Shapefile of the flood-inundation maps for North Fork Salt Creek at Nashville, Indiana

digital flood inundation maps for a 3 2 mile reach of north fork salt creek at nashville indiana were created by the u s geological survey usgs in cooperation with the indiana department of transportation 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 03371650 north fork salt creek at nashville ind real time stages at this streamgage may be obtained on the internet from the usgs national water information system at http waterdata usgs gov nwis or the national weather service nws advanced hydrologic prediction service at http water weather gov ahps nws site nfsi3 flood profiles were computed for the stream 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 03371650 north fork salt creek at nashville ind the hydraulic model was then used to compute 12 water surface profiles for flood stages at 1 foot ft intervals except for the highest profile of 22 9 ft referenced to the streamgage datum ranging from 12 0 ft the nws action stage to 22 9 ft which is the highest stage of the current usgs stage discharge rating curve and 1 9 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 98 foot vertical accuracy and 4 9 foot horizontal resolution to delineate the area flooded at each stage the availability of these maps along with information regarding current stage from the usgs streamgage 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