Flood-inundation maps for the Saddle River from Rochelle Park to Lodi, New Jersey, 2012

Abstract

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov 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 report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. AcknowledgmentsThe authors wish to thank the many local, State, and Federal agencies that have cooperated in the funding for the operation and maintenance of the streamgage used for this study, especially the New Jersey Department of Environmental Protection and the U.S. Army Corps of Engineers, New York District. Special thanks are given to National Technological Hazards Management Consulting, Inc., for their cooperation in providing the hydrologic model for this study and to the National Weather Service for their continued support of the U.S. Geological Survey flood-inundation mapping initiative. AbstractDigital flood-inundation maps for a 2.75-mile reach of the Saddle River from 0.2 mile upstream from the Interstate 80 bridge in Rochelle Park to 1.5 miles downstream from the U.S. Route 46 bridge in Lodi, 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 Saddle River at Lodi, New Jersey (station 01391500). Current conditions for estimating near real-time areas of inundation using USGS streamgage information may be obtained on the Internet at http://waterdata.usgs.gov/nwis/uv?site_no=01391500. The National Weather Service (NWS) forecasts flood hydrographs at many places that are often collocated with USGS streamgages. NWS-forecasted peak-stage information 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 stagedischarge relations at the Saddle River at Lodi, New Jersey streamgage and documented high-water marks from recent floods. The hydraulic model was then used to determine 11 water-surface profiles for flood stages at the Saddle River streamgage at 1-ft intervals referenced to the streamgage datum, North American Vertical Datum of 1988 (NAVD 88), and ranging from bankfull, 0.5 ft below NWS Action Stage, to the exten...

A software tool for rapid flood inundation mapping

“…These 11 sites were selected by FIM Program staff to represent a variety of topographic and hydraulic settings and were locations that already had flood inundation map libraries created using one-dimensional hydraulic models (Benedict and others, 2013;Czuba and others, 2014;Flynn and others, 2012;Fowler, 2014;Hoppe and Watson, 2012;Iowa Flood Information System, 2016;Lombard, 2013;Murphy and others, 2012;Roland and Hoffman, 2011;Roland and others, 2014;Storm, 2012). These sites all correspond to National Weather Service (NWS) Flood Forecast points.…”