Dataset Identification:
Resource Abstract:
- description: This data set represents predicted nitrate concentration in ground water used for drinking, in milligrams per
liter, in the conterminous United States, and was generated by a national nonlinear regression model based on 14 input parameters.
Nolan and Hitt (2006) developed two national models to predict contamination of ground water by nonpoint sources of nitrate.
The nonlinear approach to national-scale Ground-WAter Vulnerability Assessment (GWAVA) uses components representing nitrogen
(N) sources, transport, and attenuation. One model (GWAVA-S) predicts nitrate contamination of shallow (typically less than
5 meters deep), recently recharged ground water, which may or may not be used for drinking. The other (GWAVA-DW) predicts
ambient nitrate concentration in deeper supplies used for drinking. This data set is a national map of nitrate concentration
(in milligrams per liter) in U.S ground water used for drinking as predicted by the GWAVA-DW model. The data set is one of
14 spatial data sets (1 output data set and 13 input data sets) associated with the GWAVA-DW model. Full details of the model
development are in Nolan and Hitt (2006). This data set represents the model output, which is depicted in figure 3 of Nolan
and Hitt (2006) that shows predicted nitrate concentration in milligrams per liter in ground water used for drinking. The
model results can be used to indicate areas of the Nation that may be vulnerable to nitrate contamination. For inputs to the
model, spatial attributes representing 13 nitrogen loading and transport and attenuation factors were compiled as raster data
sets (1-km by 1-km grid cell size) for the conterminous United States (see table 1). >Table 1.-- Parameters of nonlinear
regression model for > nitrate in ground water used for drinking (GWAVA-DW) > and corresponding input spatial data sets.
> [kg, kilograms; km2, square kilometers.] > >Nitrogen Source Factors Data Set Name > 1 farm fertilizer (kg/hectare)
gwava-dw_ffer > 2 confined manure (kg/hectare) gwava-dw_conf > 3 orchards/vineyards (percent) gwava-dw_orvi > 4 population
density (people/km2) gwava-dw_popd > >Transport to Aquifer Factors > 5 water input (km2/cm) gwava-dw_wtin > 6
glacial till (yes/no) gwava-dw_gtil > 7 semiconsolidated sand aquifers gwava-dw_semc > (yes/no) > 8 sandstone and
carbonate rocks gwava-dw_sscb > (yes/no) > 9 drainage ditch (km2) gwava-dw_ddit > 10 Hortonian overland flow gwava-dw_hor
> (percent of streamflow) > >Attenuation Factors > 11 fresh surface water withdrawal gwava-dw_swus > for irrigation
(megaliters/day) > 12 irrigation tailwater recovery (km2) gwava-dw_twre > 13 Dunne overland flow gwava-dw_dun > (percent
of streamflow) > 14 well depth (meters) - "Farm fertilizer" is the average annual nitrogen input from commercial
fertilizer applied to agricultural lands, 1992-2001, in kilograms per hectare. "Confined manure" is the average
annual nitrogen input from confined animal manure, 1992 and 1997, in kilograms per hectare. "Orchards/vineyards"
is the percent of orchards/vineyards land cover classification. "Population density" is 1990 block group population
density, in people per square kilometer. "Water input" is the ratio of the total area of irrigated land to precipitation,
in square kilometers per centimeter. "Glacial till" is the presence or absence of poorly sorted glacial till east
of the Rocky Mountains. "Semiconsolidated sand aquifers" is the presence or absence of semiconsolidated sand aquifers.
"Sandstone and carbonate rocks" is the presence or absence of sandstone and carbonate rock aquifers. "Drainage
ditch" is the area of National Resources Inventory surface drainage, field ditch conservation practice, in square kilometers.
"Hortonian overland flow" is infiltration excess overland flow estimated by TOPMODEL, in percent of streamflow.
