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Layer: TNC - Freshwater Resilience (ID:9)

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Name: TNC - Freshwater Resilience

Display Field: FWEcoName

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The scored unit polygons are a combination of HUC12 watersheds and Functionally Connected Network watersheds. The HUC12 watersheds were split by Functionally Connected Network (FCN) watershed boundaries if a FCN watershed dissected a HUC12 watershed (usually due to dams). A Hydrologic Unit Code (HUC) watershed represents the area of the landscape that drains to a portion of a stream network. Each hydrologic unit is identified by a unique hydrologic unit code (HUC) in the USGS Watershed Boundary Dataset consisting of digits based on the levels of classification in the hydrologic unit system https://water.usgs.gov/GIS/huc.html. The hydrologic units are arranged or nested within each other, from the largest geographic area (regions) to the smallest geographic area, the HUC12. Functionally Connected Networks (FCNs) are networks of rivers bounded by dams on rivers, the upper extent of the connected hydrology, or the confluence with an ocean or Great Lake. Within a given FCN, organisms have the ability to move and reach a variety of ecological settings. In this analysis, we mapped FCNs using the medium-resolution NHDPlus v2.1 hydrography and all dams located on rivers. For consistency,we defined rivers as flowlines with an upstream drainage area greater than 100 square kilometers (Wang et al. 2011). Dams on rivers (> 100 sq.km drainage area) were the focus of our connectivity modeling because inventories of smaller stream dams across CONUS are inconsistent and incomplete at present. In addition, dams on rivers have a more significant effect on overall connectivity patterns as rivers are the conduits that connect smaller streams. The land area draining directly to the connected set of rivers within each FCN was delineated using the 30-m DEM-derived “Flow Direction Grid” distributed with the medium-resolution NHDPlus v2.1. The Freshwater Resilience Score and the six key components of the freshwater resilience score are provided as attributes in this polygon dataset. All scores were transformed to standard normal distribution or z-scores which indicate how many standard deviations (SD) the score of an analysis unit is from the mean score of zero. For example, a unit with a z-score of 1 indicates that the value for this attribute is one standard deviation greater than the attribute mean of all units. Z- scores ranged from “3” (Far –Above Average) to “-3” (Far –Below Average), and we assigned z-scores to the following reporting classes:(x > 2,"Far Above Average", (x > 1 & x <= 2,"Above Average", (x > 0.5 & x <= 1,"Slightly Above Average", (x > -0.5 & x <= 0.5,"Average", (x > -1 & x <= -0.5,"Slightly Below Average",(x > -2 & x <= -1, "Below Average", (x <= -2, "Far Below Average"

Copyright Text: The Nature Conservancy, Center for Resilient Conservation Science. The Nature Conservancy created this dataset from analysis and integration of multiple publicly available source datasets.

Min. Scale: 0

Max. Scale: 0

Default Visibility: false

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Global ID Field:

Type ID Field: Resil_Cl

Fields:
Types:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 6/6/2025 6:46:47 PM

Schema Last Edit Date: 6/6/2025 6:46:47 PM

Data Last Edit Date: 6/6/2025 6:46:47 PM

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