DRAFT *** Susquehanna River at Wilkes-Barre, PA Flood Inundation Mapping from LiDAR source data, Geographic WGS84, (2016) [elev_557

Jason F Miller, P.E., US ARMY CORPS OF ENGINEERS, Supervisory Hydraulic Engineer 20170626 DRAFT *** Susquehanna River at Wilkes-Barre, PA Flood Inundation Mapping from LiDAR source data, Geographic WGS84, (2016) [elev_557_4] *** DRAFT raster digital data This layer was created as part of a Flood Inundation Map Library developed for display within the NOAA National Weather Service's Advanced Hydrologic Prediction Services (AHPS). This data represents the potential flood extent for an elevation of 520.9 to 557.4 feet as recorded at the Susquehanna River at Wilkes-Barre (Wilkes-Barre, PA; USGS ID 01536500) streamgage for the Susquehanna River. This data is part of a series of inundation layers meant to correlate observations and forecasts from the river gages with a visual representation of the areas impacted by high water. The dataset of flood inundation areas was created from flood scenarios generated by HEC-RAS runs and LiDAR data obtained from the USGS which was processed to extract bare earth points. A shapefile of inundation areas for each stage was created and subsequently merged to form continuous datasets for the main-stem Susquehanna River. This data was developed to assist the public and emergency officials with planning and response to high water episodes at or near a defined National Weather Service river forecast point. Created riverine flood inundation areas for floods ranging from an elevation of 520.9 to 557.4 feet NAVD88 as recorded at Wilkes-Barre, PA (Susquehanna River at Wilkes-Barre; USGS ID 01536500) for the main-stem Susquehanna River. In work As needed -76.508925 -76.206068 41.063095 40.945650 PA river inundation mapping Susquehanna River geospatial analysis Wilkes-Barre flooded area high-water marks flood forecasts inundation areas flood inundation areas gage tributary inlandWaters, elevation None Inundated areas shown are not to be used for navigation, regulatory, permitting, or other legal purposes. The Susquehanna River Flood Inundation Mapping Team 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. USACE, USACE-Philadelphia District (CENAP), USACE Institute of Water Resources, Hydrologic Engineering Center (CEIWR-HEC), USGS, NWS, FEMA, Esri Esri ArcGIS 10.4.1.5686 Vector Simple FALSE 0 FALSE TRUE 8.983152841195215e-009 8.983152841195215e-009 Decimal Degrees D WGS 1984 WGS 1984 6378137.0 298.257223563 elev_466_4 Feature Class 0 FID FID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Shape Geometry 0 0 0 KEEP Keep Integer 5 5 0 Join_Count Join_Count Integer 10 10 0 TARGET_FID TARGET_FID Integer 10 10 0 ORIG_FID ORIG_FID Integer 10 10 0 Depth Depth Single 13 0 0 Shape_Leng Shape_Leng Double 19 0 0 Shape_Area Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. Shape_Area Double 19 0 0 Each entity corresponds to an estimated flood extent area for stream elevations 520.9 feet - 557.4 feet at the USGS streamgage 01536500, Susquehanna River at Wilkes-Barre, PA. The attributes represent the USGS station ID, USGS stage height associated with the area, and NAVD88 elevation that correlates with the stage NWS, USGS, USACE, 2016, Flood-inundation maps for the Susquehanna River at Wilkes-Barre 20170630 US Army Corps of Engineers - Phila. District Stephen W Long GIS Analyst mailing and physical

