Description: This layer provides the linework for all flowing non-tidal waters biolchemical oxygen demand (BOD) assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the stream linework for this file and was used to geospatially describe Maryland's water quality assessments for a variety of pollutants. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal area representing all tidal waters for BOD assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD was used for the polygonal areas of the coastal bays and oceans used to geospatially describe Maryland's water quality assessments for a variety of pollutants. MDE also acknowledges the Chesapeake Bay Foundation as their tidal bay segmentation file that was used to represent the polygonal areas of the Chesapeake Bay. These files were then merged with NHD and linked with the IR assessment information.
Description: This layer provides the polygonal areas for all impoundments in the state of Maryland for chlorophyll-a assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the derivedpolygonal areas for this file and was used to geospatially describe most of Maryland's impoundments; however, MDE had to manually create the boundaries for some impoundments due to the inaccuracies within the NHD. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: Polygon feature class of watersheds with EPA approved BOD TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved BOD TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: This layer provides the linework for all flowing non-tidal waters nitrogen assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the stream linework for this file and was used to geospatially describe Maryland's water quality assessments for a variety of pollutants. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal areas for all impoundments in the state of Maryland for nitrogen assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the derivedpolygonal areas for this file and was used to geospatially describe most of Maryland's impoundments; however, MDE had to manually create the boundaries for some impoundments due to the inaccuracies within the NHD. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal area representing all tidal waters for nitrogen assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD was used for the polygonal areas of the coastal bays and oceans used to geospatially describe Maryland's water quality assessments for a variety of pollutants. MDE also acknowledges the Chesapeake Bay Foundation as their tidal bay segmentation file that was used to represent the polygonal areas of the Chesapeake Bay. These files were then merged with NHD and linked with the IR assessment information.
Description: Polygon feature class of watersheds with EPA approved Nitrogen TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved Nitrogen TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: This layer provides the linework for all flowing non-tidal waters phosphorus assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the stream linework for this file and was used to geospatially describe Maryland's water quality assessments for a variety of pollutants. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal areas for all impoundments in the state of Maryland for phosphorus assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the derivedpolygonal areas for this file and was used to geospatially describe most of Maryland's impoundments; however, MDE had to manually create the boundaries for some impoundments due to the inaccuracies within the NHD. The Maryland Department of the Environment Science Services Administration linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal area representing all tidal waters for phosphorus assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Definition Expression: N/A
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD was used for the polygonal areas of the coastal bays and oceans used to geospatially describe Maryland's water quality assessments for a variety of pollutants. MDE also acknowledges the Chesapeake Bay Foundation as their tidal bay segmentation file that was used to represent the polygonal areas of the Chesapeake Bay. These files were then merged with NHD and linked with the IR assessment information.
Description: Polygon feature class of watersheds with EPA approved Phosphorus TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved Phosphorus TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved Phosphorus TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Definition Expression: N/A
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program