Martin, Z.W. 20170201 Raster Digital Data Set https://doi.org/10.5066/F7QZ2836 Martin, Z.W. 20170201 Publication (Other) Scientific Investigations Report 2016-5179 Reston, Virginia U.S. Geological Survey http://doi.org/10.3133/sir20165179 Digital flood-inundation maps for a 6.6-mile reach of the St. Joseph River at Elkhart, Indiana were created by the U.S. Geological Survey (USGS) in cooperation with the Indiana Office of Community and Rural Affairs. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science Web site at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at the USGS streamgage 04101000, St. Joseph River at Elkhart, Ind. Near-real-time stages at this streamgage may be obtained on the Internet from the USGS National Water Information System at http://waterdata.usgs.gov/ or the National Weather Service (NWS) Advanced Hydrologic Prediction Service at http:/water.weather.gov/ahps/, which also forecasts flood hydrographs at this site (NWS site EKMI3). Flood profiles were computed for the USGS streamgage 04101000, St. Joseph River at Elkhart, Ind., reach by means of a one-dimensional step-backwater hydraulic modeling software developed by the U.S. Army Corps of Engineers. The hydraulic model was calibrated using the current stage-discharge rating at the USGS streamgage 04101000, St. Joseph River at Elkhart, Ind. The hydraulic model was then used to compute 6 water-surface profiles for flood stages at 1-foot (ft) intervals referenced to the streamgage datum ranging from 23.0 ft (the NWS “action stage”) to 28.0 ft, which is the highest stage interval of the current USGS stage-discharge rating curve and 1 ft higher than the NWS “major flood stage.” The simulated water-surface profiles were then combined with a Geographic Information System digital elevation model (derived from light detection and ranging [lidar]) data having a 0.49-ft root mean squared error and 4.9-ft horizontal resolution) to delineate the area flooded at each stage. The availability of these maps, along with Internet information regarding current stage from the USGS streamgage and forecasted high-flow stages from the NWS, will provide emergency management personnel and residents with information that is critical for flood response activities such as evacuations and road closures, as well as for post-flood recovery efforts. This dataset was created to support the development of flood-inundation maps for a reach of the St. Joseph River at Elkhart, Indiana. Flood-inundation maps were created for USGS streamgage 04101000, St. Joseph River at Elkhart, Indiana, which is also a NWS flood-forecast point. The maps were created in a GIS by combining the water-surface profiles and digital elevation model data. The digital elevation model (DEM) data were derived from LiDAR data with horizontal resolution of 4.9 ft and vertical accuracy of 0.98 ft at a 95-percent confidence level based on a root mean squared error of 0.49 ft for the open terrain land-cover category. Estimated flood-inundation boundaries for each simulated profile were developed with HEC-GeoRAS software. HEC-GeoRAS is a set of procedures, tools, and utilities for processing geospatial data in ArcGIS by using a graphical user interface. The interface allows the preparation of geometric data for import into HEC-RAS and processes simulation results exported from HEC-RAS. USGS personnel then modified the HEC-GeoRAS results to ensure a hydraulically reasonable transition of the boundary between modeled cross sections relative to the contour data for the land surface. The maps show estimated flood-inundated areas for each of the water-surface profiles that were generated by the hydraulic model. For more information on data processing and checking procedures, see the full report at http://pubs.usgs.gov/sir/2016/5179. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, this metadata file may include some ArcGIS-specific terminology. 20111001 ground condition Complete None planned -86.045066827 -85.974534296 41.692895349 41.674435247 USGS Thesaurus floods hydrology maps and atlases streamflow geospatial analysis geospatial datasets hydraulic engineering Marine Realms Information Bank (MRIB) keywords river stream floodplain ISO 19115 Topic Category inlandWaters Alexandria Digital Library Feature Type Thesaurus floodplains None flood-inundation maps high-water marks USGS Metadata Identifier USGS:588a6d47e4b0ad67323e7773 Common geographic areas Elkhart Indiana United States None City of Elkhart St. Joseph River None. This dataset is provided by USGS as a public service. Users of this geospatial database and geologic information derived there from should acknowledge the U.S. Geological Survey as the source of the data. Users must assume responsibility to determine the appropriate use of this data. Users should be aware of the limitations of this dataset if using for critical application. U.S. Geological Survey, Midwest Region Zachary W Martin Hydrologist mailing address

