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 "description": "Digital flood-inundation maps for a 6-mile reach of the Hohokus Brook from White\u2019s Lake Dam in Waldwick Borough, through Ho-Ho-Kus Borough to Grove Street in the Village of Ridgewood , New Jersey, were created by the U.S. Geological Survey (USGS) in cooperation with the New Jersey Department of Environmental Protection (NJDEP). 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 Hohokus Brook at Ho-ho-kus, New Jersey (sta. no. 01391000). Current conditions at the USGS streamgage may be obtained on the Internet. 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 collocated at USGS streamgages. The forecasted peak-stage information, also available on the Internet, 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. The model was calibrated using the most current stage-discharge relations at the Hohokus Brook at Ho-ho-kus, New Jersey gage and documented high-water marks from recent floods. The hydraulic model was then used to determine 12 water-surface profiles for flood stages at 0.5-ft intervals referenced to the streamgage datum and ranging from bankfull to approximately the highest recorded water level at the streamgage. The flood-peak inundation area was modeled in a GIS by combining high-water mark data, and/or steady-state hydraulic modeling and available Lidar digital elevation model (DEM) data as part of the U.S. Geological Survey study of the flood of flooding in Ho-ho-kus, New Jersey. Information about the study, floods, and methods used can be found in the USGS Scientific Investigations Report 2015-5064. http://pubs.er.usgs.gov/publication/sir5064",
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