Name: SB3 Flash Flood Risk Areas - Hazard Inputs

Display Field: FFRA_Grid

Type: Table

Geometry Type: N/A

Description: FFRA_Grid: This is a foreign key that relates to the Unique_ID field in the FFRA_Grid table. Distance_to_Drainage: Represents proximity to streams or rivers, normalized between 0 and 1, where a value of 1 represents the highest distance to drainage within the study area. A lower normalized distance-to-drainage value indicates closer proximity to a channel and higher flood potential.Slope: Controls runoff velocity and flow direction and a strong predictor of flash flood intensity in steep basins, normalized between 0 and 1, where a value of 1 represents the highest slope within the study area. A higher (steeper) normalized slope value indicates higher flash flood potential.Flashiness: Represents the flashy nature of landscape, normalized between 0 and 1, where a value of 1 represents the highest flashiness index within the study area. A higher flashiness index indicates higher flashiness potential.Hand: Represents local hydraulic position relative to drainage network, normalized between 0 and 1, where a value of 1 represents the highest HAND within the study area. A lower normalized HAND value indicates higher flood potential.Drainage_Density: Represents the local concentration of stream channels per unit area, normalized between 0 and 1, where a value of 1 represents the highest drainage density within the study area. A higher normalized drainage density value indicates higher flashiness potential.Rainfall: Represents 100-yr, 24-hr precipitation depths, normalized between 0 and 1, where a value of 1 represents the highest precipitation depth within the study area. A higher normalized rainfall value indicates higher flash flood potential.Flow Accumulation: Identifies concentrated flow paths and potential channel initiation zones, normalized between 0 and 1, where a value of 1 represents the highest flow accumulation within the study area. A higher normalized flow accumulation value indicates higher flood potential.Plan Curvature: Represents flow convergence and divergence zones by computing curvature perpendicular to slope direction, normalized between 0 and 1, where a value of 1 represents the highest plan curvature within the study area. A lower normalized plan curvature value indicates higher flood potential.TWI: Identifies runoff concentration/saturation zones, normalized between 0 and 1, where a value of 1 represents the highest TWI within the study area. A higher normalized TWI value indicates higher flood potential.Curve_Number: Represents spatial runoff potential, normalized between 0 and 1, where a value of 1 represents the highest curve number within the study area. A higher normalized curve number value indicates higher flash flood potential.TPI: Distinguishes ridge/valley and channel confinement and helps locate flash-flood routing corridors, normalized between 0 and 1, where a value of 1 represents the highest TPI within the study area. A lower normalized TPI value indicates higher flood potential.Profile Curvature: Controls flow acceleration, erosion, and deposition potential by computing curvature along direction of maximum slope, normalized between 0 and 1, where a value of 1 represents the highest profile curvature within the study area. A lower normalized profile curvature value indicates higher flashiness potential.SPI: Indicates erosive energy and peak flow hazard, normalized between 0 and 1, where a value of 1 represents the highest SPI within the study area. A higher normalized SPI value indicates higher flashiness potential.

Service Item Id: 529a2117509d4bf5aa90881ea30d97fa

Copyright Text: This data was generated by WERC, using the United States Geological Survey (USGS) LiDAR 30-meter Digital Elevation Model (DEM), USGS National Land Cover Dataset (NLCD) Land Use / Land Cover (LULC), National Oceanic and Atmospheric Administration (NOAA) Atlas 14 100-year, 24-hour Gridded Precipitation Dataset, and the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Gridded Soil Survey Geographic (gSSURGO) database.

Default Visibility: false

Max Result Window: N/A

Max Record Count: 86516

Standard Max Record Count No Geometry: N/A

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Tile Max Record Count: 86516

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Supported Query Formats: JSON, PBF

Supports Advanced Queries: true

Supports Statistics: true

Use Standardized Queries: true

Extent:

Drawing Info:

N/A

Feature Draw Order:

N/A

Advanced Query Capabilities:

Supports Statistics: true
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Supports Query With Distance: true
Supports Sql Expression: true
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Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
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HasZ: false

HasM: false

Has Attachments: false

Has Last Edit Time: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Type ID Field: N/A

Fields:

• OBJECTID ( nullable: false, alias: OBJECTID, type: esriFieldTypeOID )
• FFRA_Grid ( nullable: true, length: 100, alias: FFRA_Grid, type: esriFieldTypeString )
• Distance_to_Drainage ( nullable: true, alias: Distance_to_Drainage, type: esriFieldTypeDouble )
• Slope ( nullable: true, alias: Slope, type: esriFieldTypeDouble )
• Flashiness ( nullable: true, alias: Flashiness, type: esriFieldTypeDouble )
• Hand ( nullable: true, alias: Hand, type: esriFieldTypeDouble )
• Drainage_Density ( nullable: true, alias: Drainage_Density, type: esriFieldTypeDouble )
• Rainfall ( nullable: true, alias: Rainfall, type: esriFieldTypeDouble )
• Flow_Accumulation ( nullable: true, alias: Flow_Accumulation, type: esriFieldTypeDouble )
• Plan_Curvature ( nullable: true, alias: Plan_Curvature, type: esriFieldTypeDouble )
• TWI ( nullable: true, alias: TWI, type: esriFieldTypeDouble )
• Curve_Number ( nullable: true, alias: Curve_Number, type: esriFieldTypeDouble )
• TPI ( nullable: true, alias: TPI, type: esriFieldTypeDouble )
• Profile_Curvature ( nullable: true, alias: Profile_Curvature, type: esriFieldTypeDouble )
• SPI ( nullable: true, alias: SPI, type: esriFieldTypeDouble )

Relationships:

• FFRA_Grid (5) -- Related To: Flash Flood Hazard Analysis Grid (1 Kilometer) (0)
• FFRA_500_Year (18) -- Related To: Provisional Flash Flood Hazard Areas (TWDB 2024 Flood Quilt) (1)

Supported Operations:   Query   Query Attachments   Query Analytic   Query Related Records   Generate Renderer   Return Updates

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