Layer: HUC4_All_Attributes (ID: 0)

View In: ArcGIS Online Map Viewer

Name: HUC4_All_Attributes

Display Field: name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <p style="margin:12pt 0in 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;"><span style="font-size:12pt; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">There are several fields within this layer that have been calculated.  Below is an explanation detailing how the numbers are derived:<p style="margin:12pt 0in 0in 0.5in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">·<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">         Ocean to Headwater and Headwater to Ocean fields:<p style="margin:12pt 0in 12pt 1in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">    This layer was created though engineering assessment of the HUC 4 layer provided within the National Water Boundary Dataset. The hydraulic path from either downstream from the headwaters or upstream from ocean was counted to show precedence and priority based on longest flow paths.  Some assumptions were made for this effort:<ul> <ul> <ul> <li>Modeling would not occur on basins existing wholly outside of the continental US. For locations that contribute to flow into the US, an inflow assumption would be make at the boundary of the first HUC that contains portions of united states territory. Basins existing outside of the US would be removed from our lists/estimations.</li> <li>All HUCs with territory within the United States would be modeled using Riverine methods. The methodology for small Caribbean territories for example, or small islands within the Great Lakes will likely have a combination of inland and coastal flooding.</li> <li>Larger Bay features are considered the boundary for riverine features, and not dependent on downstream riverine routing, if the bay extends through multiple HUCs (Example: Chesapeake Bay)</li> <li>The lower Mississippi River HUCs, and other similar areas on the largest few drainages will likely need to be re-delineated for FFRD modeling purposes, as currently drainages are split in ways that will be complicated to model due to backwater impacts extending through multiple HUCs, and or Feedback loops from the largest of reservoirs. There would also concerns on fragility with Levees acting as boundaries of the HUCs. Therefore, these areas are subject to change as we move though the FFRD process.</li> <li>Continental United States (CONUS) basins will be prioritized until adequate data sources (i.e., terrain/gridded precipitation or precipitation alternative) is available for a given OCONUS HUC or HUC that covers territory within the United States as well as a neighboring country.</li> </ul> </ul> </ul><p style="margin:12pt 0in 0in 0.5in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">·<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">         DSAC and LSAC Risk:<p style="margin:12pt 0in 12pt 1in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o    These values were pulled from the <a href="https://nid.sec.usace.army.mil/#/">National Inventory of Dams</a> and the <a href="https://levees.sec.usace.army.mil/#/">National Levee Database</a>.  The values were then normalized by weighting the DSAC level and summing the total within a HUC 4 basin and combined into a third field for a combined risk.<p style="margin:12pt 0in 0in 0.5in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">·<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">         NRI Score, Social Vulnerability Score, &amp; Riverine Flooding Score:<p style="margin:12pt 0in 12pt 1in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o    These values were exported from <a href="https://www.fema.gov/flood-maps/products-tools/national-risk-index" target="_blank">FEMA National Risk Index</a> and then normalized by total square miles within a HUC 4 basin.<p style="margin:12pt 0in 0in 0.5in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">·<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">         HUC4<p style="margin:12pt 0in 12pt 0.75in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o   Downloaded from: <a href="https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/WBD/National/GDB/" target="_new">https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/WBD/National/GDB/</a><p style="margin:12pt 0in 12pt 0.75in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o   Source: <a href="https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/2" target="_new">https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/2</a><p style="margin:12pt 0in 12pt 1in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">o<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">    Description: HUC 4 polygons were extracted from the NHD dataset with the following description...