{PAGE NAME} | {WEB AREA NAME}

EM Identity and Description

EM Identification (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Short Name em.detail.shortNameHelp ?	EnviroAtlas-Nat. filtration-water	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US	EnviroAtlas-Nat. filtration-water, Durham, N.C. US
EM Full Name em.detail.fullNameHelp ?	US EPA EnviroAtlas - Natural filtration (of water by tree cover); Example is shown for Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA	US EPA EnviroAtlas - Natural filtration (water by tree cover), Durham NC and vicinity, USA
EM Source or Collection em.detail.emSourceOrCollectionHelp ?	US EPA \| EnviroAtlas \| i-Tree ? Comment: EnviroAtlas uses an application of the i-Tree Hydro model.	*	*	*	*	*	*	*	*
EM Source Document ID	223	*	*	*	*	*	*	*	*
Document Author em.detail.documentAuthorHelp ?	US EPA Office of Research and Development - National Exposure Research Laboratory	*	*	*	*	*	*	*	*
Document Year em.detail.documentYearHelp ?	2013	*	*	*	*	*	*	*	*
Document Title em.detail.sourceIdHelp ?	EnviroAtlas - Featured Community	*	*	*	*	*	*	*	*
Document Status em.detail.statusCategoryHelp ?	Peer reviewed and published	*	*	*	*	*	*	*	*
Comments on Status em.detail.commentsOnStatusHelp ?	Published on US EPA EnviroAtlas website	*	*	*	*	*	*	*	*

Software and Access (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Software Access info Exit em.detail.modelAccessInformationHelp ?	https://www.epa.gov/enviroatlas	*	*	*	*	*	*	*	*
Contact Name em.detail.contactNameHelp ?	EnviroAtlas Team	*	*	*	*	*	*	*	*
Contact Address	Not reported	*	*	*	*	*	*	*	*
Contact Email	enviroatlas@epa.gov	*	*	*	*	*	*	*	*

EM Description (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Summary Description em.detail.summaryDescriptionHelp ?	The Natural Filtration model has been used to create coverages for several US communities. An example for Durham, NC is shown in this entry. METADATA ABSTRACT: "This EnviroAtlas dataset presents environmental benefits of the urban forest in 193 block groups in Durham, North Carolina... runoff effects are calculated for each block group using i-Tree models (www.itreetools.org), local weather data, pollution data, EPA provided city boundary and land cover data, and U.S. Census derived block group boundary data. This dataset was produced by the US Forest Service to support research and online mapping activities related to EnviroAtlas." METADATA DESCRIPTION: "The i-Tree Hydro model estimates the effects of tree and impervious cover on hourly stream flow values for a watershed (Wang et al 2008). i-Tree Hydro also estimates changes in water quality using hourly runoff estimates and mean and median national event mean concentration (EMC) values. The model was calibrated using hourly stream flow data to yield the best fit between model and measured stream flow results… After calibration, the model was run a number of times under various conditions to see how the stream flow would respond given varying tree and impervious cover in the watershed… The term event mean concentration (EMC) is a statistical parameter used to represent the flow-proportional average concentration of a given parameter during a storm event. EMC data is used for estimating pollutant loading into watersheds. The response outputs were calculated as kg of pollutant per square meter of land area for pollutants. These per square meter values were multiplied by the square meters of land area in the block group to estimate the effects at the block group level." METADATA DESCRIPTION PARAPHRASED: Changes in water quality were estimated for the following pollutants (entered as separate runs); total suspended solids (TSS), total phosphorus, soluble phosphorus, nitrites and nitrates, total Kjeldahl nitrogen (TKN), biochemical oxygen demand (BOD5), chemical oxygen demand (COD5), and copper. "Reduction in annual runoff (census block group)" variable data was derived from the EnviroAtlas water recharge coverage which used the i-Tree Hydro model.	*	*	*	*	*	*	*	METADATA ABSTRACT: "This EnviroAtlas dataset presents environmental benefits of the urban forest in 193 block groups in Durham, North Carolina... runoff effects are calculated for each block group using i-Tree models (www.itreetools.org), local weather data, pollution data, EPA provided city boundary and land cover data, and U.S. Census derived block group boundary data. This dataset was produced by the US Forest Service to support research and online mapping activities related to EnviroAtlas." METADATA DESCRIPTION: "The i-Tree Hydro model estimates the effects of tree and impervious cover on hourly stream flow values for a watershed (Wang et al 2008). i-Tree Hydro also estimates changes in water quality using hourly runoff estimates and mean and median national event mean concentration (EMC) values. The model was calibrated using hourly stream flow data to yield the best fit between model and measured stream flow results… After calibration, the model was run a number of times under various conditions to see how the stream flow would respond given varying tree and impervious cover in the watershed… The term event mean concentration (EMC) is a statistical parameter used to represent the flow-proportional average concentration of a given parameter during a storm event. EMC data is used for estimating pollutant loading into watersheds. The response outputs were calculated as kg of pollutant per square meter of land area for pollutants. These per square meter values were multiplied by the square meters of land area in the block group to estimate the effects at the block group level." METADATA DESCRIPTION PARAPHRASED: Changes in water quality were estimated for the following pollutants (entered as separate runs); total suspended solids (TSS), total phosphorus, soluble phosphorus, nitrites and nitrates, total Kjeldahl nitrogen (TKN), biochemical oxygen demand (BOD5), chemical oxygen demand (COD5), and copper.
Specific Policy or Decision Context Cited em.detail.policyDecisionContextHelp ?	None identified	*	*	*	*	*	*	*	*
Biophysical Context	No additional description provided	*	*	*	*	*	*	*	*
EM Scenario Drivers em.detail.scenarioDriverHelp ?	No scenarios presented	*	*	*	*	*	*	*	*

