Layer: Rivers/Streams (ID:1)

View In: Map Viewer

Name: Rivers/Streams

Display Field: OrganizationFormalName

Type: Feature Layer

Geometry Type: esriGeometryPoint

Is View: true

Is Updatable View: true

Source Schema Changes Allowed: true

Sources

Description: The "National Measured Conductivity Data - WQP" view in the Freshwater Explorer is based on measured data obtained from the <a href="https://www.waterqualitydata.us/" style="color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;" target="_blank">U.S. EPA Water Quality Portal (WQP)</a> data inventory - the nation's largest source for water quality monitoring data. Data were downloaded from the WQP website using the following query criteria: <ul><li>Country - United States.</li><li>Sample Media - Water. </li><li>Characteristics - Conductivity, Specific Conductivity, Specific Conductance, Calculated/Measured Ratio.</li><li>Date range - 1 January 2000 to 20 July 2021.</li></ul>These water quality data records are provided by many federal, state and tribal organizations and other partners. As such, the U.S. EPA cannot ensure that the information is accurate, current or complete. Therefore, users should verify the data from the original sources before drawing site specific conclusions. Examples of errors found include negative specific conductivity (SC) values, units of measurements not consistent with SC measurements (e.g., NTU, volts, mg/l) and entries as mS/cm but reported as µS/cm. The U.S. EPA plans to update data and add new data; however, due to the large number of organizations involved, such an effort is beyond the scope of this story map. Users should verify the data from the original sources before drawing site specific conclusions.<div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;"> </div><div style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">An inventory of the SC data affected by such uncertainties has been compiled and a thorough data revision process has been planned to contact the individual organizations that provided the data and to regularly up-date data. However, due to the large number of organizations involved, it is necessary that users of the National Conductivity Data assume there will be some inherent measuring and reporting error. The quality of the measured data was evaluated as follows. An automated Quality Assurance/Quality Control (QA/QC) protocol was developed using R-scripts to remove or identify potentially erroneous SC values (outliers) in WQP. The objective of the QA/QC protocol was to:<ul><li>Remove SC values ≤ 0 (SC values cannot be negative). </li><li>Remove SC values reported with units of measurements different from Siemens or mho - these were considered ambiguous (e.g., SC reported as nephelometric turbidity units, degrees etc.). </li><li>Convert all relevant SC values to µS/cm (e.g., values expressed in mS/cm were multiplied by 1000). This allows direct comparison among samples. </li><li>Identify and flag (grey circles) SC values < 10 µS/cm - these SC values are uncertain and likely recorded incorrectly as µS/cm instead of mS/cm units. </li><li>Identify and flag (grey circles) SC values > 5000 µS/cm - these SC values likely represent marine waters or are errors in reported units of measurements (data reported as mS/cm but likely measured as µS/cm). It should be noted, however, that some SC values > 5000 µS/cm may have been correctly reported (e.g., brine waste outfalls, irrigation return water).</li></ul>The data set is updated from time to time but is always very large. The initial dataset in 2021 contained almost 13 million records downloaded from WQP. About 160 thousand SC measurements were removed (incorrect units or erroneous values). More than 2 million values, representing about 25%, were flagged as uncertain (gray color). The subsequent QA/QC dataset contained about 9 million samples from more than 200,000 locations. The R code developed to perform the QA/QC steps are available from <a href="https://epa.maps.arcgis.com/home/item.html?id=75d8596e313b430d9181feed4da8667b" style="color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;" target="_blank">cormier.susan@epa.gov</a></div>

Copyright Text: Cormier, S. M., Wharton, C., and Olson, J.R.

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

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HasZ: true

HasM: true

Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Object ID Field: OBJECTID

Unique ID Field:

Global ID Field: GlobalID

Type ID Field:

Fields:

OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
OrganizationIdentifier (type: esriFieldTypeString, alias: Organization Abbreviation, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
OrganizationFormalName (type: esriFieldTypeString, alias: Organization Name, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
MonitoringLocationIdentifier (type: esriFieldTypeString, alias: StationID, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
MonitoringLocationName (type: esriFieldTypeString, alias: Monitoring Location Name, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
LatitudeMeasure (type: esriFieldTypeDouble, alias: LatitudeMeasure, SQL Type: sqlTypeOther, nullable: true, editable: true)
LongitudeMeasure (type: esriFieldTypeDouble, alias: LongitudeMeasure, SQL Type: sqlTypeOther, nullable: true, editable: true)
ProviderName (type: esriFieldTypeString, alias: Provider Name, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
State (type: esriFieldTypeString, alias: State, SQL Type: sqlTypeOther, length: 8000, nullable: true, editable: true)
SiteType (type: esriFieldTypeString, alias: Station Type, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
COMID (type: esriFieldTypeInteger, alias: COMID, SQL Type: sqlTypeOther, nullable: true, editable: true)
StreamName (type: esriFieldTypeString, alias: Stream Name, SQL Type: sqlTypeOther, length: 65, nullable: true, editable: true)
AvgPredEC (type: esriFieldTypeDouble, alias: Average Predicted Background Conductivity, SQL Type: sqlTypeOther, nullable: true, editable: true)
Conductivity_Samples (type: esriFieldTypeDouble, alias: Conductivity Samples, SQL Type: sqlTypeOther, nullable: true, editable: true)
Mean (type: esriFieldTypeDouble, alias: Mean, SQL Type: sqlTypeOther, nullable: true, editable: true)
Minimum (type: esriFieldTypeDouble, alias: Min, SQL Type: sqlTypeOther, nullable: true, editable: true)
Maximum (type: esriFieldTypeDouble, alias: Max, SQL Type: sqlTypeOther, nullable: true, editable: true)
Last_Measurement_Date (type: esriFieldTypeDate, alias: Last Measurement Date, SQL Type: sqlTypeOther, length: 8, nullable: true, editable: true)
Median (type: esriFieldTypeDouble, alias: Median, SQL Type: sqlTypeOther, nullable: true, editable: true)
Last_Measured_Conductivity (type: esriFieldTypeDouble, alias: Last Measured Conductivity, SQL Type: sqlTypeOther, nullable: true, editable: true)
GlobalID (type: esriFieldTypeGlobalID, alias: GlobalID, SQL Type: sqlTypeOther, length: 38, nullable: false, editable: false)
RegionEPA (type: esriFieldTypeString, alias: RegionEPA, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)

Templates:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 3/14/2024 7:00:34 PM

Schema Last Edit Date: 3/14/2024 7:00:34 PM

Data Last Edit Date: 3/14/2024 7:00:34 PM

Supported Operations: Query Query Top Features Query Analytic Query Bins Generate Renderer Validate SQL Get Estimates ConvertFormat