Dataset Identification:
Resource Abstract:
- description: This data set represents the amount of fresh surface water withdrawal for irrigation, in megaliters per day,
in the conterminous United States. The data set was used as an input data layer for a national model to predict nitrate concentration
in shallow ground water. 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 one of 17 data sets
(1 output data set and 16 input data sets) associated with the GWAVA-S model. Full details of the model development are in
Nolan and Hitt (2006). For inputs to the model, spatial attributes representing 16 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 shallow > ground water (GWAVA-S) and corresponding
input spatial data sets. > [kg, kilograms; km2, square kilometers.] > >Nitrogen Source Factors Data Set Name >
1 farm fertilizer (kg/hectare) gwava-s_ffer > 2 confined manure (kg/hectare) gwava-s_conf > 3 orchards/vineyards (percent)
gwava-s_orvi > 4 population density (people/km2) gwava-s_popd > 5 cropland/pasture/fallow (percent) gwava-s_crpa >
>Transport to Aquifer Factors > 6 water input (km2/cm) gwava-s_wtin > 7 carbonate rocks (yes/no) gwava-s_crox >
8 basalt and volcanic rocks (yes/no) gwava-s_vrox > 9 drainage ditch (km2) gwava-s_ddit > 10 slope (percent x 1000)
gwava-s_slop > 11 glacial till (yes/no) gwava-s_gtil > 12 clay sediment (percent x 1000) gwava-s_clay > >Attenuation
Factors > 13 fresh surface water withdrawal gwava-s_swus > for irrigation (megaliters/day) > 14 irrigation tailwater
recovery (km2) gwava-s_twre > 15 histosol soil type (percent) gwava-s_hist > 16 wetlands (percent) gwava-s_wetl "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. "Cropland/pasture/fallow"
is the percent of cropland/pasture/fallow land cover classifications. "Water input" is the ratio of the total area
of irrigated land to precipitation, in square kilometers per centimeter. "Carbonate rocks" is the presence or absence
of Valley and Ridge carbonate rocks. "Basalt and volcanic rocks" is the presence or absence of basalt and volcanic
rocks. "Drainage ditch" is the area of National Resources Inventory surface drainage, field ditch conservation practice,
in square kilometers. "Slope" is the soil surface slope, in percent times 1000. "Glacial till" is the
presence or absence of poorly sorted glacial till east of the Rocky Mountains. "Clay sediment" is the amount of
clay sediment in the soil, in percent times 1000. "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. "Histosol
soil type" is the amount of histosols soil taxonomic order, in percent. "Wetlands" is the percent of woody
wetlands and emergent herbaceous wetlands land cover classifications. 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 the amount of fresh surface water withdrawal for irrigation,
in megaliters per day, in the conterminous United States. The data set was used as an input data layer for a national model
to predict nitrate concentration in shallow ground water. 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 one of 17 data sets (1 output data set and 16 input data sets) associated with the GWAVA-S model. Full details of the
model development are in Nolan and Hitt (2006). For inputs to the model, spatial attributes representing 16 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 shallow > ground water
(GWAVA-S) and corresponding input spatial data sets. > [kg, kilograms; km2, square kilometers.] > >Nitrogen Source
Factors Data Set Name > 1 farm fertilizer (kg/hectare) gwava-s_ffer > 2 confined manure (kg/hectare) gwava-s_conf >
3 orchards/vineyards (percent) gwava-s_orvi > 4 population density (people/km2) gwava-s_popd > 5 cropland/pasture/fallow
(percent) gwava-s_crpa > >Transport to Aquifer Factors > 6 water input (km2/cm) gwava-s_wtin > 7 carbonate rocks
(yes/no) gwava-s_crox > 8 basalt and volcanic rocks (yes/no) gwava-s_vrox > 9 drainage ditch (km2) gwava-s_ddit >
10 slope (percent x 1000) gwava-s_slop > 11 glacial till (yes/no) gwava-s_gtil > 12 clay sediment (percent x 1000) gwava-s_clay
> >Attenuation Factors > 13 fresh surface water withdrawal gwava-s_swus > for irrigation (megaliters/day) >
14 irrigation tailwater recovery (km2) gwava-s_twre > 15 histosol soil type (percent) gwava-s_hist > 16 wetlands (percent)
gwava-s_wetl "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.
"Cropland/pasture/fallow" is the percent of cropland/pasture/fallow land cover classifications. "Water input"
is the ratio of the total area of irrigated land to precipitation, in square kilometers per centimeter. "Carbonate rocks"
is the presence or absence of Valley and Ridge carbonate rocks. "Basalt and volcanic rocks" is the presence or absence
of basalt and volcanic rocks. "Drainage ditch" is the area of National Resources Inventory surface drainage, field
ditch conservation practice, in square kilometers. "Slope" is the soil surface slope, in percent times 1000. "Glacial
till" is the presence or absence of poorly sorted glacial till east of the Rocky Mountains. "Clay sediment"
is the amount of clay sediment in the soil, in percent times 1000. "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.
"Histosol soil type" is the amount of histosols soil taxonomic order, in percent. "Wetlands" is the percent
of woody wetlands and emergent herbaceous wetlands land cover classifications. 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 shallow, recently recharged ground water -- Input data set for fresh surface water withdrawal (gwava-s_swus).
-
- creation Date
2018-05-21T11:02:17.156577
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2018-08-06T20:54:46Z
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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 2018-08-06T20:54:46Z
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CINERGI Metadata catalog
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ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:97a5cd81-b51a-4dd0-9bbb-1c6e89f40da4
Metadata record format is ISO19139 XML (MD_Metadata)