EM Relationship to Other EMs or Applications

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Method Only, Application of Method or Model Run em.detail.methodOrAppHelp ?	Method + Application (multiple runs exist)	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application	Model Run Associated with a Specific EM Application
New or Pre-existing EM? em.detail.newOrExistHelp ?	Application of existing model	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load

Related EMs (for example, other versions or derivations of this EM) described in ESML

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Document ID for related EM em.detail.relatedEmDocumentIdHelp ?	Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198	Doc-190 \| Doc-198
EM ID for related EM em.detail.relatedEmEmIdHelp ?	EM-137 \| EM-142	None	None	None	None	None	None	None	None

EM Modeling Approach

EM Relationship to Time (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Temporal Extent em.detail.tempExtentHelp ?	1999-2010	*	*	*	*	*	*	*	*
EM Time Dependence em.detail.timeDependencyHelp ?	time-stationary ? Comment: The underlying i-Tree Hydro model, used to generate the annual flows for which EMCs were ultimately applied, operated on an hourly timestep. The final annual flow parameter however is time stationary.	*	*	*	*	*	*	*	*
EM Time Reference (Future/Past) em.detail.futurePastHelp ?	Not applicable	*	*	*	*	*	*	*	*
EM Time Continuity em.detail.continueDiscreteHelp ?	Not applicable	*	*	*	*	*	*	*	*
EM Temporal Grain Size Value em.detail.tempGrainSizeHelp ?	Not applicable	*	*	*	*	*	*	*	*
EM Temporal Grain Size Unit em.detail.tempGrainSizeUnitHelp ?	Not applicable	*	*	*	*	*	*	*	*

EM spatial extent (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Bounding Type em.detail.boundingTypeHelp ?	Geopolitical	*	*	*	*	*	*	*	*
Spatial Extent Name em.detail.extentNameHelp ?	Durham, NC and vicinity	*	*	*	*	*	*	*	*
Spatial Extent Area (Magnitude) em.detail.extentAreaHelp ?	100-1000 km^2	*	*	*	*	*	*	*	*

