Texas Water Development Board (TWDB) 20230531 Version 2.6.5.6 FEMA-DCS-Terrain Washington, DC Federal Emergency Management Agency https://hazards.fema.gov Federal Emergency Management Agency 20240607 Elevation data, as defined in FEMA's Guidelines and Standards for Flood Risk Analysis and Mapping, describe the digital topographic data that were used to create the data representing the terrain environment of a watershed and/or floodplain. Elevation data requirements allow for flexibility in the types of information used to produce final levation deliverables. Submission of the terrain data sources allows FEMA to account for the origins of the flood study terrain data. (Source: FEMA Guidelines and Standards for Flood Risk Analysis and Mapping.) Elevation data are used to represent the topography of a watershed and/or floodplain environment and to extract useful information for hydraulic and hydrologic models. (Source: FEMA Guidelines and Standards for Flood Risk Analysis and Mapping) 20240607 MIP Submission Date In work Unknown -98.0 -96.8 33.1 32.3 ISO 19115 Topic Category elevation FEMA NFIP Topic Category Land Surface Relief Topography Digital Elevation Model Elevation Data Slope LiDAR Breaklines Contours DEM Flow Vectors Bare Earth TIN Triangulated Irregular Network Hydro Enforced DEM None REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY CITY OF IRVING FEMA-CID 480180 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY CITY OF DALLAS FEMA-CID 480171 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY CITY OF CEDAR HILL FEMA-CID 480168 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY CITY OF DUNCANVILLE FEMA-CID 480173 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY CITY OF GRAND PRAIRIE FEMA-CID 485472 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY DALLAS COUNTY-FIPS 113 COMMUNITY DALLAS COUNTY UNINCORPORATED AREAS FEMA-CID 480165 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY ELLIS COUNTY-FIPS 139 COMMUNITY CITY OF MIDLOTHIAN FEMA-CID 480801 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY ELLIS COUNTY-FIPS 139 COMMUNITY ELLIS COUNTY UNINCORPORATED AREAS FEMA-CID 480798 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY HOOD COUNTY-FIPS 221 COMMUNITY CITY OF CRESSON FEMA-CID 480177 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY HOOD COUNTY-FIPS 221 COMMUNITY HOOD COUNTY UNINCORPORATED AREAS FEMA-CID 480356 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY CITY OF JOSHUA FEMA-CID 480882 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY CITY OF ALVARADO FEMA-CID 480397 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY CITY OF BRIAROAKS FEMA-CID 480398 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY CITY OF BURLESON FEMA-CID 485459 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY CITY OF CROSS TIMBER FEMA-CID 481685 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY TOWN OF VENUS FEMA-CID 480883 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY JOHNSON COUNTY-FIPS 251 COMMUNITY JOHNSON COUNTY UNINCORPORATED AREAS FEMA-CID 480879 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY CITY OF ALEDO FEMA-CID 481659 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY TOWN OF ANNETTA FEMA-CID 481660 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY TOWN OF ANNETTA NORTH FEMA-CID 481664 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY TOWN OF ANNETTA SOUTH FEMA-CID 481665 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY CITY OF HUDSON OAKS FEMA-CID 480147 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY CITY OF WEATHERFORD FEMA-CID 480522 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY CITY OF WILLOW PARK FEMA-CID 481164 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY PARKER COUNTY-FIPS 367 COMMUNITY PARKER COUNTY UNINCORPORATED AREAS FEMA-CID 480520 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF HALTOM CITY FEMA-CID 480599 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF HASLET FEMA-CID 480600 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY TOWN OF DALWORTHINGTON GARDENS FEMA-CID 481013 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF KELLER FEMA-CID 480602 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF SAGINAW FEMA-CID 480610 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF SOUTHLAKE FEMA-CID 480612 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF ARLINGTON FEMA-CID 485454 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF AZLE FEMA-CID 480584 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF BEDFORD FEMA-CID 480585 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF BENBROOK FEMA-CID 480586 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF BLUE MOUND FEMA-CID 480587 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF COLLEYVILLE FEMA-CID 480590 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF CROWLEY FEMA-CID 480591 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY TOWN OF EDGECLIFF VILLAGE FEMA-CID 480592 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF EULESS FEMA-CID 480593 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF EVERMAN FEMA-CID 480594 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF FOREST HILL FEMA-CID 480595 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF FORT WORTH FEMA-CID 480596 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF GRAPEVINE FEMA-CID 480598 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF HURST FEMA-CID 480601 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF KENNEDALE FEMA-CID 480603 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF LAKESIDE FEMA-CID 480604 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF LAKE WORTH FEMA-CID 480605 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF MANSFIELD FEMA-CID 480606 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF NORTH RICHLAND HILLS FEMA-CID 480607 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY TOWN OF PANTEGO FEMA-CID 481116 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF RICHLAND HILLS FEMA-CID 480608 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF RIVER OAKS FEMA-CID 480609 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF SANSOM PARK FEMA-CID 480611 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF WATAUGA FEMA-CID 480613 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY TOWN OF WESTOVER HILLS FEMA-CID 480615 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF WESTWORTH VILLAGE FEMA-CID 480616 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY CITY OF WHITE SETTLEMENT FEMA-CID 480617 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY TARRANT COUNTY-FIPS 439 COMMUNITY TARRANT COUNTY UNINCORPORATED AREAS FEMA-CID 480582 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 REGION 06 STATE TX COUNTY WISE COUNTY-FIPS 497 COMMUNITY WISE COUNTY UNINCORPORATED AREAS FEMA-CID 481051 HUC8 Lower West Fork Trinity HYDROLOGIC UNIT 12030102 None Acknowledgement of FEMA would be appreciated in products derived from these data. These digital data are produced for the purposes of updating/creating a FIRM Database and/or Flood Risk Products. Federal Emergency Management Agency mailing

