Texas Water Development Board (TWDB) CTP FY2017 Risk MAP Project 20200417 Version 2.5.3.6 FEMA-DCS-Hydraulics Austin, TX Federal Emergency Management Agency https://hazards.fema.gov Federal Emergency Management Agency 20200417 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. 20200417 MIP Submission Date In work Unknown -98.56 -97.39 31.61 30.79 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 LAMPASAS HYDROLOGIC UNIT 12070203 COUNTY BELL COUNTY BURNET COUNTY CORYELL COUNTY HAMILTON COUNTY LAMPASAS COUNTY MILLS COUNTY WILLIAMSON COUNTY-FIPS 027 COUNTY-FIPS 053 COUNTY-FIPS 099 COUNTY-FIPS 193 COUNTY-FIPS 281 COUNTY-FIPS 333 COUNTY-FIPS 491 COMMUNITY CITY OF AUSTIN COMMUNITY CITY OF BARTLETT COMMUNITY CITY OF BELTON COMMUNITY CITY OF BERTRAM COMMUNITY CITY OF BURNET COMMUNITY CITY OF CEDAR PARK COMMUNITY CITY OF COPPERAS COVE COMMUNITY CITY OF COTTONWOOD SHORES COMMUNITY CITY OF EVANT COMMUNITY CITY OF FLORENCE COMMUNITY CITY OF GATESVILLE COMMUNITY CITY OF GEORGETOWN COMMUNITY CITY OF GRANGER COMMUNITY CITY OF GRANITE SHOALS COMMUNITY CITY OF HARKER HEIGHTS COMMUNITY CITY OF HIGHLAND HAVEN COMMUNITY CITY OF HOLLAND COMMUNITY CITY OF HORSESHOE BAY COMMUNITY CITY OF JARRELL COMMUNITY CITY OF KILLEEN COMMUNITY CITY OF LEANDER COMMUNITY CITY OF LIBERTY HILL COMMUNITY CITY OF LITTLE RIVER-ACADEMY COMMUNITY CITY OF MARBLE FALLS COMMUNITY CITY OF MCGREGOR COMMUNITY CITY OF MEADOWLAKES COMMUNITY CITY OF MORGANS POINT RESORT COMMUNITY CITY OF NOLANVILLE COMMUNITY CITY OF OGLESBY COMMUNITY CITY OF ROGERS COMMUNITY CITY OF ROUND ROCK COMMUNITY CITY OF SOUTH MOUNTAIN COMMUNITY CITY OF TAYLOR COMMUNITY CITY OF TEMPLE COMMUNITY CITY OF THRALL COMMUNITY CITY OF TROY COMMUNITY CITY OF WEIR COMMUNITY FORT HOOD MILITARY RESERVATION FEMA-CID 480624 FEMA-CID 480707 FEMA-CID 480028 FEMA-CID 481609 FEMA-CID 480092 FEMA-CID 481282 FEMA-CID 480155 FEMA-CID 481614 FEMA-CID 480316 FEMA-CID 480669 FEMA-CID 480156 FEMA-CID 480668 FEMA-CID 481046 FEMA-CID 481149 FEMA-CID 480029 FEMA-CID 481676 FEMA-CID 480030 FEMA-CID 480149 FEMA-CID 480111 FEMA-CID 480031 FEMA-CID 481536 FEMA-CID 480073 FEMA-CID 481579 FEMA-CID 480093 FEMA-CID 480459 FEMA-CID 481613 FEMA-CID 481525 FEMA-CID 480032 FEMA-CID 480769 FEMA-CID 480708 FEMA-CID 481048 FEMA-CID 480317 FEMA-CID 480670 FEMA-CID 480034 FEMA-CID 481632 FEMA-CID 480709 FEMA-CID 481674 FEMA-CID 48FED 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 20200417 Digital 20200417 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. 20200417 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 2020041707544200TRUEfile://\\halff\Offices\Citrix\33000s\33606\003_Lampasas\Report\Lampasas\DigitalSubmit\480393_Hydraulics_metadataLocal Area Network