20240206
09190000
1.0
FALSE
PHWA_100yr
0.000
2236806.864811
2418904.299840
6859488.547209
7087684.072899
1
002
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_Texas_North_Central_ftUS
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20240319
17170900
20240319
17170900
ISO 19139 Metadata Implementation Specification
Individual(s) who will be the primary point of contact for updating the data.
Department or Organization
Official title or position within the Department or Organization
Phone number of individual.
Email address of individual.
ArcGIS Metadata
1.0
PHWA_100yr
This layer is a subset of the floodplain_cfw_studies layer. As the City of Fort Worth (city) develops its urban flood risk identification tools, the city created Potential High-Water Areas (PHWA) across the entire City and ETJ areas for 1-, 5-, and 100-year storm events based on Atlas 14 precipitation data. These models were developed in HEC-RAS using a high-level Rain-on-Grid (ROG) analysis with the latest available 2019 LIDAR data and NOAA Atlas 14 rainfall data from the April 2020 iSWM manual to generate 1-, 5-, and 100-year outputs. The models were designed to account for the sub-surface storm drain network capacities using GIS asset information. Over 1,000 cross-drainage structures, not in the GIS asset information, were visually measured using EagleView software and incorporated into the models.This PHWA floodplain (shapefile) developed from this model was run through a GIS-based cleanup process to refine the boundary. These GIS steps aim to remove excessive noise, eliminate internal voids, evaluate isolated polygons, and smoothen the external polygon boundary to make the mapping output aesthetically pleasing and easier to use. The parameters used in the workflow process to perform the cleaning and smoothening steps were fine-tuned to work universally across all PHWA boundaries. Results were compared to the HEC-RAS ROG output data for general shape conformance and major approximations due to computer processing and the parameters were found to be universally acceptable for all PHWA areas across the city.
This layer represents the citywide boundary of the 100 year Potential High-Water Area (PHWA) studied by the Stormwater Division in 2022. This PHWA boundary is for informational purposes only. This PHWA boundary was revised by the city in 2022 using Atlas 14 precipitation. For questions, please contact Lisa Biggs, Floodplain Manager.
Consultant: Pape-Dawson.
Lisa Biggs
Stormwater
Floodplain Administrator
Phone number of individual.
Address
0
0
0
Lisa.Biggs@fortworthtexas.gov
Department use only. For questions, please contact Lisa Biggs, Floodplain Manager.
Use Limitation Notes: Any additional notes regarding use limitation |Data Update Method: How will this data be updated. (Directly edited by Department user, monthly load from outside source, script automantion, ect.) | Map Extent Notes: A description of the coverage area of this data.
Version 6.2 (Build 9200) ; Esri ArcGIS 10.9.1.28388
1
-97.629877
-97.029032
33.109444
32.476669
PHWA_100yr
Feature Class
137
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
FID_100YR_
FID_100YR_
Integer
4
10
0
Crk_Nm
Crk_Nm
String
50
0
0
RAS_Geom
RAS_Geom
String
50
0
0
Pol_Ar
Pol_Ar
String
50
0
0
Shape
Shape
Geometry
4
0
0
Feature geometry.
Esri
Coordinates defining the features.
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
Feature Class
dataset
137
Simple
FALSE
137
TRUE
FALSE
20240319