Spatial Distribution of Computations (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Spatial Distribution em.detail.distributeLumpHelp ?	spatially distributed (in at least some cases)	*	*	*	*	*	*	*	*
Spatial Grain Type em.detail.spGrainTypeHelp ?	other (specify), for irregular (e.g., stream reach, lake basin)	*	*	*	*	*	*	*	*
Spatial Grain Size em.detail.spGrainSizeHelp ?	irregular	*	*	*	*	*	*	*	*

EM Structure and Computation Approach (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Computational Approach em.detail.emComputationalApproachHelp ?	Analytic ? Comment: The underlying i-Tree Hydro model, used to generate the annual flows for which EMCs were ultimately applied, was numeric. The final parameter however did not require iteration.	*	*	*	*	*	*	*	*
EM Determinism em.detail.deterStochHelp ?	deterministic	*	*	*	*	*	*	*	*
Statistical Estimation of EM em.detail.statisticalEstimationHelp ?	Conventional (frequentist) statistics	*	*	*	*	*	*	*	*

Model Checking Procedures Used (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Model Calibration Reported? em.detail.calibrationHelp ?	Unclear	*	*	*	*	*	*	*	*
Model Goodness of Fit Reported? em.detail.goodnessFitHelp ?	No	*	*	*	*	*	*	*	*
Goodness of Fit (metric\| value \| unit) em.detail.goodnessFitValuesHelp ?	None	*	*	*	*	*	*	*	*
Model Operational Validation Reported? em.detail.validationHelp ?	Unclear	*	*	*	*	*	*	*	*
Model Uncertainty Analysis Reported? em.detail.uncertaintyAnalysisHelp ?	Unclear	*	*	*	*	*	*	*	*
Model Sensitivity Analysis Reported? em.detail.sensAnalysisHelp ?	Unclear	*	*	*	*	*	*	*	*
Model Sensitivity Analysis Include Interactions? em.detail.interactionConsiderHelp ?	Not applicable	*	*	*	*	*	*	*	*

EM Locations, Environments, Ecology

Location of EM Application (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

Terrestrial location (Classification hierarchy: Continent > Country > U.S. State [United States only])

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
North America United States North Carolina	*	*	*	*	*	*	*	*

Marine location (Classification hierarchy: Realm > Region > Province > Ecoregion)

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
None	*	*	*	*	*	*	*	*

Centroid Lat/Long (Decimal Degree)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Centroid Latitude em.detail.ddLatHelp ?	35.99	*	*	*	*	*	*	*	*
Centroid Longitude em.detail.ddLongHelp ?	-78.96	*	*	*	*	*	*	*	*
Centroid Datum em.detail.datumHelp ?	None provided	*	*	*	*	*	*	*	*
Centroid Coordinates Status em.detail.coordinateStatusHelp ?	Estimated	*	*	*	*	*	*	*	*

Environments and Scales Modeled (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Environmental Sub-Class em.detail.emEnvironmentalSubclassHelp ?	Rivers and Streams \| Created Greenspace	*	*	*	*	*	*	*	*
Specific Environment Type em.detail.specificEnvTypeHelp ?	Urban areas including streams	*	*	*	*	*	*	*	*
EM Ecological Scale em.detail.ecoScaleHelp ?	Not applicable	*	*	*	*	*	*	*	*

Organisms modeled (* Note that run information is shown only where run data differ from the "parent" entry shown at left)

Scale of differentiation of organisms modeled

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
EM Organismal Scale em.detail.orgScaleHelp ?	Not applicable	*	*	*	*	*	*	*	*

Taxonomic level and name of organisms or groups identified

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
None Available	*	*	*	*	*	*	*	*

EnviroAtlas URL

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
None Available	None Available	None Available	None Available	None Available	None Available	None Available	None Available	None Available

EM Ecosystem Goods and Services (EGS) potentially modeled, by classification system

* Note that run information is shown only where run data differ from the "parent" entry shown at left

