Namjeong Choi 20230227 raster digital data Denver, Colorado U.S. Geological Survey https://doi.org/10.5066/P9332MFT Namjeong Choi 2023 Publication (Other) Scientific Investigations Report 2023-5001 Reston, Virginia U.S. Geological Survey https://doi.org/10.3133/sir20235001 This data release documents the digital data used to produce flood-inundation maps for a range of gage heights (stages) for the Sabinal River near Utopia, Tex. The simulated flood-inundation maps correspond to a range in stage from 7 to 24 feet (ft) at U.S. Geological Survey (USGS) streamgage 08197970 Sabinal River at Utopia, Tex. at intervals of 0.5-ft. The maps were created for a 10-mile reach of the Sabinal River extending from USGS streamgage 08197936 Sabinal River below Mill Creek near Vanderpool, Tex. to USGS streamgage 08197970 Sabinal River at Utopia, Tex. (hereinafter referred to as the “Utopia gage”) and 7-mile reach of the West Sabinal River were created by the USGS in cooperation with the Bandera County River Authority and Groundwater District and with the Texas Water Development Board. Stage data are collected every 5 minutes and used for estimating areas of inundation near the Utopia gage; the stage data are available from the USGS National Water Information System (NWIS) online database at https://dx.doi.org/10.5066/F7P55KJN (gage information are also directly accessible at https://waterdata.usgs.gov/nwis/). The companion interpretive report (larger work citation) accompanying these digital data is Choi, N., 2023, Flood-inundation maps created using a synthetic rating curve for a 10-mile reach of the Sabinal River and a 7-mile reach of the West Sabinal River near Utopia, Texas, 2021: U.S. Geological Survey Scientific Investigations Report 2023–5001, 18 p., https://doi.org/10.3133/sir20235001. Flood profiles were computed for the stream reach by means of a two-dimensional unsteady state diffusion wave model, Hydrologic Engineering Center's River Analysis System (HEC–RAS; Davidian, 1984; U.S. Army Corps of Engineers, 2016a, b, c). The model results were validated using a synthetic stage-discharge relation at the Utopia gage; the synthetic rating curve was developed based on a regional regression equation by Asquith and others (2013). Detailed information about the methods and data used for this analysis are provided in the companion interpretive report. The flood-inundation maps can be accessed through the Interagency Flood Risk Management Flood Decision Support Toolbox website at https://webapps.usgs.gov/infrm/fdst/. A library of 35 flood-inundation maps at 0.5 ft increments ranging in stage from 7- to 24-ft was prepared for use as a quick reference guide. The map library identifies areas likely to be flooded throughout a range of high-streamflow conditions depending on the stage. Real-time stage data obtained from the Utopia gage can be used to select which flood-inundation maps are of interest during a flood. The flood-inundation maps and HEC–RAS model documented by this data release and its companion interpretive report will be made available as part a flood preparedness toolset for the Sabinal River at the Utopia gage. The toolset is intended to provide emergency management personnel and residents with information to aid with flood response activities such as evacuations and road closures, as well information for use in post-flood recovery efforts. The discharge input for the two-dimensional unsteady state diffusion wave model (hydraulic model) used to generate the data documented in this data release was estimated by using a synthetic stage-discharge relations (rating curve) at the Utopia gage. The synthetic rating curve was developed using the regional regression equation suggested by Asquith and others (2013), which estimates discharge for ungaged sites using the characteristics of a cross-section of the river at the streamgage and regional climate factors. The hydraulic model was then used to determine 35 water-surface profiles for flood stages at 0.5-ft intervals referenced to the streamflow gaging station datum and ranging from approximately bankfull (7 ft) to the estimate peak stage during July, 2002 flood (24 ft). The water-surface profiles were translated into flood-inundation areas and depths using a GIS application with available Light Detection and Ranging (Lidar) digital elevation model (DEM) data. This data set includes the resulting flood depth grids (for example, .tiff file 08197970-13430, corresponding to the river stage of 1,343 ft). The flood-inundation maps produced from this study need to be used with precaution as some uncertainty is associated. The hydraulic model that was created for producing flood-inundation maps in this study is not calibrated as there is no stage-discharge rating curve available at the Utopia gage at the time of the study, as of May 2022. Moreover, the synthetic rating curve that was used to estimate discharge for modeled river stages at the Utopia gage is based on a regional regression equation, which introduces a greater uncertainty than a conventional rating curve. Estimated flood-inundation extents inherently include uncertainty based on many factors, including the accuracy of input floodplain elevation data, cross-sectional survey quality, and distance from the reference streamgage, among other things. 