FLOOD-INUNDATION MAPS FOR THE EAST FORK WHITE RIVER AT COLUMBUS, INDIANA By Pamela J. Lombard, 2013 U.S. Geological Survey Scientific Investigations Map 3255 ABSTRACT: Digital flood-inundation maps for a 5.4-mile reach of the East Fork White River at Columbus, Indiana, from where the Flatrock and Driftwood Rivers combine to make up East Fork White River to just upstream of the confluence of Clifty Creek with the East Fork White River, were created by the U.S. Geological Survey (USGS) in cooperation with the Indiana Department of Transportation. The 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 USGS streamgage 03364000, East Fork White River at Columbus, Indiana. Current conditions at the USGS streamgage may be obtained on the Internet from the USGS National Water Information System (http://waterdata.usgs.gov/in/nwis/uv/?site_no=03364000&agency_cd=USGS& ). In addition, the same data are provided to the National Weather Service (NWS) for incorporation into their Advanced Hydrologic Prediction Service (AHPS) flood warning system (http:/water.weather.gov/ahps/). Within this system, the NWS forecasts flood hydrographs for the East Fork White River at Columbus that may be used in conjunction with the maps developed in this study to show predicted areas of flood inundation. In this study, flood profiles were computed for the stream reach by means of a one-dimensional step-backwater model developed by the U.S. Army Corps of Engineers. The hydraulic model was calibrated by using the most current stage-discharge relation at USGS streamgage 03364000, East Fork White River at Columbus, Indiana. The calibrated hydraulic model was then used to determine 15 water-surface profiles for flood stages at 1-foot (ft) intervals referenced to the streamgage datum and ranging from bankfull to approximately the highest recorded water level at the streamgage. 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 0.37-ft vertical accuracy and a 1.02 ft horizontal accuracy), in order to delineate the area flooded at each water level. The availability of these maps, along with Internet information regarding current stage from the USGS streamgage at Columbus, Indiana, and forecasted stream 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. DISCLAIMERS: This data base, identified as SIM 3255, has been approved for release and publication by the Director of the U.S. Geological Survey. Although this database has been subjected to rigorous review and is substantially complete, the U.S. Geological Survey reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the U.S. geological Survey nor the U.S. 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 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. Disclaimer for Flood-Inundation Maps: Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The USGS provides these maps “as-is” for a quick reference, emergency planning tool but assumes no legal liability or responsibility resulting from the use of this information. Uncertainties and Limitations for Use of Flood-Inundation Maps: Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood boundaries shown were estimated based on water stages (water-surface elevations) and streamflows at USGS streamgage 03364000 East Fork White River at Columbus, Ind. Water-surface elevations along the stream reaches were estimated by steady-state hydraulic modeling, assuming unobstructed flow, and using streamflows and hydrologic conditions nticipated at the USGS streamgage(s). The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of November 2011. Unique meteorological factors (timing and distribution of precipitation) may cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to unanticipated conditions such as: changes in the streambed elevation or roughness, backwater into major tributaries along a main stem river, or backwater from localized debris or ice jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate the land surface. Additional uncertainties and limitations pertinent to this study may be described elsewhere in this report. If this series of flood-inundation maps will be used in conjunction with National Weather Service (NWS)river forecasts, the user should be aware of additional uncertainties that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing through selected stream reaches in the United States. These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (water-surface elevation) for the stream at a given location (AHPS forecast point) throughout the forecast period (every 6 hours and 3 to 5 days out in many locations. For more information on AHPS forecasts, please see: ttp://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf. CONTENTS: This report consists of a pamphlet and 15 map sheets. The single metadata file pertains to all of the maps and the shapefile. 00Readme.txt SIM3255_pamphlet.pdf EFWhite_metadata.docx Datafiles depth_grids.zip shapefile.zip The shapefile is as follows: shapefile.zip EFWhite.shp (.dbf/.prj/.sbn/.sbx/.shp.xml/.shx) map_sheets map_sheets.zip (sheets 1 through 15 in .pdf format) sheet01_607.7_sim3255.pdf sheet02_608.7_sim3255.pdf sheet03_609.7_sim3255.pdf sheet04_610.7_sim3255.pdf sheet05_611.7_sim3255.pdf Sheet06_612.7_sim3255.pdf sheet07_613.7_sim3255.pdf sheet08_614.7_sim3255.pdf sheet09_615.7_sim3255.pdf sheet10_616.7_sim3255.pdf sheet11_617.7_sim3255.pdf sheet12_618.7_sim3255.pdf sheet13_619.7_sim3255.pdf sheet14_620.7_sim3255.pdf sheet15_621.7_sim3255.pdf A low-resolution version of the maps is also available: map_sheets_jpg map_sheets_jpg.zip sheet01_607.7_sim3255.jpg sheet02_608.7_sim3255.jpg sheet03_609.7_sim3255.jpg sheet04_610.7_sim3255.jpg sheet05_611.7_sim3255.jpg Sheet06_612.7_sim3255.jpg sheet07_613.7_sim3255.jpg sheet08_614.7_sim3255.jpg sheet09_615.7_sim3255.jpg sheet10_616.7_sim3255.jpg sheet11_617.7_sim3255.jpg sheet12_618.7_sim3255.jpg sheet13_619.7_sim3255.jpg sheet14_620.7_sim3255.jpg sheet15_621.7_sim3255.jpg INSTRUCTIONS AND DOCUMENTATION FOR U.S. GEOLOGICAL SURVEY SCIENTIFIC INVESTIGATIONS MAP 3255 To access the data: The data files can be downloaded via the web from ttp://pubs.usgs.gov/sim/3255.The main product is a Portable Document Format (.pdf) map and pamphlet which requires Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com. Software preferred: Adobe Acrobat (6.x, 7.x, or 8.x), or Adobe Acrobat Pro (6.x, 7.x, or 8.x), or the free Adobe Reader (6.x,7.x, or 8.x), 8.x is preferred.ArcGIS 9.3 referred, older versions may also work. ArcReader may be downloaded free of charge from http://www.esri.com/software/arcgis/arcreader/download.htm for viewing additional files included in this report.