<p style="margin:12pt 0in 12pt 1.5in; text-indent:-0.25in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">§<span style="font-variant-numeric:normal; font-variant-east-asian:normal; font-variant-alternates:normal; font-kerning:auto; font-feature-settings:normal; font-variant-position:normal; font-stretch:normal; font-size:7pt; font-family:&quot;Times New Roman&quot;;">  This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of HU boundaries from 2 to 14 digits compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agriculture (USDA) National Resources Conservation Service (NRCS) Watershed Boundary Dataset (WBD) sources. This data is intended primarily for geographic display and analysis of regional and national data and can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2,000,000).<p style="margin:12pt 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;"> <p style="margin:12pt 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">The data below originates from the FEMA Hazards website (<a href="https://hazards.fema.gov/nri/data-resources#gdbDownload" target="_new">FEMA Hazards NRI Data</a>) and was downloaded with information compiled at the Census Tract level.  Census tracts that cross HUC4 boundaries were added to the HUC4 basin that the majority of the Census Tract fell within.<p style="margin:12pt 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">NRI Data:<ul> <li>By Sq Miles:</li> <ul> <li>Name: Normalized_NRI_Score_Composite_by_Sq_Miles</li> <ul> <li>Multiply (National Risk Index - Value - Composite) by (Area (sq mi)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_NRI_Score_Composite_by_Sq_Miles</li> <ul> <li>Sorting the Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Sq_Miles layer from largest to smallest and ranking the values from 1 to 232.&gt;</li> </ul> </ul> </ul><ul> <li>By Population:</li> <ul> <li>Name: Normalized_National_Risk_Index_Score_Composite_by_Population</li> <ul> <li>Multiply (National Risk Index - Value - Composite) by (Population (2020)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_National_Risk_Index_Score_Composite_by_Population</li> <ul> <li>Sorting the Normalized_National_Risk_Index_Score_Composite_by_Population layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><ul> <li>By Structure:</li> <ul> <li>Name: Normalized_National_Risk_Index_Score_Composite_by_Structure</li> <ul> <li>Sum (National Risk Index - Value - Composite) by HUC4 Basin and sum the National Structure Inventory (NSI) by HUC4 basin. Multiply the two values together for each HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated. The NSI can be found here: <a href="https://nsi.sec.usace.army.mil/downloads/" target="_new">NSI Download Link</a>.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_National_Risk_Index_Score_Composite_by_Structure</li> <ul> <li>Sorting the Ranked_National_Risk_Index_Score_Composite_by_Structure layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><p style="margin:12pt 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">Social Vulnerability Data:<ul> <li>By Sq Miles:</li> <ul> <li>Name: Normalized_Social_Vulnerability_Score_by_Sq_Miles</li> <ul> <li>Multiply (Social Vulnerability - Score) by (Area (sq mi)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Social_Vulnerability_Score_by_Sq_Miles</li> <ul> <li>Sorting the Ranked_Social_Vulnerability_Score_by_Sq_Miles layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><ul> <li>By Population:</li> <ul> <li>Name: Normalized_Social_Vulnerability_Score_by_Population</li> <ul> <li>Multiply (Social Vulnerability - Score) by (Population (2020)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Social_Vulnerability_Score_by_Population</li> <ul> <li>Sorting the Ranked_Social_Vulnerability_Score_by_Population layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><ul> <li>By Structure:</li> <ul> <li>Name: Normalized_Social_Vulnerability_Score_by_Structure</li> <ul> <li>Sum (Social Vulnerability - Score) by HUC4 Basin and sum the National Structure Inventory (NSI) by HUC4 basin. Multiply the two values together for each HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated. The NSI can be found here: <a href="https://nsi.sec.usace.army.mil/downloads/" target="_new">NSI Download Link</a>.