{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "US Geological Survey, Central Midwest Water Science Center", "hasEmail": "mailto:aemanaster@usgs.gov"}, "description": "Digital flood-inundation maps for about an 8-mile reach of the Little Calumet River, Illinois, were created by the U.S. Geological Survey (USGS) in cooperation with the U.S. Army Corps of Engineers. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Program website at https://www.usgs.gov/mission-areas/water-resources/science/flood-inundation-mapping-fim-program, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at three USGS streamgages: Little Calumet River at South Holland, Illinois (USGS station 05536290); Little Calumet River at Munster, Indiana (USGS station 05536195); and Thorn Creek at Thornton, Illinois (USGS station 05536275). Near-real-time stages at these streamgages may be obtained on the internet from the USGS National Water Information System at https://doi.org/10.5066/F7P55KJN or the National Weather Service (NWS) Advanced Hydrologic Prediction Service at https://water.weather.gov/ahps/, which also forecasts flood hydrographs at this site.\nFlood profiles were computed for the stream reaches using a one-dimensional unsteady flow step-backwater hydraulic model. The model performance was evaluated using historical streamflow measurements and the most current stage-discharge relations at the USGS streamgages at Little Calumet River at South Holland, Illinois; Little Calumet River at Munster, Indiana; and Thorn Creek at Thornton, Illinois. The model was used to compute 24 water-surface profiles at 1-foot intervals referenced to the streamgage datum and ranging from bankfull to about the 0.2-percent annual-exceedance probability flood (500-year recurrence interval flood). The simulated water-surface profiles were then combined with a geographic information system digital elevation model (derived from light detection and ranging data having a 0.6-foot vertical accuracy and a 2-foot horizontal resolution) to delineate the area flooded at each water level. Breach shapefiles were included in this study to determine the extent of flooding if the river breached a levee in the nearby vicinity. The resultant flooding area is deemed the \u2018area of uncertainty\u2019 in the flood-inundation maps.\nThe availability of these maps, along with internet information regarding current stage from USGS streamgages 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 postflood recovery efforts.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P99L14DN", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.5ec58ae882ce476925ebbbf5.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5ec58ae882ce476925ebbbf5", "keyword": ["Illinois", "Lansing, South Holland, Calumet City", "Little Calumet River", "USGS:5ec58ae882ce476925ebbbf5", "flood", "flood-inundation maps", "flooded area", "geospatial analysis", "river/stream"], "modified": "2022-09-27T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-87.61280, 41.56210, -87.52040, 41.62440", "theme": ["geospatial"], "title": "Flood-Inundation Shapefiles for Little Calumet River from Lansing to South Holland, Illinois, 2020"}