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Variables Details
: (EM-938)
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EM Identity and Description
| EM-938 | |
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Document Author
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Eslinger, David L., H. Jamieson Carter, Matt Pendleton, Shan Burkhalter, Margaret Allen |
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Document Year
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2012 |
Variable General Info
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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Variable ID
variable.detail.varIdHelp
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23095 | 23109 | 23107 | 23096 |
| Not reported | Not reported | Not reported | K factor | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Qualitative (Class, Rating or Ranking) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Non-Ordinal | Cardinal | Cardinal | Cardinal |
| Not applicable | mg L^-1 | no. yr^-1 | (ton*ac*hr) / (ac*tonft*ft*in) |
Variable Typology
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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Predictor-Intermediate-Response
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Predictor |
Predictor |
Predictor |
Predictor |
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Predictor Variable Type
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Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter |
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Response Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable |
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Data Source/Type
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Not applicable | Not applicable | Not applicable | Not applicable |
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Variable Classification Hierarchy
variable.detail.vchLevel1Help
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
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--Physical/chemical characteristics of nonliving ecosystem components |
--Human-caused release, presence or characteristics of polluting substances |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
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----Physical/chemical characteristics of soils, substrates, rocks |
----Other, multiple, unspecified or unclear |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of soils, substrates, rocks |
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------Soil hydrologic characteristics |
------Meteorology data and parameters (including precipitation) |
------Soil, slope or land stability or erosiveness |
Variable Spatial Characteristics
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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Spatial Extent Area
variable.detail.spExtentHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Spatially Distributed?
variable.detail.spDistributedHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Spatial Density
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Average Annual Precipitation |
Variable Temporal Characteristics
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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Temporal Extent
variable.detail.tempExtentHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Temporally Distributed?
variable.detail.tempDistributedHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Temporal Density
variable.detail.tempDensityHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Variable Values
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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| Not applicable | Not applicable | Not applicable | Not applicable | |
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Min Value
variable.detail.minEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable |
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Max Value
variable.detail.estHelp
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Not applicable | Not applicable | Not applicable | Not applicable |
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Other Value Type
variable.detail.natureOtherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable |
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Other Value
variable.detail.otherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable |
Variable Variability and Sensitivity
Hydrologic soil group ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Infiltration capacity data are typically summarized in four hydrologic soil groups and are used to pick specific curve numbers for a given land use and land cover (LULC) class. The soils configuration specifies the grid that contains spatial values for the hydrologic soil types (A, B, C, or D, depending on the soil’s infiltration rates) in the area of interest. |
Pollutant concentration coefficient ?Comment:Pollutant export coefficients are used to calculate pollutant loads from each LULC class in a study area.The value of this variable is a constant with respect to the class variable: Land cover. OpenNSPECT estimates pollutant concentrations by using land cover as a proxy. This is accomplished by applying pollutant contribution coefficients (similar to event mean concentrations) to land cover classes and introducing a runoff volume grid. OpenNSPECT estimates concentrations for four default pollutants (nitrogen, phosphorus, lead, and zinc), as well as additional user-specified pollutants. A pollutant concentration grid is then created from either the default pollutant coefficients or a new set derived from local sampling data where each cell is assigned a value based on its land cover classification. The pollutant coefficient value represents an average concentration (milligrams/liter) for a given land cover classification. |
Raining days ?Comment:OpenNSPECT calculates both event and annual runoff scenarios. For annual runoff scenarios, users must also estimate the number of days that yielded surface runoff within a year. This number indicates the average number of storms that occur in a one-year period in the area of interest. This parameter is very sensitive and typically requires careful consideration. While it isn’t recommended that users simply adjust this value to calibrate OpenNSPECT to local conditions, users are encouraged to employ creative methods to accurately reflect spatial variation in raining days. |
Soil erodibility ?Comment:The value of this variable is constant with respect to the class variable: Soil type. Soil erodibility data, often referred to as soil K-factor data, are used as scaling factors in the erosion algorithms. The soils configuration specifies the grid that contains spatial values for the K factor (soil erodibility factor) in the area of interest. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Variability Metric
variable.detail.variabilityMetricHelp
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None | None | None | None |
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Variability Value
variable.detail.variabilityValueHelp
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None | None | None | None |
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Variability Units
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None | None | None | None |
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Resampling Used?
variable.detail.bootstrappingHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Variable Operational Validation (Response Variables only)
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Variable ID
variable.detail.varIdHelp
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Validated?
variable.detail.resValidatedHelp
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Validation Approach (within, between, etc.)
variable.detail.validationApproachHelp
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Validation Quality (Qual/Quant)
variable.detail.validationQualityHelp
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Validation Method (Stat/Deviance)
variable.detail.validationMethodHelp
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Validation Metric
variable.detail.validationMetricHelp
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Validation Value
variable.detail.validationValHelp
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Validation Units
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Use of Measured Response Data
variable.detail.measuredResponseDataHelp
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