20180212 20200306 ground condition Complete None planned -99.60116 -99.51818 29.72054 29.60713 ISO 19115 Topic Category inlandWaters Marine Realms Information Bank (MRIB) keywords stream floodplain river USGS Thesaurus maps and atlases streamflow geospatial analysis hydrology geospatial datasets floods hydraulic engineering Alexandria Digital Library Feature Type Thesaurus floodplains None high-water marks flood-inundation maps geospatial data geographic information system GIS model archive hydraulic model USGS Metadata Identifier USGS:61e8ab1bd34e8b818ad8985b None Sabinal River Uvalde County Common geographic areas Uvalde Bandera Texas United States None. None. Users are responsible for understanding the appropriate use and limitations of this dataset as explained in the Distribution Liability section. U.S. Geological Survey Public Information Officer mailing address

1505 Ferguson Lane

Austin TX 78754 United States 512-927-3500 otpublicinfo@usgs.gov U.S. Geological Survey, Oklahoma-Texas Water Science Center Environment as of Metadata Creation: Microsoft Windows 10 Version 20H2 (Build 19042.1415); Esri ArcGIS 10.8.1 Version 10.8.1.14362; HEC–RAS River Analysis System 5.0.7 March 2019 Not Applicable Not Applicable This dataset is complete; there are no planned revisions or updates at this time. Not Applicable Namjeong Choi 2023 publication U.S. Geological Survey Scientific Investigation Report 2023–5001 18 p. https://doi.org/10.3133/sir20235001 Digital and/or Hardcopy 2023 publication date Choi, 2023 The data is accompanied by the report. William H Asquith George R Herrmann Theodore G Cleveland 20130916 publication Journal of Hydrologic Engineering: American Society of Civil Engineers, Vol. 18, No. 10, pp. 1331–1348. https://ascelibrary.org/doi/10.1061/%28ASCE%29HE.1943-5584.0000635 Digital and/or Hardcopy 20130916 publication date Asquith and others, 2013 The regional regression equation in this journal paper was used to create a synthetic rating curve for the study. Jacob Davidian 19840000 publication U.S. Geological Survey Techniques of Water-Resources Investigations TWRI 3-A15 p.48 https://doi.org/10.3133/twri03A15 Digital and/or Hardcopy 19840000 publication date Davidian, 1984 The method was used for the HEC–RAS model development. U.S. Army Corps of Engineers 20160200 publication ver. 5.0, February 2016, p.171 https://www.hec.usace.army.mil/software/hec-ras/documentation/HEC-RAS%205.0%202D%20Modeling%20Users%20Manual.pdf Digital and/or Hardcopy 20160200 publication date U.S. Army Corps of Engineers, 2016a HEC–RAS model manual U.S. Army Corps of Engineers 20160200 publication ver. 5.0, February 2016, p.547 https://www.hec.usace.army.mil/software/hec-ras/documentation/HEC-RAS%205.0%20Reference%20Manual.pdf Digital and/or Hardcopy 20160200 publication date U.S. Army Corps of Engineers, 2016b HEC–RAS model manual U.S. Army Corps of Engineers 20160200 publication ver. 5.0, February 2016, p.962 https://www.hec.usace.army.mil/software/hec-ras/documentation/HEC-RAS%205.0%20Users%20Manual.pdf Digital and/or Hardcopy 20160200 publication date U.S. Army Corps of Engineers, 2016c HEC–RAS model manual U.S. Geological Survey 2023 application/service https://doi.org/10.5066/F7P55KJN Digital and/or Hardcopy 2023 observed NWIS Streamflow gaging station data U.S. Geological Survey 2023 application/service https://webapps.usgs.gov/infrm/fdst/ Digital and/or Hardcopy 2023 publication date FDST Flood-inundation map library web viewer U.S. Geological Survey 20170000 raster digital data https://www.sciencebase.gov/catalog/item/543e6b86e4b0fd76af69cf4c https://viewer.nationalmap.gov/ https://nationalmap.gov/3DEP/ Digital and/or Hardcopy 20150100 ground condition DEM, 2017 One-meter lidar DEM for creating model terrain U.S. Geological Survey 20191126 raster digital data https://www.sciencebase.gov/catalog/item/5dadee41e4b09fd3b0c9d8ed https://www.mrlc.gov/viewer/ Digital and/or Hardcopy 20010000 20160000 ground condition NLCD, 2016 Landcover data to estimate terrain and channel roughness David S. Wallace Florence, Thompson 20220000 application/service U.S. Geological Survey software release https://doi.org/10.5066/P92EAYSO https://code.usgs.gov/water/OTWSC/infrm-fdst-toolbox Digital and/or Hardcopy 20220000 publication date Wallace and Thompson, 2022 The flood-inundation depth grids were processed using this geoprocessing tool to meet the Flood Decision Support Toolbox (FDST) format requirements. The flood-inundation maps cover a 10-mi reach of Sabinal River from the USGS streamflow-gaging station 08197936 Sabinal River below Mill Creek near Vanderpool, TX to the USGS streamflow gaging station 08197970 Sabinal River at Utopia, TX (hereinafter referred to as Utopia gage) as well as the 7-mi reach of West Sabinal River. The U.S. Army Corps of Engineers (USACE) Hydrologic Engineering Center River Analysis System (HEC–RAS) program was used to compute water-surface elevations. A two-dimensional unsteady model was developed with the terrain input from one-meter light detection and ranging (lidar) data and the roughness input from National Land Cover Database (NLCD). The initial model results referenced UTM Zone 14N, which coincides with the horizontal coordinate system of