Texas Water Development Board (TWDB) CTP FY2020 Risk MAP Project 202200522 Version 2.5.3.6 FEMA-DCS-Hydraulics Austin, TX Federal Emergency Management Agency https://hazards.fema.gov Federal Emergency Management Agency 20220521 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. 20220521 MIP Submission Date In work Unknown -97.30 -96.82 28.60 27.82 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 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 ARANSAS BAY HYDROLOGIC UNIT 12100405 COUNTY ARANSAS COUNTY CALHOUN COUNTY GOLIAD COUNTY NUECES COUNTY REFUGIO COUNTY SAN PATRICIO COUNTY-FIPS 007 COUNTY-FIPS 057 COUNTY-FIPS 409 COUNTY-FIPS 355 COUNTY-FIPS 391 COUNTY-FIPS 409 COMMUNITY CITY OF AGUA DULCE COMMUNITY CITY OF ARANSAS PASS COMMUNITY CITY OF AUSTWELL COMMUNITY CITY OF BAYSIDE COMMUNITY CITY OF BISHOP COMMUNITY CITY OF CORPUS CHRISTI COMMUNITY CITY OF DRISCOLL COMMUNITY CITY OF FULTON COMMUNITY CITY OF GOLIAD COMMUNITY CITY OF GREGORY COMMUNITY CITY OF INGLESIDE COMMUNITY CITY OF INGLESIDE ON THE BAY COMMUNITY CITY OF LAKE CITY COMMUNITY CITY OF MATHIS COMMUNITY CITY OF ODEM COMMUNITY CITY OF PETRONILA COMMUNITY CITY OF POINT COMFORT COMMUNITY CITY OF PORT ARANSAS COMMUNITY CITY OF PORT LAVACA COMMUNITY CITY OF PORTLAND COMMUNITY CITY OF REFUGIO COMMUNITY CITY OF ROCKPORT COMMUNITY CITY OF SAN PATRICIO COMMUNITY CITY OF SEADRIFT COMMUNITY CITY OF SINTON COMMUNITY CITY OF TAFT COMMUNITY CITY OF WOODSBORO FEMA-CID 480504 FEMA-CID 485453 FEMA-CID 481086 FEMA-CID 481586 FEMA-CID 480505 FEMA-CID 485464 FEMA-CID 485464 FEMA-CID 480507 FEMA-CID 480012 FEMA-CID 480828 FEMA-CID 480555 FEMA-CID 485480 FEMA-CID 481645 FEMA-CID 480175 FEMA-CID 480210 FEMA-CID 480557 FEMA-CID 480558 FEMA-CID 480560 FEMA-CID 480098 FEMA-CID 485498 FEMA-CID 480099 FEMA-CID 480559 FEMA-CID 480540 FEMA-CID 485503 FEMA-CID 485504 FEMA-CID 481556 FEMA-CID 480100 FEMA-CID 485511 FEMA-CID 481506 FEMA-CID 480987 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 10.3. 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. TWBD 20220521 Digital 20220521 Publication date STUDY1 Spatial and attribute information for floodplains, xs, subbasins, and waterlines. 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. 20220521 State Plane Coordinate System 1983 4203 30.11666666666667 31.88333333333333 -100.3333333333333 29.66666666666667 2296583.333333333 9842500.0 coordinate pair 0.304800609601219 0.304800609601219 foot_us North American Datum of 1983 Geodetic Reference System 80 6378137 298.25 North American Vertical Datum of 1988 0.03 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 Location and attributes for flood risk zones 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_Gen_Struct A spatial dataset consisting of lines that depict the location of flood control structures shown on the flood profile and 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_HWM A spatial dataset depicting the locations of high water marks from historic flooding used for model calibration. 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_Levee A spatial dataset consisting of lines that represent the centerlines of levees. 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_Profil_BasLn A spatial dataset consisting of lines showing the flow path used for floodplain modeling and mapping. 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_Riv_Mrk Location and attributes for river mile markers 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_Stn_Start A spatial dataset consisting of points indicating the location of the reference point that was used as the origin for distance measurements along streams and rivers. 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_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_XS A spatial dataset consisting of lines showing the locations of cross sections used for computation of water-surface profiles for 1-D hydraulic models. 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 the data themes and references to other relevant information. FEMA, Mapping Information Platform mailing

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Washington District of Columbia 20472 USA 1-877-336-2627 miphelp@riskmapcds.com 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 2022052107544200TRUEfile://\\halff\Offices\Citrix\33000s\33606\003_Lampasas\Report\Lampasas\DigitalSubmit\480393_Hydraulics_metadataLocal Area Network