"Fresh surface water withdrawal for irrigation" is the amount of fresh surface water withdrawal for irrigation,
in megaliters per day. "Irrigation tailwater recovery" is the area of National Resources Inventory irrigation system,
tailwater recovery conservation practice, in square kilometers. "Dunne overland flow" is saturation overland flow
estimated by TOPMODEL, in percent of streamflow. "Well depth" is the depth of the well, in meters. Well depth was
not compiled as a spatial data set. Well depth equals 50 meters for the model simulation being presented. Reference cited:
Nolan, B.T. and Hitt, K.J., 2006, Vulnerability of shallow ground water and drinking-water wells to nitrate in the United
States: Environmental Science and Technology, vol. 40, no. 24, pages 7834-7840.; abstract: This data set represents predicted
nitrate concentration in ground water used for drinking, in milligrams per liter, in the conterminous United States, and was
generated by a national nonlinear regression model based on 14 input parameters. Nolan and Hitt (2006) developed two national
models to predict contamination of ground water by nonpoint sources of nitrate. The nonlinear approach to national-scale Ground-WAter
Vulnerability Assessment (GWAVA) uses components representing nitrogen (N) sources, transport, and attenuation. One model
(GWAVA-S) predicts nitrate contamination of shallow (typically less than 5 meters deep), recently recharged ground water,
which may or may not be used for drinking. The other (GWAVA-DW) predicts ambient nitrate concentration in deeper supplies
used for drinking. This data set is a national map of nitrate concentration (in milligrams per liter) in U.S ground water
used for drinking as predicted by the GWAVA-DW model. The data set is one of 14 spatial data sets (1 output data set and 13
input data sets) associated with the GWAVA-DW model. Full details of the model development are in Nolan and Hitt (2006). This
data set represents the model output, which is depicted in figure 3 of Nolan and Hitt (2006) that shows predicted nitrate
concentration in milligrams per liter in ground water used for drinking. The model results can be used to indicate areas of
the Nation that may be vulnerable to nitrate contamination. For inputs to the model, spatial attributes representing 13 nitrogen
loading and transport and attenuation factors were compiled as raster data sets (1-km by 1-km grid cell size) for the conterminous
United States (see table 1). >Table 1.-- Parameters of nonlinear regression model for > nitrate in ground water used
for drinking (GWAVA-DW) > and corresponding input spatial data sets. > [kg, kilograms; km2, square kilometers.] >
>Nitrogen Source Factors Data Set Name > 1 farm fertilizer (kg/hectare) gwava-dw_ffer > 2 confined manure (kg/hectare)
gwava-dw_conf > 3 orchards/vineyards (percent) gwava-dw_orvi > 4 population density (people/km2) gwava-dw_popd >
>Transport to Aquifer Factors > 5 water input (km2/cm) gwava-dw_wtin > 6 glacial till (yes/no) gwava-dw_gtil >
7 semiconsolidated sand aquifers gwava-dw_semc > (yes/no) > 8 sandstone and carbonate rocks gwava-dw_sscb > (yes/no)
> 9 drainage ditch (km2) gwava-dw_ddit > 10 Hortonian overland flow gwava-dw_hor > (percent of streamflow) > >Attenuation
Factors > 11 fresh surface water withdrawal gwava-dw_swus > for irrigation (megaliters/day) > 12 irrigation tailwater
recovery (km2) gwava-dw_twre > 13 Dunne overland flow gwava-dw_dun > (percent of streamflow) > 14 well depth (meters)
- "Farm fertilizer" is the average annual nitrogen input from commercial fertilizer applied to agricultural lands,
1992-2001, in kilograms per hectare. "Confined manure" is the average annual nitrogen input from confined animal
manure, 1992 and 1997, in kilograms per hectare. "Orchards/vineyards" is the percent of orchards/vineyards land
cover classification. "Population density" is 1990 block group population density, in people per square kilometer.
"Water input" is the ratio of the total area of irrigated land to precipitation, in square kilometers per centimeter.
"Glacial till" is the presence or absence of poorly sorted glacial till east of the Rocky Mountains. "Semiconsolidated
sand aquifers" is the presence or absence of semiconsolidated sand aquifers. "Sandstone and carbonate rocks"
is the presence or absence of sandstone and carbonate rock aquifers. "Drainage ditch" is the area of National Resources
Inventory surface drainage, field ditch conservation practice, in square kilometers. "Hortonian overland flow" is
infiltration excess overland flow estimated by TOPMODEL, in percent of streamflow. "Fresh surface water withdrawal for
irrigation" is the amount of fresh surface water withdrawal for irrigation, in megaliters per day. "Irrigation tailwater
recovery" is the area of National Resources Inventory irrigation system, tailwater recovery conservation practice, in
square kilometers. "Dunne overland flow" is saturation overland flow estimated by TOPMODEL, in percent of streamflow.
"Well depth" is the depth of the well, in meters. Well depth was not compiled as a spatial data set. Well depth
equals 50 meters for the model simulation being presented. Reference cited: Nolan, B.T. and Hitt, K.J., 2006, Vulnerability
of shallow ground water and drinking-water wells to nitrate in the United States: Environmental Science and Technology, vol.
40, no. 24, pages 7834-7840.
Citation
- Title Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate
concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Model output data set (gwava-dw_out).
-
- creation Date
2018-05-21T12:29:06.410668
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Metadata data stamp:
2018-08-06T23:21:50Z
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- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T23:21:50Z
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pointOfContact
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CINERGI Metadata catalog
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eng
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Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:fd9052db-0fb5-41bf-af08-ab1bfbcc17d0
Metadata record format is ISO19139 XML (MD_Metadata)