Parent Layer: Health Sub-indices

Name: Landscape Condition

Display Field: COMID

Type: Feature Layer

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>The Chesapeake Bay Program has a goal of maintaining the long-term health of watersheds identified as healthy by its partner jurisdictions. Quantitative indicators are important to assess current watershed condition, track future condition, and assess the vulnerability of these watersheds to future degradation. Building upon the U.S. Environmental Protection Agency (EPA) Preliminary Healthy Watershed Assessment (PHWA) framework, project analysts assembled and evaluated a set of candidate metrics characterizing multiple aspects of landscape condition, hydrology, geomorphology, habitat, biological condition, and water quality, for integration into an overall watershed health index. Geospatial analyses were structured, where possible, to leverage data from EPA StreamCat, the National Fish Habitat Partnership, the Chesapeake Bay model for nutrient loads, and other regional data sources. A set of vulnerability metrics were derived representing aspects of land use change, water use, wildfire risk, and climate change. Metric values were compiled for the nearly 84,000 NHDPlus catchments Bay-wide, and were used to assess conditions and vulnerability within the catchments associated with the current set of state-identified healthy watersheds. These indicators will be available to federal, state, and local managers as a geospatial tool, providing critical information for maintaining watershed health. The Chesapeake Healthy Watersheds Assessment provides a framework for tracking condition at future intervals, integrating new data that become available.</SPAN></SPAN></P></DIV></DIV></DIV>

Service Item Id: 9f37b472a20e483fa92635cd92c200b2

Copyright Text: Christopher Wharton Nancy Roth Sam Sarkar Brian Pickard, Ph.D. Ann Roseberry Lincoln Tetra Tech, Inc

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Spatial Reference: 102100  (3857)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• COMID ( type: esriFieldTypeInteger, alias: COMID )
• HWUniqID ( type: esriFieldTypeString, alias: Healthy Watersheds Unique ID, length: 8000 )
• HWFlag ( type: esriFieldTypeInteger, alias: Healthy Watersheds Flag )
• HWGroup ( type: esriFieldTypeString, alias: Healthy Watersheds Group, length: 8000 )
• State ( type: esriFieldTypeString, alias: State, length: 8000 )
• County ( type: esriFieldTypeString, alias: County, length: 8000 )
• PctNaturalLandWs ( type: esriFieldTypeDouble, alias: % Natural Land Cover (% Forest + % Wetland) )
• PctForestRZWs ( type: esriFieldTypeDouble, alias: % Forest Cover in the Riparian Zone )
• PopDensityWs ( type: esriFieldTypeDouble, alias: Mean Population Density in Watershed (people/sq. km) )
• HousingUnitDensWs ( type: esriFieldTypeDouble, alias: Housing Unit Density in Watershed (housing/sq. km) )
• MineDensityWs ( type: esriFieldTypeDouble, alias: Density of Mine Sites (mines/square mile) )
• AvgPctForestLossWs ( type: esriFieldTypeDouble, alias: % Forest Cover Loss Relative to Pre-development Forest Cover )
• MngdTurfHCZWs ( type: esriFieldTypeDouble, alias: % Managed Turf Grass )
• LandCondSubindex ( type: esriFieldTypeDouble, alias: Landscape Condition Sub-index )
• HUC12_ID ( type: esriFieldTypeString, alias: HUC12 ID, length: 12 )
• HUC12_Name ( type: esriFieldTypeString, alias: HUC12 Name, length: 80 )
• CatchmentArea_sqkm ( type: esriFieldTypeDouble, alias: Area (sq. km) )

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