Development of Flood-Inundation Maps for the West Branch Susquehanna River near the Borough of Jersey Shore, Lycoming County, Pennsylvania: 01549760_23 (water surface)
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: US Geological Survey, Pennsylvania Water Science Center
- Publication_Date: June 2010
- Title:
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Development of Flood-Inundation Maps for the West Branch Susquehanna River near the Borough of Jersey Shore, Lycoming County, Pennsylvania: 01549760_23 (water surface)
- Edition: Version 1.0
- Geospatial_Data_Presentation_Form: vector digital data
- Series_Information:
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- Series_Name: Scientific Investigations Report
- Issue_Identification: SIR 2010-5057
- Publication_Information:
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- Publication_Place: New Cumberland, Pennsylvania
- Publisher: US Geological Survey, Pennsylvania Water Science Center
- Online_Linkage: <http://pa.water.usgs.gov>
- Larger_Work_Citation:
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- Citation_Information:
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- Originator: US Geological Survey, Pennsylvania Water Science Center
- Publication_Date: 2010
- Title:
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Development of Flood-Inundation Maps for the West Branch Susquehanna River near Jersey Shore Borough, Lycoming County, Pennsylvania
- Series_Information:
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- Series_Name: Scientific Investigations Report
- Issue_Identification: SIR 2010-5057
- Publication_Information:
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- Publication_Place: New Cumberland, Pennsylvania
- Publisher: USGS
- Online_Linkage: <http://pa.water.usgs.gov>
- Description:
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- Abstract:
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Stream flow data, water-surface elevation profiles, and GIS digital elevation models were used to develop a set of eight flood-inundation maps for an approximate 5-mile reach of the West Branch Susquehanna River near the Borough of Jersey Shore, Pa. The inundation maps were created as part of the National Weather Service (NWS) ongoing efforts to focus on continued improvements to the flood forecasting and warning abilities in the Susquehanna River basin, and to modernize their flood forecasting methodologies. The maps correspond to river stage at the USGS streamgaging station (01549760) at Jersey Shore, and were provided to the NWS for incorporation into a web-based flood warning system that can be used to identify areas of predicted flood inundation associated with forecasted flood-peak stages. During times of flooding or predicted flooding, these maps can be used by emergency managers and the public to take proactive steps to protect life and reduce property damage caused by floods.
- Purpose:
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Scientific Investigations Report SIR 2010-5057 describes the methods and results of hydrologic and hydraulic analyses relative to the development of flood inundation maps for selected water-surface elevations at the NWS flood forecast point on the West Branch Susquehanna River at Jersey Shore, Pa. The inundation maps were developed for an approximate 5 mile reach of the West Branch starting at the confluence of Pine Creek and ending at the confluence of Larrys Creek. Sixteen inundation maps were developed to estimate areas of anticipated flooding for water-surface elevations starting at flood stage and increasing in 1 foot increments up to 2 feet above the flood stage of record.
- Supplemental_Information:
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Continuity check between flood-level shapefiles performed by Russ Ludlow, USGS, New Cumberland, Pennsylvania. Thorough dataset review by Ray Davis (NWS).
- Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: June 2010
- Currentness_Reference: publication date
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.275639
- East_Bounding_Coordinate: -77.217442
- North_Bounding_Coordinate: 41.219473
- South_Bounding_Coordinate: 41.169528
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: FEMA Flood Map Modernization Guidelines
- Theme_Keyword: flood plain mapping
- Theme_Keyword: floodway
- Theme_Keyword: inundation area
- Theme_Keyword: flood level
- Theme_Keyword: gage height
- Theme_Keyword: HEC2 hydraulic model
- Place:
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- Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
- Place_Keyword: Jersey Shore Borough
- Place_Keyword: Lycoming County
- Place_Keyword: Pennsylvania
- Place_Keyword: West Branch Susquehanna River
- Place_Keyword: Pine Creek
- Place_Keyword: Larrys Creek
- Place_Keyword: Long Island
- Access_Constraints: None.