the lidar data. The regional regression equation suggested by Asquith (2013) was used to create a synthetic stage-discharge relation for the Utopia gage, which was also used to calibrate the model. Thirty-five flood-inundation maps that correspond to the river stage at the Utopia gage range from 7 ft, or near bankfull, to 24 ft, which matches the peak flow stage during July 5, 2002 flood, with half-foot intervals. The simulated water-surface elevations were then combined with the terrain to delineate flood-inundation depth grids for each river stage. The depth grid files were processed using the geoprocessing tool to meet the Flood Decision Support Toolbox (FDST) requirement which converted depth data to 16-bit unsigned integer format with a precision of 0.1 ft (Wallace & Thompson, 2022). To obtain the modeled flood depth, the depth data need to be divided by 10. The final flood depths grids referenced WGS 1984 Web Mercator Auxiliary Sphere as a horizontal coordinate system for mapping purposes. 20220930 Raster Grid Cell 4843 3079 Mercator 0 0 0 0 coordinate pair 3 3 meters World Geodetic System 1984 (WGS 84) WGS_1984 6378137.0 298.257 08197970-13430.tif Flood-inundation depth layer at stage 1,343.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13435.tif Flood-inundation depth layer at stage 1,343.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13440.tif Flood-inundation depth layer at stage 1,344.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13445.tif Flood-inundation depth layer at stage 1,344.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13450.tif Flood-inundation depth layer at stage 1,345.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13455.tif Flood-inundation depth layer at stage 1,345.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13460.tif Flood-inundation depth layer at stage 1,346.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13465.tif Flood-inundation depth layer at stage 1,346.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13470.tif Flood-inundation depth layer at stage 1,347.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13475.tif Flood-inundation depth layer at stage 1,347.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13480.tif Flood-inundation depth layer at stage 1,348.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13485.tif Flood-inundation depth layer at stage 1,348.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13490.tif Flood-inundation depth layer at stage 1,349.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13495.tif Flood-inundation depth layer at stage 1,349.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13500.tif Flood-inundation depth layer at stage 1,350.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13505.tif Flood-inundation depth layer at stage 1,350.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13510.tif Flood-inundation depth layer at stage 1,351.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13515.tif Flood-inundation depth layer at stage 1,351.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13520.tif Flood-inundation depth layer at stage 1,352.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13525.tif Flood-inundation depth layer at stage 1,352.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13530.tif Flood-inundation depth layer at stage 1,353.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13535.tif Flood-inundation depth layer at stage 1,353.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13540.tif Flood-inundation depth layer at stage 1,354.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13545.tif Flood-inundation depth layer at stage 1,354.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13550.tif Flood-inundation depth layer at stage 1,355.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13555.tif Flood-inundation depth layer at stage 1,355.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13560.tif Flood-inundation depth layer at stage 1,356.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13565.tif Flood-inundation depth layer at stage 1,356.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13570.tif Flood-inundation depth layer at stage 1,357.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13575.tif Flood-inundation depth layer at stage 1,357.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13580.tif Flood-inundation depth layer at stage 1,358.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13585.tif Flood-inundation depth layer at stage 1,358.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13590.tif Flood-inundation depth layer at stage 1,359.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13595.tif Flood-inundation depth layer at stage 1,359.5 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined 08197970-13600.tif Flood-inundation depth layer at stage 1,360.0 ft above NAVD88 at USGS gage 08197970. The data are stored in 16-bit unsigned integer data format with a precision of 0.1 ft. To obtain the modeled flood depth, divide the raster value by 10. Producer Defined U.S. Geological Survey USGS ScienceBase mailing

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Austin TX 78754 United States 512-927-3500 otpublicinfo@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998