Name: Impaired Watersheds 2018
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Description: Spatial dataset created by BMC by relating Maryland Integrated Report Waterbody Pollutant Layers for Categories 4a, 4b, 4c, and 5 to Maryland Watersheds - 8 Digit Watersheds (polygons).Base layer: MDE_MD_8DigitWatersheds (Maryland Watersheds - 8 Digit Watersheds) from 09/16/2019 on SDE.Categorized by Integrated Report data: 2018 Integrated Report and TDML data downloadable through the Water Quality Assessments (IR) and TMDLs interactive map: https://mdewin64.mde.state.md.us/WSA/IR-TMDL/index.htmlFull Final 2018 Integrated Report of Surface Water Quality: https://mde.maryland.gov/programs/Water/TMDL/Integrated303dReports/Pages/2018IR.aspxWATERBODY POLLUTANT LAYERSRiver_Nitrogen_Total_2018: Nitrogen, TotalRiver_Phosphorus_Total_2018: Phosphorus, TotalRiver_Total_Suspended_Solids_2018: Total Suspended Solids (TSS)Tidal_Nitrogen_Total_2018: Nitrogen, TotalTidal_Phosphorus_Total_2018: Phosphorus, TotalTidal_Total_Suspended_Solids_2018: Total Suspended Solids (TSS)IMPAIRMENT CATEGORIESOnly impairment categories 4a, 4b, 4c, and 5 are included in this dataset. (Categories 4b and 4c do not occur for these pollutants in Maryland.)https://www.epa.gov/nutrient-policy-data/waters-assessed-impaired-due-nutrient-related-causesCategory 1: Attaining all designated usesCategory 2: Attaining some designated uses, and insufficient or no data information to determine if remaining uses are attainedCategory 3: Insufficient or no data and information to determine if any use is attainedCategory 4: Impaired or threatened for one or more uses but not needing a TMDL becausea) TMDL has been completedb) Expected to meet standardsc) Not impaired by a pollutant Category 5: Impaired or threatened by pollutant(s) for one or more designated uses and requiring a TMDL. These are the waters entered onto a states’ 303(d) list.METHODOLOGYPollutant datasets were selected for only Categories 4a, 4b, 4c, and 5. Then data relates and/or spatial selections were used to categorize watersheds based on their types of river and tidal impairments.See Long Range Plan (Resilience 2050) for more information: P:\Trans\Technical\Data Development\Internal\LongRangePlan\Resilience2050\_ImpairedWatersheds_2018
Copyright Text: Maryland Department of Environment
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