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Social_Vulnerability_Score_by_Structure</li> <ul> <li>Sorting the Ranked_Social_Vulnerability_Score_by_Structure layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><p style="margin:12pt 0in; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;">Riverine Flooding Data:<ul> <li>By Sq Miles:</li> <ul> <li>Name: Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Sq_Miles</li> <ul> <li>Multiply ((Riverine Flooding - Hazard Type Risk Index Score) by (Area (sq mi)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Sq_Miles</li> <ul> <li>Sorting the Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Sq_Miles layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul><ul> <li>By Population:</li> <ul> <li>Name: Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Population</li> <ul> <li>Multiply ((Riverine Flooding - Hazard Type Risk Index Score) by (Population (2020)) and sum the tracts by HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Population</li> <ul> <li>Sorting the Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Population layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul> <ul> <li>By Structure:</li> <ul> <li>Name: Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Structure</li> <ul> <li>Sum ((Riverine Flooding - Hazard Type Risk Index Score) by HUC4 Basin and sum the National Structure Inventory (NSI) by HUC4 basin. Multiply the two values together for each HUC4 basin. Normalize those values to be between 0 to 1 by dividing each result by the largest value calculated. The NSI can be found here: <a href="https://nsi.sec.usace.army.mil/downloads/" target="_new">NSI Download Link</a>.</li> </ul> </ul> <li>Ranked:</li> <ul> <li>Name: Ranked_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Structure</li> <ul> <li>Sorting the Normalized_Riverine_Flooding_Hazard_Type_Risk_Index_Score_by_Structure layer from largest to smallest and ranking the values from 1 to 232.</li> </ul> </ul> </ul>

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Fields:

objectid ( nullable: false, defaultValue: null, editable: false, length: 4, type: esriFieldTypeOID, modelName: objectid, alias: OBJECTID )
areaacres ( modelName: areaacres, nullable: true, editable: true, defaultValue: null, alias: Area (Ac), type: esriFieldTypeDouble )
areasqkm ( modelName: areasqkm, nullable: true, editable: true, defaultValue: null, alias: Area (SqKm), type: esriFieldTypeDouble )
states ( modelName: states, nullable: true, editable: true, defaultValue: null, length: 50, alias: States, type: esriFieldTypeString )
huc4 ( modelName: huc4, nullable: true, editable: true, defaultValue: null, length: 4, alias: HUC 4, type: esriFieldTypeString )
name ( modelName: name, nullable: true, editable: true, defaultValue: null, length: 120, alias: Name, type: esriFieldTypeString )
count_usgs_gages ( modelName: count_usgs_gages, nullable: true, editable: true, defaultValue: null, alias: USGS Gages, type: esriFieldTypeDouble )
count_nsi_total ( modelName: count_nsi_total, nullable: true, editable: true, defaultValue: null, alias: NSI Total, type: esriFieldTypeDouble )
count_nsi_industrial ( modelName: count_nsi_industrial, nullable: true, editable: true, defaultValue: null, alias: NSI Industrial, type: esriFieldTypeDouble )
count_nsi_residential ( modelName: count_nsi_residential, nullable: true, editable: true, defaultValue: null, alias: NSI Residential, type: esriFieldTypeDouble )
count_nsi_public ( modelName: count_nsi_public, nullable: true, editable: true, defaultValue: null, alias: NSI Public, type: esriFieldTypeDouble )
count_nsi_commercial ( modelName: count_nsi_commercial, nullable: true, editable: true, defaultValue: null, alias: NSI Commercial, type: esriFieldTypeDouble )
population ( modelName: population, nullable: true, editable: true, defaultValue: null, alias: Population, type: esriFieldTypeDouble )
basin_count_ocean_to_headwater ( modelName: basin_count_ocean_to_headwater, nullable: true, editable: true, defaultValue: null, length: 255, alias: Basin Count Ocean to Headwater, type: esriFieldTypeString )