500 C Street, S.W.

Washington District of Columbia 20472 USA 1-877-336-2627 fema-riskmap-ithelp@fema.dhs.gov Original data development environment may vary. Derivative product generation is done using Esri's ArcGIS software. Ground classification routines are used to remove any non-ground points and generate an accurate ground surface. The ground routine consists of three main parameters (building size, iteration angle, and iteration distance); by adjusting these parameters and running several iterations of this routine an initial ground surface is developed. The building size parameter sets a roaming window size. Each tile is loaded with neighboring points from adjacent tiles and the routine classifies the data section by section based on this roaming window size. The second most important parameter is the maximum terrain angle, which sets the highest allowed terrain angle within the model. Once the ground routine has been completed a manual quality control routine is done using hillshades, cross-sections, and profiles. After this QC step, a peer review and supervisor manual inspection is completed on a percentage of the classified tiles based on the project size and variability of the terrain. After the ground classification corrections are completed, the dataset is processed through a water classification routine that utilizes breaklines to automatically classify hydrographic features. The water classification routine selects ground points within the breakline polygons and automatically classifies them as class 9, water. During this water classification routine, points which are in close proximity (1 m) to the hydrographic features are moved to class 10, ignored ground. In addition to classes 1, 2, 8, 9, and 10, the project allows for a Class 7, noise points. This class is only used if needed when points can manually be identified as low/high points. The fully classified dataset is then processed through a comprehensive quality control program. The data are classified as follows: Class 1 = Unclassified. This class includes vegetation, buildings, noise etc. Class 2 = Ground Class 7 = Noise Class 8 = Model Key Points Class 9 = Water Class 10 = Ignored Ground Class 11 = Withheld The LAS header information was verified to contain the following: Class (Integer) GPS Week Time (0.0001 seconds) Easting (0.01 m) Northing (0.01 m) Elevation (0.01 m) Echo Number (Integer 1 to 4) Echo (Integer 1 to 4) Intensity (8 bit integer) Flight Line (Integer) Scan Angle (Integer degree) Checks were performed to ensure the data files can be opened, are georeferenced properly, and cover the geographic area completely. Additionally, field survey checkpoints are obtained to evaluate the accuracy of LiDAR products. A minimum of 100 checkpoints are tested in a project area. At least 20 for 5 different land vegetation categories (forest, built-up, scrub, weeds/crop, and bare-earth/low grass) are tested with forested areas requiring a minimum of 40 checkpoints. A statistical analysis between the difference in elevations of the field survey checkpoints and LiDAR-derived, bare earth elevations at the same locations provides a quality assessment of the LiDAR data. The bare earth surface data is an estimation of the bare earth surface and does not include vegetative and built features. Likewise, it contains estimates of water edges at the time of data collection, and may not reflect current conditions. The bare earth surface will contain voids where insufficient energy was reflected from the surface to generate a valid return from the terrain. Voids in the bare earth surface tend to occur in heavily vegetated areas, water bodies, and beneath buildings, motor vehicles, bridges etc. Fresh or wet asphalt, wet sand and certain types of vegetation can also cause voids or anomalous elevations. The data may have been further processed to remove points found to be within delineated water bodies. Low confidence areas are delineated and provided in a separate dataset. The LiDAR data horizontal accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA Guidelines and Standards for Flood Risk Analysis and Mapping. NSSDA 0.07 Vertical accuracy assessment was computed at 28.6 cm according to ASPRS