5957 Lakeside Boulevard

Indianapolis IN 46278 United States 317-600-2732 317-290-3313 zmartin@usgs.gov U.S. Geological Survey, Indiana-Kentucky Water Science Center Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2 (Build 3552) Service Pack N/A (Build N/A) Attributes for water-surface elevation were input from the HEC-RAS model output data table. Flow input data for the HEC-RAS model were obtained from the current stage-discharge relation (USGS rating no. 11.0) at the USGS streamgage 04101000 St. Joseph River at Elkhart, Indiana. There are no unclosed polygons or intersections without nodes. The ArcGIS geodatabase topology tools were used to make corrections using rules including no gaps, no duplicate lines with the same beginning and ending nodes. This dataset is complete; there are no planned revisions or updates at this time. Used cross-section data points from surveyed data, accurate to the datum of the survey. Used cross-section data points from surveyed data, accurate to the datum of the survey. Vertical accuracy to the input Lidar DEM dataset. Woolpert, Inc. 20111130 Raster Digital Data Set Unpublished Unpublished http://gis.iu.edu/ Digital and/or Hardcopy Resources 20110302 20110421 ground condition Indiana 2011-2013 LiDAR Source information used in support of the development of the data set. Flood-inundation maps were created for USGS streamgage 04101000, St. Joseph River at Elkhart, Indiana, which is also a NWS flood-forecast point. The maps were created in a GIS by combining the water-surface profiles and digital elevation model data. The digital elevation model (DEM) data were derived from LiDAR data with horizontal resolution of 4.9 ft and vertical accuracy of 0.98 ft at a 95-percent confidence level based on a root mean squared error of 0.49 ft for the open terrain land-cover category. Estimated flood-inundation boundaries for each simulated profile were developed with HEC-GeoRAS software. HEC-GeoRAS is a set of procedures, tools, and utilities for processing geospatial data in ArcGIS by using a graphical user interface. The interface allows the preparation of geometric data for import into HEC-RAS and processes simulation results exported from HEC-RAS. USGS personnel then modified the HEC-GeoRAS results to ensure a hydraulically reasonable transition of the boundary between modeled cross sections relative to the contour data for the land surface. The maps show estimated flood-inundated areas for each of the water-surface profiles that were generated by the hydraulic model. For more information on data processing and checking procedures, see the full report at http://pubs.usgs.gov/sir/2016/5179. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, this metadata file may include some ArcGIS-specific terminology. Unknown Raster Grid Cell 665 1924 1 State Plane Coordinate System 1983 1301 328083.333333 820208.333333 -85.6666666667 37.5 row and column 10.0 10.0 Foot_US D_North_American_1983 GRS_1980 6378137.0 298.257222101 Attribute Table Table containing attribute information associated with the data set. Producer defined Value Flood-inundation depth values. ESRI ArcMap 10.2 0.00018310546875 38.6807250976563 feet Each depth grid file corresponds to an estimated flood depth values for stream stages 23-28 feet at the USGS streamgage 04101000 St. Joseph River at Elkhart, Indiana. The range listed in the metadata file is for the stjelkin_28 depth grid. Martin, Z.W., 2016, Flood-inundation maps for the St. Joseph River at Elkhart, Indiana: U.S. Geological Survey Scientific Investigations Report 2016-5179, 10 p. U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States (303) 202 4220 sciencebase@usgs.gov This database, identified as SIR 2016-5179, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. This coverage may be redistributed if it is not edited and is properly referenced. Raster Digital Data Set https://doi.org/10.5066/F7QZ2836 None. No fees are applicable for obtaining the data set. 20200827 Zachary W Martin U.S. Geological Survey, Midwest Region Hydrologist mailing address

5957 Lakeside Boulevard

Indianapolis IN 46278 United States 317-600-2732 317-290-3313 zmartin@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998