20260323
11585300
1.0
FALSE
FFRA_Grid
002
-104.639785
-96.309785
27.291276
32.541276
1
-
-
-
-
-
-
-
-
-
-
-
-
Geographic
GCS_WGS_1984
Angular Unit: Degree (0.017453)
<GeographicCoordinateSystem xsi:type='typens:GeographicCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.3.0'><WKT>GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG",4326]]</WKT><XOrigin>-400</XOrigin><YOrigin>-400</YOrigin><XYScale>11258999068426.238</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>8.983152841195215e-09</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><LeftLongitude>-180</LeftLongitude><WKID>4326</WKID><LatestWKID>4326</LatestWKID></GeographicCoordinateSystem>
20260223
15552300
20260223
15552300
150000000
5000
dataset
20260223
File Geodatabase Feature Class
Esri ArcGIS 13.3.0.52636
Flash Flood Hazard Analysis Grid (1 Kilometer)
The FFRA_Grid feature class represents 1-Square Kilometer tiles across the study area.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Unique ID</SPAN><SPAN STYLE="font-size:12pt">: This unique identifier is the primary key and it is used to relate to the other tables within this relational database.</SPAN></P><P><SPAN STYLE="font-size:12pt">Any other fields have been joined from the following tables for labeling purposes: FFRA_Haz and Buildings_Pop_500yr</SPAN></P></DIV></DIV></DIV>
This data was generated by WERC.
county
FFRA
Flash Flood
Flash Flood Risk Areas
Flood Quilt
Flood
floodplain
risk
hazard
index
grid
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The FFRA was developed for a 30-county area at 1×1 km resolution to balance computational efficiency and clarity of intent; designed to identify areas warranting outdoor warning sirens, not to site sirens directly.</SPAN></P><P><SPAN>The FFRA is provided for the 30-county area at a spatial resolution of 1-kilometer by 1-kilometer for better computational efficiency as well as to align with input data with the coarsest resolution among those that were used in this study. In addition, the selection of the 1-kilometer by 1-kilometer grid for processing FFRA can avoid confusion about the intent of the product – a finer resolution may give a false impression about the precision or intent of this study. This study is not intended to site sirens as part of outdoor warning siren systems but to identify flash flood-prone areas that warrant sirens. FFRA with a resolution of 1x1 kilometer can adequately serve as foundational information for identifying flash flood-prone areas that warrant sirens given the audible radius for outdoor warning sirens typically ranging from approximately 1 to 2 miles.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
1
-104.639785
-96.309785
32.541276
27.291276
83551
EPSG
6.2(3.0.1)
FFRA_Grid
Feature Class
83551
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
Unique_ID
Unique_ID
String
100
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
Hazard_Index
Hazard_Index
Single
4
0
0
Has_Buildings_500_year
Has_Buildings_500_year
String
1
0
0
Agriculture_Count_500_year
Agriculture_Count_500_year
Integer
4
0
0
Agriculture_Population_500_year
Agriculture_Population_500_year
Double
8
0
0
Commercial_Count_500_year
Commercial_Count_500_year
Integer
4
0
0
Commercial_Population_500_year
Commercial_Population_500_year
Double
8
0
0
Industrial_Count_500_year
Industrial_Count_500_year
Integer
4
0
0
Industrial_Population_500_year
Industrial_Population_500_year
Double
8
0
0
Public_Count_500_year
Public_Count_500_year
Integer
4
0
0
Public_Population_500_Year
Public_Population_500_year
Double
8
0
0
Residential_Count_500_year
Residential_Count_500_year
Integer
4
0
0
Residential_Population_500_year
Residential_Population_500_year
Double
8
0
0
Vacant_Count_500_year
Vacant_Count_500_year
Integer
4
0
0
Vacant_Population_500_year
Vacant_Population_500_year
Double
8
0
0
Building_Count_500_year
Building_Count_500_year
Integer
4
0
0
Population_Total_500_year
Population_Total_500_year
Integer
4
0
0
Simple
FALSE
83551
TRUE
FALSE