and NSSDA specifications. Texas Geographic Information Office 20130301 Online 20130301 Publication Date TOPO1 Spatial and attribute information for Terrain Submittal United States Geological Survey 20150112 Online 20150112 Publication Date TOPO2 Spatial and attribute information for Terrain Submittal United States Geologic Survey 20160321 Online 20160321 Publication Date TOPO3 Spatial and attribute information for Terrain Submittal Federal Emergency Management Agency 20180527 Online 20180527 Publication Date TOPO4 Spatial and attribute information for Terrain Submittal United States Geological Survey 20190712 Online 20190712 Publication Date TOPO5 Spatial and attribute information for Terrain Submittal Texas Geographic Information Office 20200424 Online 20200424 Publication Date TOPO6 Spatial and attribute information for Terrain Submittal Elevation data used for flood risk analysis go through LiDAR preliminary processing and the unclassified point cloud data are tested as specified in the USGS National Geospatial Program Base LiDAR Specification Version 1.2 and the ASPRS Positional Accuracy Standards for Digital Geospatial Data. Where the Mapping Activity Statement (MAS) requires bare earth post-processing of the floodplain area of interest (AOI), the elevation data are tested and comply with both the Non-vegetated Vertical Accuracy (NVA) and Vegetated Vertical Accuracy (VVA) requirements. Where no bare earth post-processing is specified, only the NVA requirements apply for LiDAR preliminary processing. 20240607 State Plane Coordinate System 1983 4202 32.13333333333333 33.96666666666667 -98.5 31.66666666666667 1968500.0 6561666.666666666 coordinate pair 0.304800609601219 0.304800609601219 feet North American Datum of 1983 (2011) Geodetic Reference System 80 6378137 298.25 North American Vertical Datum of 1988 (Geoid 12B) 0.0001 Survey Feet Attribute values S_Submittal_Info A spatial dataset consisting of polygons depicting the extents of the studied area. FEMA FIRM Database Technical Reference (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site). S_Topo_Confidence A spatial dataset consisting of polygons depicting areas of low confidence topographic data. FEMA FIRM Database Technical Reference (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site). Bare Earth DEM An elevation model where bare-earth elevation values have regularly spaced intervals in latitude and longitude (x and y). FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site) Classified Point Cloud Data The final processing and classification of LiDAR data to the required ASPRS LAS classes, per project specifications. This includes testing for Non-vegetated Vertical Accuracy (NVA). FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site) Breakline A linear feature demarking a change in the smoothness or continuity of a surface such as abrupt elevation changes or a stream line. FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site) HDEM Hydrologically corrected DEMs FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site) Tiling Index A spatial dataset that describes the tiling system used for multiple files of the same type. FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping and on the FEMA Risk MAP Knowledge Sharing Site) The elevation data package is made up of several data themes containing primarily spatial information. These data supplement the elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations. FEMA's Guidelines and Standards for Flood Risk Analysis and Mapping contains a detailed description of the data themes and references to other relevant information. FEMA, Mapping Information Platform mailing

500 C Street, S.W.

Washington District of Columbia 20472 USA 1-877-336-2627 fema-riskmap-ithelp@fema.dhs.gov No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. FEMA-Terrain-Capture https://hazards.fema.gov Contact Distributor 20240607 MIPHelp Federal Emergency Management Agency mailing

500 C Street, S.W.

Washington District of Columbia 20472 USA 1-877-336-2627 fema-riskmap-ithelp@fema.dhs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 https://hazards.fema.gov http://www.epsg.org FEMA NFIP Metadata Content and Format Standard