- Use_Constraints:
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Data can be used by a Geographic Information System (GIS) or image-processing software.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Scott Hoffman
- Contact_Organization: US Geological Survey, Pennsylvania Water Science Center
- Contact_Position: GIS Specialist
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 215 Limekiln Road
- City: New Cumberland
- State_or_Province: Pennsylvania
- Postal_Code: 17070
- Country: US
- Contact_Voice_Telephone: (717) 730-6945
- Contact_Voice_Telephone: (717) 730-6958
- Contact_Facsimile_Telephone: (717) 730-6997
- Contact_Electronic_Mail_Address: shoffman@usgs.gov
- Contact_Electronic_Mail_Address: mroland@usgs.gov
- Hours_of_Service: 8:00 AM to 4:30 PM
- Data_Set_Credit: U.S. Geological Survey, Pennsylvania Water Science Center
- Security_Information:
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- Security_Classification: Unclassified
- Native_Data_Set_Environment:
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Microsoft Windows Vista Version 6.1 (Build 7600) ; ESRI ArcCatalog 9.3.1.3000
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report: Attributes are accuarate as coded.
- Logical_Consistency_Report:
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Polygons intersecting the neatline are closed along the border. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in a data string. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment.
- Completeness_Report:
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PAMAP, LiDAR-based, elevation data were used as the foundation to determine each flood level estimated by the HEC-RAS hydrualic model. Areas of inundation (polygons) are complete for each flood level. Extraneous polygons were removed if they were determined to be artifacts from the GIS processing instead of true areas of inundation as determined by the hydraulic model.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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The horizontal accuracy standard follows the NSSDA-1998 standard. The maximum permissible RMSE for 95% of the horizontal check points for the mapping product is 5 feet or better.
- Vertical_Positional_Accuracy:
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- Vertical_Positional_Accuracy_Report:
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The vertical accuracy will meet the requirements of NSSDA at the 95% confidence interval (1.96 x RMSE).
- Lineage:
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- Source_Information:
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- Source_Scale_Denominator: 2400
- Type_of_Source_Media: online
- Source_Citation_Abbreviation:
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PAMAP Program, PA Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey
- Source_Contribution:
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PAMAP Program, consists of a raster digital elevation model with a horizontal ground resolution of 3.2 feet. The model was constructed from PAMAP LiDAR (Light Detection and Ranging) elevation points. PAMAP data are organized into blocks, which do not have gaps or overlaps, that represent 10,000 feet by 10,000 feet on the ground. General-purpose aerial topographic survey of the Commonwealth of Pennsylvania.
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator:
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PAMAP Program, PA Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey
- Publication_Date: 20061213
- Title: PAMAP Program 3.2 ft Digital Elevation Model of Pennsylvania
- Geospatial_Data_Presentation_Form: raster digital data
- Online_Linkage:
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<http://www.pasda.psu.edu/uci/FullMetadataDisplay.aspx?file=PAMAP_DEM.xml>
- Process_Step:
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- Process_Description:
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Mosaic 10,000' x 10,000' tiles of PAMAP, LiDAR-collected digital elevation model (DEM) data for the study area.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description: Clip mosaicked DEM data to the flood study area polygon.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Use FEMA digital data for flood cross sections and add an attribute to the feature attribute table for the HEC-RAS estimated flood elevation in NAVD88.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Use the TopoToRaster tool in ArcToolbox to calculate the water surface.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Use the Raster Calculator to subtract the water surface elevation from the DEM. This calculation generates a depth raster of water.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Use Single Output Map Algebra (SOMA) to select depth values less than zero (0) from the depth raster generated from the Raster Calculator
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Convert floating-point SOMA raster into an integer raster using the SOMA, INT function, and then generate inundation polygons using the RasterToPolygon tool in ArcToolbox.
