A. Perry, David M. Wolock, Joshua C. Artman
Delineation and evaluation of hydrologic-landscape regions in the United States using geographic information system tools and multivariate statistical analyses. Delineation and evaluation of hydrologic-landscape regions in the United States using geographic information system tools and multivariate statistical analyses.
Hydrologic-landscape regions in the United States were delineated by using geographic information system (GIS) tools combined with principal components and cluster analyses. The GIS and statistical analyses were applied to land-surface form, geologic texture (permeability of the soil and bedrock), and climate variables that describe the physical and climatic setting of 43,931 small...
Authors
David M. Wolock, Thomas C. Winter, Gerard McMahon
Base-Flow Index Grid for the Conterminous United States Base-Flow Index Grid for the Conterminous United States
This 1-kilometer raster (grid) dataset for the conterminous United States was created by interpolating base-flow index (BFI) values estimated at U.S. Geological Survey (USGS) streamgages. Base flow is the component of streamflow that can be attributed to ground-water discharge into streams.
Authors
David M. Wolock
Estimated mean annual natural ground-water recharge in the conterminous United States Estimated mean annual natural ground-water recharge in the conterminous United States
This 1-kilometer resolution raster (grid) dataset is an index of mean annual natural ground-water recharge. The dataset was created by multiplying a grid of base-flow index (BFI) values by a grid of mean annual runoff values derived from a 1951-80 mean annual runoff contour map. Mean annual runoff is long-term average streamflow expressed on a per-unit-area basis.
Authors
David M. Wolock
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 134
Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data Estimation of agricultural pesticide use in drainage basins using land cover maps and county pesticide data
A geographic information system (GIS) was used to estimate agricultural pesticide use in the drainage basins of streams that are studied as part of the U.S. Geological Survey?s National Water-Quality Assessment (NAWQA) Program. Drainage basin pesticide use estimates were computed by intersecting digital maps of drainage basin boundaries with an enhanced version of the National Land Cover...
Authors
Naomi Nakagaki, David M. Wolock
Estimates of median flows for streams on the 1999 Kansas Surface Water Register Estimates of median flows for streams on the 1999 Kansas Surface Water Register
The Kansas State Legislature, by enacting Kansas Statute KSA 82a?2001 et. seq., mandated the criteria for determining which Kansas stream segments would be subject to classification by the State. One criterion for the selection as a classified stream segment is based on the statistic of median flow being equal to or greater than 1 cubic foot per second. As specified by KSA 82a?2001 et...
Authors
Charles A. Perry, David M. Wolock, Joshua C. Artman
Estimates of flow duration, mean flow, and peak-discharge frequency values for Kansas stream locations Estimates of flow duration, mean flow, and peak-discharge frequency values for Kansas stream locations
Streamflow statistics of flow duration and peak-discharge frequency were estimated for 4,771 individual locations on streams listed on the 1999 Kansas Surface Water Register. These statistics included the flow-duration values of 90, 75, 50, 25, and 10 percent, as well as the mean flow value. Peak-discharge frequency values were estimated for the 2-, 5-, 10-, 25-, 50-, and 100-year floods...
Authors
Charles A. Perry, David M. Wolock, Joshua C. Artman
Delineation and evaluation of hydrologic-landscape regions in the United States using geographic information system tools and multivariate statistical analyses. Delineation and evaluation of hydrologic-landscape regions in the United States using geographic information system tools and multivariate statistical analyses.
Hydrologic-landscape regions in the United States were delineated by using geographic information system (GIS) tools combined with principal components and cluster analyses. The GIS and statistical analyses were applied to land-surface form, geologic texture (permeability of the soil and bedrock), and climate variables that describe the physical and climatic setting of 43,931 small...
Authors
David M. Wolock, Thomas C. Winter, Gerard McMahon
Base-Flow Index Grid for the Conterminous United States Base-Flow Index Grid for the Conterminous United States
This 1-kilometer raster (grid) dataset for the conterminous United States was created by interpolating base-flow index (BFI) values estimated at U.S. Geological Survey (USGS) streamgages. Base flow is the component of streamflow that can be attributed to ground-water discharge into streams.
Authors
David M. Wolock
Estimated mean annual natural ground-water recharge in the conterminous United States Estimated mean annual natural ground-water recharge in the conterminous United States
This 1-kilometer resolution raster (grid) dataset is an index of mean annual natural ground-water recharge. The dataset was created by multiplying a grid of base-flow index (BFI) values by a grid of mean annual runoff values derived from a 1951-80 mean annual runoff contour map. Mean annual runoff is long-term average streamflow expressed on a per-unit-area basis.
Authors
David M. Wolock