20260410
15024500
1.0
FALSE
TWDB_BFE_FloodArea
002
-99.757568
-93.688070
27.209370
33.959530
1
Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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20260420
08245900
20260420
08245900
50000
5000
ItemDescription
dataset
20260420
Enterprise Geodatabase Feature Class
Esri ArcGIS 13.5.3.57366
TWDB_BFE_FloodArea
Estimated Base Level Elevation (BLE) data, specifically the flood area dataset which includes Floodway, 1% and 0.2% annual flood areas for the state of Texas. This is a consolidated dataset of approximately 200 watersheds in the Texas region. Data was downloaded from the USGS/FEMA BLE Viewer (https://webapps.usgs.gov/infrm/estbfe/), unzipped, the Flood Areas for each watershed were merged together then a Delete Identical was ran, as well as Projection to NAD 83. This dataset is clipped to Pape-Dawson's Web Map Regions layer and includes an attribute for the web map region for filtering. A full dataset can be referenced here: TWDB_StatewideBLE.gdb
For questions on processing, please contact Sara Dunlap (SDunlap@pape-dawson.com).
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Flood Risk Information Report produced by the Estimated Base Flood Elevation (estBFE) Viewer includes estimated Base Flood Elevation (BFE) and approximate flood depths determined from gridded datasets constructed from engineering flood models. It also includes area downloads for HEC-RAS (Hydrologic Engineering Center’s River Analysis System) modeling. HEC-RAS software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling. (More information)</SPAN></P><P><SPAN>For downloadable layers: At the link above, select Map Layers, then Data Availability (BLE), select “On” for status & data download. Click an area on the map to view downloadable datasets.</SPAN></P><P><SPAN>Statewide BLE data is expected to be available on the BLE website for download by summer 2025. To see the current progress of BLE development throughout the state and the status for a given watershed, please see the BLE Status Dashboard here: BLE Status Dashboard (arcgis.com). For BLE data inquiries, please contact BLE@twdb.texas.gov.</SPAN></P></DIV></DIV></DIV>
TWDB, FEMA, USGS, 2026
FEMA
USGS
TWDB
BFE
BLE
Flood Area
Flood Risk
Environmental
1
-99.757568
-93.688070
33.959530
27.209370
0
EPSG
6.5(3.0.1)
TWDB_BFE_FloodArea
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
SHAPE
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
EST_ID
EST_ID
String
20
0
0
VERSION_ID
VERSION_ID
String
11
0
0
EST_AR_ID
EST_AR_ID
String
25
0
0
ZONE_SUBTY
ZONE_SUBTY
String
72
0
0
V_DATUM
V_DATUM
String
17
0
0
LEN_UNIT
LEN_UNIT
String
16
0
0
SOURCE_CIT
SOURCE_CIT
String
15
0
0
EST_Risk
EST_Risk
String
30
0
0
STUDY_TYP
STUDY_TYP
String
28
0
0
SFHA_TF
SFHA_TF
String
1
0
0
STATIC_BFE
STATIC_BFE
Double
8
38
8
DEPTH
DEPTH
Double
8
38
8
VELOCITY
VELOCITY
Double
8
38
8
VEL_UNIT
VEL_UNIT
String
20
0
0
AR_REVERT
AR_REVERT
String
17
0
0
AR_SUBTRV
AR_SUBTRV
String
72
0
0
BFE_REVERT
BFE_REVERT
Double
8
38
8
DEP_REVERT
DEP_REVERT
Double
8
38
8
DUAL_ZONE
DUAL_ZONE
String
1
0
0
FLD_ZONE
FLD_ZONE
String
17
0
0
GlobalID
GlobalID
GlobalID
38
0
0
MERGE_SRC
MERGE_SRC
String
255
0
0
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
Simple
FALSE
0
TRUE
FALSE