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RQAUUUUAFFFFAH//2Q==This is a shapefile with the lines delineating the flood inundation extent pertaining to a selected stage level for the USGS streamgage Hohokus Brook at Ho-ho-kus, New Jersey (sta. no. 01391000).<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Digital flood-inundation maps for a 6-mile reach of the </SPAN><SPAN><SPAN>Hohokus Brook from White’s Lake Dam in Waldwick Borough, through Ho-Ho-Kus Borough to Grove Street in the Village of Ridgewood , New Jersey</SPAN></SPAN><SPAN>, 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</SPAN></P></DIV></DIV></DIV>floodriver/streamflood-inundation mapshigh-water marksflooded areageospatial analysis<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>UNCERTAINTIES AND LIMITATIONS REGARDING USE OF FLOOD INUNDATION MAPS The flood boundaries shown were estimated based on water stages/streamflows at the USGS streamflow-gaging station Hohokus Brook at Ho-ho-kus, New Jersey, (01391000), steady-state hydraulic modeling (assuming unobstructed flow), and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing on August, 2004. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water surface elevations and inundation boundaries shown here. Additional areas may be flooded due to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. The USGS provides these maps "as-is" for a quick reference, emergency planning tool but assumes no legal liability, or responsibility resulting from the use of this information. 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 which may be inherent or factored into NWS forecast procedures. The NWS uses river forecast models to estimate the quantity and timing of water flowing through selected river reaches in the United States. These forecast models (1) estimate the amount of runoff generated by a precipitation event, (2) compute how the water will move downstream, and (3) predict the flow and stage (water surface elevation) for the river at a given location (AHPS forecast point) throughout the forecast period (every six 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.</SPAN></P></DIV></DIV></DIV>2014-07-16T00:00:00Scientific Investigations Report2015-5064New Jersey Water Science CenterUS Geological Survey 3450 Princeton Pike, Suite 110LawrencevilleNew Jersey08648kmwatson@usgs.govUSKara Watsonelev_125_62Digital flood-inundation maps for a 6-mile reach of the Hohokus Brook from White’s Lake Dam in Waldwick Borough, through Ho-Ho-Kus Borough to Grove Street in the Village of Ridgewood , New JerseyNew Jersey Water Science CenterUS Geological Survey3450 Princeton Pike, Suite 110LawrencevilleNew Jersey08648kmwatson@usgs.govUSNone. This dataset is provided by USGS as a public service.Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.31431-74.130275-74.10495741.01487640.967076<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The flood boundaries shown were estimated based on water stages/streamflows at the USGS streamflow-gaging station Hohokus Brook at Ho-ho-kus, New Jersey, [01391000], steady-state hydraulic modeling (assuming unobstructed flow), and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing on [Sept, 2004]. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water surface elevations and inundation boundaries shown here. Additional areas may be flooded due to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. The USGS provides these maps "as-is" for a quick reference, emergency planning tool but assumes no legal liability, or responsibility resulting from the use of this information. 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 which may be inherent or factored into NWS forecast procedures. The NWS uses river forecast models to estimate the quantity and timing of water flowing through selected river reaches in the United States. These forecast models (1) estimate the amount of runoff generated by a precipitation event, (2) compute how the water will move downstream, and (3) predict the flow and stage (water surface elevation) for the river at a given location (AHPS forecast point) throughout the forecast period (every six 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 </SPAN></SPAN></P><P><SPAN /></P><P><SPAN /></P></DIV></DIV></DIV>HEC-RAS model from: Natural and Technological Hazards Management Consulting, Inc., 2004, Final hydrology: Riverine flood insurance studies in FEMA Region II New Jersey FY-03, Saddle River, New Jersey, 107 p.
Numeric hydraulic model was used to compute water surface profiles at selected elevations along mapped reach. The water surface profiles were then used to generate the inundation map boundaries.A GIS application was used to produce a plane representing the flood-peak water surface. The application duplicates the [high-water-mark elevation data points, or water-surface-elevation data from cross-section points of the hydraulic model] across the flood plain perpendicular to the direction of the flood flow. Elevations between [high-water marks, or water-surface points on the cross-sections] are proportional interpolations of the water-surface-elevation data and were positioned to generate a flood surface sloping with the water flow. A raster surface was created with the data points using a spline interpolation method, forming the estimated flood surface. A flood-depth grid was made by subtracting the DEM from the flood surface raster.2014-07-16T00:00:00Used cross-section data points from surveyed data, accurate to the datum of the survey. Flood inundation extent was manually checked by sampling the digital elevation model (DEM) adjacent to high water marks. This check was done to verify that DEM elevations greater than the high-water mark were not in the flood inundation polygon and elevations less than the high water mark were within the flood inundation polygon.http://pubs.er.usgs.gov/publication/sir5064elev_125_62Hohokus Brook at Ho-ho-kus, New Jersey (01391000) flood-peak inundation areaU.S. Geological SurveyFeature Class1FIDFIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeShapeGeometry000Feature geometry.ESRICoordinates defining the features.GRIDCODEGRIDCODEDouble10100Each entity corresponds to an estimated flood extent area for stream stages 2.5-8 feet at the USGS streamgage Hohokus Brook at Ho-ho-kus, New Jersey, 01391000. The attributes represent the USGS station ID, USGS Stage height associated with the area, and NAVD88 elevation that correlates with the stage.Waston, K.M., and Niemoczynski, M.J., 2014, Flood-inundation maps for the Hohokus Brook at Ho-Ho-Kus, New Jersey, 2014: U.S. Geological Survey Scientific Investigations Report 2015-5064, xx p. (http://pubs.er.usgs.gov/publication/sir5064)Shapefile0.097datasetEPSG7.11.21SimpleFALSE1TRUEFALSE20150605