Wanamaker Building, 100 Penn Sq. East

Phialdelphia PA 19107-3390 US 215-656-6552 stephen.w.long@usace.army.mil FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time Stephen W Long US Army Corps of Engineers - Phila. District GIS Analyst 215-656-6552 Wanamaker Building, 100 Penn Sq. East Phialdelphia PA 19107-3390 US stephen.w.long@usace.army.mil 20170630 ArcGIS Metadata 1.0 Susquehanna River at Wilkes-Barre, PA Flood Inundation Mapping from LiDAR source data, Geographic WGS84, (2016) [elev_557_4] 2017-06-26 Jason F Miller, P.E., US ARMY CORPS OF ENGINEERS, Supervisory Hydraulic Engineer SIM 1 <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer was created as part of a Flood Inundation Map Library developed for display within the NOAA National Weather Service's Advanced Hydrologic Prediction Services (AHPS). This data represents the potential flood extent for an elevation of 520.9 to 557.4 feet as recorded at the Susquehanna River at Wilkes-Barre (Wilkes-Barre, PA; USGS ID 01536500) streamgage for the Susquehanna River. This data is part of a series of inundation layers meant to correlate observations and forecasts from the river gages with a visual representation of the areas impacted by high water. The dataset of flood inundation areas was created from flood scenarios generated by HEC-RAS runs and LiDAR data obtained from the USGS which was processed to extract bare earth points. A shapefile of flood inundation areas for each stage was created and subsequently merged to form continuous datasets for the main-stem Susquehanna River. This data was developed to assist the public and emergency officials with planning and response to high water episodes at or near a defined National Weather Service river forecast point.</SPAN></P></DIV></DIV></DIV> Created riverine flood inundation areas for floods ranging from an elevation of 520.9 to 557.4 feet NAVD88 as recorded at Wilkes-Barre, PA (Susquehanna River at Wilkes-Barre; USGS ID 01536500) for the main-stem Susquehanna River. USACE, USACE-Philadelphia District (CENAP), USACE Institute of Water Resources, Hydrologic Engineering Center (CEIWR-HEC), USGS, NWS, FEMA, Esri PA river inundation mapping Susquehanna River geospatial analysis Wilkes-Barre flooded area high-water marks flood forecasts inundation areas flood inundation areas gage tributary inundation mapping Susquehanna River geospatial analysis Wilkes-Barre flooded area high-water marks flood forecasts inundation areas gage tributary <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Inundated areas shown are not to be used for navigation, regulatory, permitting, or other legal purposes. The Susquehanna River Flood Inundation Mapping Team 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.</SPAN></P></DIV></DIV></DIV> Esri ArcGIS 10.4.1.5686 -76.508925 -76.206068 40.94565 41.063095 0.000000 0.000000 Jason F Miller, P.E. 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their lowest portion not impacted by water and considered to remain usable. USGS LiDAR elevation data were used as the source to determine flood inundation level estimated by the HEC-RAS model. Hydraulically disconnected areas (polygons) were removed. Inundation areas are complete for each flood level. The shapefile includes inundation polygons between the upstream limit of study at the Luzerne/Wyoming County border to the downstream limit of study, just downstream of the Market Street bridge in Nescopeck. The Bare Earth Digital Elevation Model (DEM) used to generate all mapping products was produced by the USGS and consists of a raster digital elevation model with a horizontal ground resolution of 6.4-feet. The model was constructed from LiDAR (Light Detection and Ranging) elevation points. First, the Bare Earth DEM was used to cut cross-section data which was done in the HEC-GeoRAS environment. HEC-GeoRAS is a set of ArcGIS tools specifically designed to process geospatial data for use with HEC-RAS. HEC GeoRAS first serves as a pre-processor which feeds elevation data to HEC-RAS. The hydraulic modeling is completed using HEC-RAS and once the output is considered satisfactory to the engineer, the results are exported from HEC-RAS to HEC-GeoRAS, which is then used as a post-processor in order to visualize the results in the GIS environment. The HEC-RAS output file contained 28 modeled flood profiles from elevation 520.9-feet through elevation 557.4-feet as measured at the USGS Gage ID Number 01536500 (Susquehanna River at Wilkes-Barre, PA). The 28 modeled flood profiles were exported to the GIS environment using HEC-GeoRAS. All GIS data developed during HEC-GeoRAS post-processing is based on the content of the HEC-RAS GIS Export File and the Bare Earth DEM. The HEC-RAS GIS Export File contains GIS coordinate-based information that describe the modeling cross-section locations and the resulting water surface elevations at each modeling cross-section. The Export File is first read into the GIS. The next step is to create water surface TINs for each of the 28 modeled flood profiles. The TIN created is based on the water surface elevation at each cross-section. The water surface TIN is created without considering the Bare Earth DEM. The next step is to delineate a flood plain for each water surface TIN. A floodplain polygon is created based on the corresponding water surface TIN. Each floodplain polygon results from intersecting the water surface TIN with the Bare Earth DEM. The water surface TIN is converted to a grid and compared to the Bare Earth DEM. A depth grid is then created with values where the water surface grid is higher than the Bare Earth DEM. The depth grid is clipped by the bounding polygon to remove any areas outside the hydraulic model. The depth grid is then converted into a floodplain polygon feature class. This process resulted in the Main Stem floodplain polygon and Main Stem depth grids. Prior to finalizing the data, the depth grids and floodplain polygons needed to be reviewed and edited. The review and editing process consisted of general smoothing and clean-up plus these major steps: remove any disconnected water bodies, bridge clips. Step 1 involved checking all hydraulically disconnected wet areas. If there was evidence that a wet disconnected pond was hydraulically connected (i.e. an underground pipe connects the Main Stem Susquehanna River flooding to the disconnected pond), no action was taken. If there was no evidence of a hydraulic connection, the disconnected pond was removed. Step 2 involved making the depth grids and floodplain polygons as accurate as possible by clipping bridges if they were still usable during a flood event. A clipped bridge means it is not shown as flooded and will remain usable. For Main Stem Susquehanna River bridges, a bridge was clipped (and shown as being usable) as long as the lowest portion of the bridge was not impacted by water. Once the lowest portion of the bridge was impacted, all subsequent and higher elevation flood profiles would not be clipped. For the non-main stem bridges, if the top elevation of the bridge was not flooded, the bridge was clipped and shown to be usable for that flood profile. Once the top elevation of the bridge was impacted by water, all subsequent and higher elevation flood profiles would not be clipped. Once the review and editing process was complete, the depth grids and floodplain polygons were renamed and projected to their final format. 24000 Susquehanna River Flood Inundation Mapping inundation areas 2016-03-31T00:00:00 The approximate dates when the source data was collected and processed 2015-03-31T00:00:00 2016-03-31T00:00:00 False 0 Shapefile 0.000 dataset EPSG 6.14(3.0.1)