AECOM 20250828 Version 2.8.5.6 FEMA-DCS-Hydraulics Washington, DC Federal Emergency Management Agency https://hazards.fema.gov Federal Emergency Management Agency Unknown Recent developments in digital terrain and geospatial database management technology make it possible to protect this investment for existing and future projects to a much greater extent than was possible in the past. The minimum requirement for hydraulics data includes input and output files for all hydraulic models and spatial datasets that are needed to implement the models. (Source: FEMA Guidelines and Standards for Flood Risk Analysis and Mapping.) Development of a hydraulic model to provide water-surface elevations for floodplain mapping requires significant investment in time and resources to obtain and process topographic survey data including cross-section and bridge surveys. 20250828 MIP Submission Date In work Unknown -101.259995 -100.265673 31.457180 30.837716 ISO 19115 Topic Category environment inlandWaters FEMA NFIP Topic Category Hydraulics Flood Insurance Rate Map FIRM Flood Hazard Data 0.2-Percent-Annual-Chance Flood 1-Percent-Annual-Chance Flood 2-Percent-Annual-Chance Flood 4-Percent-Annual-Chance Flood 10-Percent-Annual-Chance Flood 1-Percent-Plus-Annual-Chance Flood 1-Percent-Minus-Annual-Chance Flood Stream Lake Water Body Base Flood Elevation Cross Section Stream Centerline Profile Baseline Backwater BFE Flood Profile Floodway Floodway Data Table Bridge Culvert Dam Manning's Roughness Coefficient (Manning's n) None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Crockett COUNTY-FIPS 48105 COMMUNITY Crockett County, Unincorporated Areas FEMA-CID 480158 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Irion COUNTY-FIPS 48235 COMMUNITY Mertzon, City of FEMA-CID 480376 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Irion COUNTY-FIPS 48235 COMMUNITY Irion County, Unincorporated Areas FEMA-CID 481228 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Schleicher COUNTY-FIPS 48413 COMMUNITY Schleicher County, Unincorporated Areas FEMA-CID 480999 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Schleicher COUNTY-FIPS 48413 COMMUNITY El Dorado, City of FEMA-CID 481000 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Tom Green COUNTY-FIPS 48451 COMMUNITY Tom Green County, Unincorporated Areas FEMA-CID 480622 None REGION 06 STATE TX HUC8 SOUTH CONCHO HYDROLOGIC UNIT 12090102 COUNTY Tom Green COUNTY-FIPS 48451 COMMUNITY San Angelo, City of FEMA-CID 480623 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. Original data development environment may vary. Finishing of the data is done using Esri's ArcGIS software. The submitted geodatabase was created using ArcGIS version 10.5. The hydraulic modeling was performed using HEC-RAS. The FIRM Database consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. Attribute accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of the FIRM Database was also performed. Hydraulic analysis uses all valid existing flood elevation, survey, hydrologic analysis results, and other pertinent information for the study area. FEMA approved models are used to compute water surface elevations for required flood events. Computed water surface elevations and topographic data are used to delineate flood hazard boundaries. Roughness coefficients are carefully selected to represent the conditions along stream beds and banks. Hydraulics Data Capture submittals match the model output with respect to floodplain boundaries, cross sections, and water surface elevations and their precision. Floodplain boundaries and cross sections are not cartographically modified, and the data may not necessarily agree exactly with the published regulatory FIRM, FIRM Database, flood profiles, and Floodway Data Tables. Hydraulic analysis provides water surface elevations at different locations along the stream and for different flooding events. Hydraulic submittal includes key physical data used in the process, model parameters and model output. Data developed in surveying and hydrologic analysis are incorporated in hydraulic analysis. Results of hydraulic analysis are used to map Special Flood Hazard Area (SFHA) boundaries. Selection of model parameters (e.g., roughness coefficients, expansion and contraction coefficients, etc) is supported by additional information (e.g., landuse, aerial photo, etc). Model boundary conditions are carefully selected and justified. Modeled velocities are checked for potential erosion. The FIRM Database consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. Horizontal accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of the FIRM Database was also performed. The FIRM Database consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. Vertical accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of the FIRM database was also performed. AECOM 20250828 Digital 20250828 Publication Date STUDY1 Spatial and attribute information for S_Fld_Haz_Ar and S_Wtr_Ln. Hydraulic Study data development involves compiling survey and hydrologic analysis data, selecting an appropriate hydraulic model, preparing model input data, estimating model parameters, simulating water surface elevations for required recurrence intervals and delineating flood hazard boundaries. 20250828 0.017453292519943299 0.017453292519943299 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.0 298.26 North American Vertical Datum of 1988 0.0001 feet Attribute values S_Bfe Location and attributes for base flood elevation lines shown on the FIRM. 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_Fld_Haz_Ar A spatial data set consisting of polygons that represent the extent of the flood zones. FEMA FIRM Database Technical Reference (available at http://www.fema.gov/media-library/assets/documents/32363?id=7417 and on the FEMA Risk MAP Knowledge Sharing Site). S_Submittal_Info A spatial polygon data set to represent the extent of the project footprint. FEMA FIRM Database Technical Reference (available at http://www.fema.gov/media-library/assets/documents/32363?id=7417 and on the FEMA Risk MAP Knowledge Sharing Site). S_Wtr_Ln A spatial polyline data set to represent stream centerlines of the project footprint. 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). The Hydraulic submittal is made up of several data themes containing both spatial and attribute information. These data represent the extent of flooding and the water surface elevations for the subject area. The spatial data files and attribute tables include profile baselines, cross-sections, flood hazard boundaries, BFEs, manmade structures, and other data related to the NFIP. FEMA's FIRM Database Technical Reference contains a detailed description of each attribute code and a reference to other relevant information. FEMA, Mapping Information Platform mailing

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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-DCS-Hydraulics https://hazards.fema.gov Contact Distributor 20250828 MIPHelp Federal Emergency Management Agency mailing

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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 https://www.epsg.org FEMA NFIP Metadata Content and Format Standard