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Floodplain_Effective_Detailed_100
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Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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ItemDescription
Esri ArcGIS 13.3.0.52636
NFHL Effective Detailed 1%
Effective Detailed floodplain for the state of Texas.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Effective Detailed 1% annual chance flood event floodplain for the state of Texas.</SPAN></P><P><SPAN>This data has flood hazard information that includes detailed studies (Flood Zones AE, AO, AH, VE, and Open Water and excluding shaded and unshaded X) and is the current Effective FIRM. This layer includes LOMR information that was effective when TWDB downloaded the data from FEMA (as reflected in the metadata). Up to date effective FEMA floodplain and LOMR information can be viewed through FEMA’s NFHL Viewer separately. Preliminary data is in the appeal and protest and could potentially change but is still newer information than the effective maps. </SPAN></P><P><SPAN>The NFHL effective data included in the Flood Quilt was obtained in March of 2024 from the </SPAN><A href="https://hazards.fema.gov/arcgis/rest/services/public/NFHL/MapServer" target="_blank" STYLE="text-decoration:underline;"><SPAN>NFHL Rest Service</SPAN></A><SPAN>.</SPAN></P></DIV></DIV></DIV>
FEMA
1% annual chance
100 year flood
flood quilt
floodplain
flood frequencies
Texas
Texas State Flood Plan
flood data
flood planning
NFHL
FEMA
National Flood Hazard Layer Availability
detailed flood study areas
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>TWDB acknowledges there will be difficult choices between older, detailed data and newer, approximate data. TWDB is offering a high-level statewide opinion on ranks, but will encourage users to investigate those difficult choices at the regional or local level and adjust as needed, which may include piecemeal approaches where only portions of data sets are ranked above others. </SPAN></P><P><SPAN>The TWDB is not anticipating developing any hierarchy to support, for example, regulatory activities and does not, at this time, recommend use of this broadly ranked quilt dataset for regulatory activities. </SPAN></P></DIV></DIV></DIV>
Enterprise Geodatabase Feature Class
dataset
EPSG
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0
Simple
FALSE
0
TRUE
FALSE
Floodplain_Effective_Detailed_100
Feature Class
0
OBJECTID
OBJECTID
OID
4
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Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
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0
0
Feature geometry.
Esri
Coordinates defining the features.
DFIRM_ID
DFIRM_ID
String
6
0
0
STUDY_TYP
STUDY_TYP
String
38
0
0
FLD_ZONE
FLD_ZONE
String
17
0
0
ZONE_SUBTY
ZONE_SUBTY
String
76
0
0
SOURCE
SOURCE
String
255
0
0
Shape.STArea()
Shape.STArea()
Double
0
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Shape.STLength()
Shape.STLength()
Double
0
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20260126