CICES v 4.3 - Common International Classification of Ecosystem Services (Section > Division > Group > Class)

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
[Ecosystem] Regulation & Maintenance Maintenance of physical, chemical, biological conditions Water conditions Chemical condition of freshwaters Mediation of waste, toxics and other nuisances Mediation by biota Filtration/sequestration/storage/accumulation by micro-organisms, algae, plants, and animals	*	*	*	*	*	*	*	*

National Ecosystem Services Classification System (NESCS) Plus

(Environmental Subclass > Ecological End-Product (EEP) > EEP Subclass > EEP Modifier)

EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Rivers and Streams (111) Water (3) Liquid water Quality Indicator Urban/Suburban (27) Composite (8) Presence of environmental class/subclass Quality Indicator	*	*	*	*	*	*	*	*

EM Variable Names (and Units)

* Note that for runs, variable name is displayed only where data for that variable differed by run AND those differences were reported in the source document. Where differences occurred but were not reported, the variable is not listed. Click on variable name to view details.

To view run information for variables, select any variable below or view run data for all variables.

Predictor

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Driving Variables (and Units) em.detail.drivingVariableHelp ?	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Pollutant (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)	Census block group (Not applicable) Reduction in annual runoff (census block group) (m^3 yr^-1)
Constant or Factor Variables (and Units) em.detail.constantFactorVariableHelp ?	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)	Pollutant pooled mean event-mean concentration (mg l^-1) Pollutant pooled median event-mean concentration (mg l^-1)

Intermediate

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Intermediate (Computed) Variables (and Units) em.detail.intermediateVariableHelp ?	None	*	*	*	*	*	*	*	*

Response

EM ID em.detail.idHelp ?	EM-51	Run - Reduction in total suspended solids load	Run- Reduction in total phosphorus load	Run- Reduction in soluble phosphorus load	Run- Reduction in nitrites and nitrates load	Run- Reduction in total Kjeldahl nitrogen load	Run- Reduction in biochemical oxygen demand load	Run- Reduction in chemical oxygen demand load	Run- Reduction in copper load
Observed Response Variables (and Units) em.detail.observedResponseHelp ?	None	*	*	*	*	*	*	*	*
Computed Response Variables (and Units) em.detail.computedResponseHelp ?	Reduction in pollutant mean load (census block group) (kg/year) Reduction in pollutant median load (census block group) (kg/year)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)	Reduction in pollutant mean load (census block group) (kg yr^-1) Reduction in pollutant median load (census block group) (kg yr^-1)

US EPA

EcoService Models Library (ESML)

View Runs

: US EPA EnviroAtlas - Natural filtration (of water by tree cover); Example is shown for Durham NC and vicinity, USA (EM-51)

EM Identity and Description

Comment:

Related EMs (for example, other versions or derivations of this EM) described in ESML

EM Modeling Approach

Comment:

Comment:

EM Locations, Environments, Ecology

Terrestrial location (Classification hierarchy: Continent > Country > U.S. State [United States only])

Marine location (Classification hierarchy: Realm > Region > Province > Ecoregion)

Centroid Lat/Long (Decimal Degree)

Scale of differentiation of organisms modeled

Taxonomic level and name of organisms or groups identified

EnviroAtlas URL

EM Ecosystem Goods and Services (EGS) potentially modeled, by classification system

* Note that run information is shown only where run data differ from the "parent" entry shown at left

CICES v 4.3 - Common International Classification of Ecosystem Services (Section > Division > Group > Class)

National Ecosystem Services Classification System (NESCS) Plus

(Environmental Subclass > Ecological End-Product (EEP) > EEP Subclass > EEP Modifier)

EM Variable Names (and Units)

* Note that for runs, variable name is displayed only where data for that variable differed by run AND those differences were reported in the source document. Where differences occurred but were not reported, the variable is not listed. Click on variable name to view details.

Predictor

Intermediate

Response