basin_count_headwater_to__ocean ( modelName: basin_count_headwater_to__ocean, nullable: true, editable: true, defaultValue: null, length: 255, alias: Basin Count Headwater to Ocean, type: esriFieldTypeString )
normalized_nid_dsac_risk ( modelName: normalized_nid_dsac_risk, nullable: true, editable: true, defaultValue: null, alias: NID DSAC Risk, type: esriFieldTypeDouble )
normalized_nld_lsac_leveed_area ( modelName: normalized_nld_lsac_leveed_area, nullable: true, editable: true, defaultValue: null, alias: NLD LSAC Risk, type: esriFieldTypeDouble )
normalized_total_dsac_lsac_risk ( modelName: normalized_total_dsac_lsac_risk, nullable: true, editable: true, defaultValue: null, alias: Total DSAC LSAC Risk, type: esriFieldTypeDouble )
normalized_nri_score_composite ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeDouble, modelName: normalized_nri_score_composite, alias: NRI Score by Area )
normalized_social_vulnerability ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeDouble, modelName: normalized_social_vulnerability, alias: Social Vulnerability Score by Area )
normalized_riverine_flooding_ha ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeDouble, modelName: normalized_riverine_flooding_ha, alias: Riverine Flooding Score by Area )
nri_rank ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeSmallInteger, modelName: nri_rank, alias: NRI Rank by Area )
dsac_rank ( modelName: dsac_rank, nullable: true, editable: true, defaultValue: null, alias: DSAC Rank, type: esriFieldTypeSmallInteger )
lsac_rank ( modelName: lsac_rank, nullable: true, editable: true, defaultValue: null, alias: LSAC Rank, type: esriFieldTypeSmallInteger )
total_dsac_lsac_rank ( modelName: total_dsac_lsac_rank, nullable: true, editable: true, defaultValue: null, alias: Total DSAC LSAC Rank, type: esriFieldTypeSmallInteger )
social_vulnerability_rank ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeSmallInteger, modelName: social_vulnerability_rank, alias: Social Vulnerability Rank by Area )
riverine_flooding_rank ( nullable: true, editable: true, defaultValue: null, type: esriFieldTypeSmallInteger, modelName: riverine_flooding_rank, alias: Riverine Flooding Rank by Area )
SHAPE__Length ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Length, type: esriFieldTypeDouble )
SHAPE__Area ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Area, type: esriFieldTypeDouble )
productionyear ( nullable: true, editable: true, defaultValue: null, alias: Production Year, type: esriFieldTypeDouble )
nri_by_pop ( nullable: true, editable: true, defaultValue: null, alias: NRI Score by Population, type: esriFieldTypeDouble )
nri_rank_by_pop ( nullable: true, editable: true, defaultValue: null, alias: NRI Rank by Population, type: esriFieldTypeDouble )
social_vuln_score_by_pop ( nullable: true, editable: true, defaultValue: null, alias: Social Vulnerability Score by Population, type: esriFieldTypeDouble )
social_vuln_rank_by_pop ( nullable: true, editable: true, defaultValue: null, alias: Social Vulnerability Rank by Population, type: esriFieldTypeDouble )
riv_flood_score_by_pop ( nullable: true, editable: true, defaultValue: null, alias: Riverine Flooding Score by Population, type: esriFieldTypeDouble )
riv_flood_rank_by_pop ( nullable: true, editable: true, defaultValue: null, alias: Riverine Flooding Rank by Population, type: esriFieldTypeDouble )
nri_score_by_structures ( nullable: true, editable: true, defaultValue: null, alias: NRI Score by Structures, type: esriFieldTypeDouble )
nri_rank_by_structures ( nullable: true, editable: true, defaultValue: null, alias: NRI Rank by Structures, type: esriFieldTypeDouble )
social_vuln_score_by_struct ( nullable: true, editable: true, defaultValue: null, alias: Social Vulnerability Score by Structures, type: esriFieldTypeDouble )
social_vuln_rank_by_struct ( nullable: true, editable: true, defaultValue: null, alias: Social Vulnerability Rank by Structures, type: esriFieldTypeDouble )
riv_flood_score_by_structures ( nullable: true, editable: true, defaultValue: null, alias: Riverine Flooding Score by Structures, type: esriFieldTypeDouble )
riv_flood_rank_by_structures ( nullable: true, editable: true, defaultValue: null, alias: Riverine Flooding Rank by Structures, type: esriFieldTypeDouble )

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