engutf8datasetdatasetUS Geological SurveyASK USGS - Water Webserver Team1-888-275-8747 (1-888-ASK-USGS)507 National CenterRestonVirginia20192USpointOfContact2014-05-28ISO 19139 Geographic Information - Metadata - Implementation Specification20072row1430column1861vertical1areafalsefalsegeometryOnlycomposite1geometryOnlycomposite1geometryOnlycomposite1geometryOnlycomposite13857EPSG7.11.223_0_proj2013-12-12creationUS Geological Survey, Mississippi Water Science CenteroriginatorUS Geological SurveyReston, VApublishermapDigitalScientific Investigation MapSIM 33009An Expanded Model: Flood-Inundation Maps for the Leaf River at Hattiesburg, Mississippi, 2013Digital flood-inundation maps for a 6.8-mile reach of the Leaf River at Hattiesburg, Mississippi (Miss.), were created by the U.S. Geological Survey (USGS) in cooperation with the City of Hattiesburg, City of Petal, Forrest County, Mississippi Emergency Management Agency, Mississippi Department of Homeland Security, and the Emergency Management District. 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 the USGS streamgage at Leaf River at Hattiesburg, Miss. (station no. 02473000). Currentconditions for estimating near-real-time areas of inundation by use of USGS streamgage information may be obtained on the Internet at http://waterdata.usgs.gov/. In addition, the information has been provided to the National Weather Service (NWS) for incorporation into their Advanced Hydrologic Prediction Service (AHPS) flood warning system (http:/water.weather.gov/ahps/). The NWS forecasts flood hydrographs at many places that are often colocated with USGS streamgages. NWS-forecasted peak-stage information may be used in conjunction with the maps developed in this study to show predictedareas of flood inundation. In this study, flood profiles were computed for the stream reach by means of a one-dimensional step-backwater model. The model was calibrated by using the most current stage-discharge relations at the Leaf River at Hattiesburg, Miss. streamgage (02473000) and documented high-water marks from recent and historical floods. The hydraulic model was then used to determine 13water-surface profiles for flood stages at 1.0-foot 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 (GIS) digital elevation model (DEM, derived from light detection and ranging (lidar) data having a 0.6-foot vertical and 9.84-foot horizontal resolution) in order to delineate the area flooded at each water level.Development of the estimated flood inundation maps as described in this report update previously published inundation estimates by including reaches of the Bouie and Leaf Rivers above their confluence. The availability of these maps along with Internet information regarding current stage from USGS streamgages and forecasted stream stages from the NWS 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 Leaf River at Hattiesburg, MS.completedUS Geological Survey, Mississippi Water Science Center601-933-2900308 South Airport RoadJacksonMississippi39208USpointOfContactasNeededBouie RiverHattiesburgUSAForrest CountyMississippiPetalUnited StatesLeaf RiverGordon CreekplaceBoard of Geographic Nameshigh-water marksgeospatial analysisfloodflooded areaflood-inundation mapsriver/streamthemeDownloadable DataUncertainties 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 selected USGS streamgages. Water-surface elevations along the stream reaches were estimated by steady-state hydraulic modeling, assuming unobstructed flow, and using streamflows and hydrologic conditions anticipated at the USGS streamgage. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of December 2013. 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. 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 the 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: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf.An Expanded Model: Flood-Inundation Maps for the Leaf River at Hattiesburg, Mississippi, 20132013-12-12creationU.S. Geological Survey, Mississippi Water Science CenteroriginatorU.S. Geological SurveyReston, VApublisherdocumentHardcopyScientific Investigations MapSIM 33009Storm, J.B., 2014, An Expanded Model: Flood-Inundation Maps for the Leaf River at Hattiesburg, Mississippi: U.S. Geological Survey Scientific Investigations Map 3300, 9 p.largerWorkCitationAn Expanded Model: Flood-Inundation Maps for the Leaf River at Hattiesburg, Mississippi, 20132013-12-12creation2014-03-01publicationUS Geological Survey, Mississippi Water Science CenteroriginatorUS Geological SurveyReston, VApublishermapDigitalScientific Investigations MapSIM 33009crossReferencevectorengutf8inlandWaterselevationMicrosoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143-89.314298-89.24973531.29732431.363962true-89.314293-89.24312231.29588231.363778true-89.314257-89.2498431.29749931.363779ground conditiontrue-89.314293-89.24312231.29588231.363779Flood-inundation maps were created for USGS streamgage 02473000 Leaf River at Hattiesburg, MS, 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 a 9.84-ft horizontal resolution and a 0.6-ft vertical accuracy. 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 iin 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 overlaid on high-resolution, geo-referenced, aerial photographs of the study area 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 https://pubs.usgs.gov/sim/3300. 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 Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology.ShapefileU.S. Geological Survey1-888-ASK-USGSUSGS Information ServicesDenverColorado80225UShttp://answers.usgs.govContact via emaildistributor11.233http://water.usgs.gov/osw/flood_inundation/0.196https://pubs.usgs.gov/sim/3228datasetThis data set is complete.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.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.Used cross-section data points from surveyed data, accurate to the datum of the survey. Vertical accuracy to the input Lidar DEM dataset.Used cross-section data points from surveyed data, accurate to the datum of the survey.Attributes for water surface elevation were input from the HEC-RAS model output data table. Peak Flow input data for the HEC-RAS model were obtained from the most current stage-discharge relation at the USGS streamgage 02473000 Leaf River at Hattiesburg, MS.Flood-inundation maps were created for USGS streamgage 02473000 Leaf River at Hattiesburg, MS, 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 9.84-ft horizontal resolution and a vertical accuracy of 0.6-ft. The DEM was re-sampled to a 10-ft cell size. 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. The maps show estimated flood-inundated areas overlaid on high-resolution, geo-referenced, aerial photographs of the study area 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 https://pubs.usgs.gov/sim/3300.asNeededLast metadata review date: 20140528