- Process_Date: Spring 2009
- Process_Step:
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- Process_Description:
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Using the FEMA guideline to remove all polygons less than 250' in length, remove 'orphan' and 'donut' polygons.
- Process_Date: Fall 2009
- Process_Step:
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- Process_Description: Create metadata.
- Process_Date: Fall 2009
- Process_Step:
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- Process_Description:
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Update polygon data based on review by Ray Davis, National Weather Service (NWS), Cincinnati, Ohio.
- Process_Date: January 2011
- Process_Step:
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- Process_Description: Metadata updated.
- Process_Date: January 2011
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: G-polygon
- Point_and_Vector_Object_Count: 9
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
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- Map_Projection_Name: Mercator_Auxiliary_Sphere
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.000000
- Ordinate_Resolution: 0.000000
- Planar_Distance_Units: meters
- Geodetic_Model:
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- Horizontal_Datum_Name: D_WGS_1984
- Ellipsoid_Name: WGS_1984
- Semi-major_Axis: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.257224
- Vertical_Coordinate_System_Definition:
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- Altitude_System_Definition:
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- Altitude_Datum_Name: North American Vertical Datum of 1988
- Altitude_Distance_Units: feet
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: 01549760_23
- Attribute:
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- Attribute_Label: FID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: ID
- Attribute_Definition: Internl ID number
- Attribute_Definition_Source: ESRI
- Attribute:
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- Attribute_Label: STAGE
- Attribute_Definition: USGS stage height
- Attribute_Definition_Source: USGS, PaWSC
- Attribute:
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- Attribute_Label: ELEV
- Attribute_Definition: NAVD88 elevation that correlates with the stage
- Attribute_Definition_Source: USGS, PaWSC
- Attribute:
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- Attribute_Label: USGSID
- Attribute_Definition: USGS station ID number
- Attribute_Definition_Source: USGS, PaWSC
- Attribute:
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- Attribute_Label: GRIDID
- Attribute_Definition: Code to match the appropriate grid with the flood depths.
- Overview_Description:
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Scott Hoffman
- Contact_Organization: US Geological Survey
- Contact_Position: GIS Specialist
- Resource_Description: Downloadable Data
- Distribution_Liability:
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Although these data have been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy and validity of the data nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection herewith.
Disclaimer for Flood-Inundation Maps:
Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. 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.
Uncertainties and Limitations for Use of Flood-Inundation Maps:
Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood boundaries shown were estimated based on water stages and streamflows at selected USGS streamgages. Water-surface elevations along the stream reaches were estimated by steady-state hydraulic modeling, assuming unobstructed flow, and using streamflows and hydrologic conditions anticipated at the USGS streamgage(s). The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of March 2009. Unique meteorological factors (timing and distribution of precipitation) may cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to unanticipated conditions such as: changes in the streambed elevation or roughness, backwater into major tributaries along a main stem river, or backwater from localized debris or ice jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate the land surface. Additional uncertainties and limitations pertinent to this study may be described elsewhere in this report.
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 that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing through selected stream reaches in the United States. These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (water-surface elevation) for the stream at a given location (AHPS forecast point) throughout the forecast period (every 6 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>.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Transfer_Size: 0.667
- Technical_Prerequisites:
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This dataset can be used by Geographic Information System (GIS) or image-processing software.
- Metadata_Reference_Information:
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- Metadata_Date: 20120503
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: US Geological Survey, Pennsylvania Water Science Center
- Contact_Person: Scott Hoffman
- Contact_Position: GIS Specialist
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 215 Limekiln Road
- City: New Cumberland
- State_or_Province: Pennsylvania
- Postal_Code: 17070
- Country: US
- Contact_Voice_Telephone: (717) 730-6945
- Contact_Electronic_Mail_Address: shoffman@usgs.gov
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Extensions:
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- Online_Linkage: <http://pa.water.usgs.gov>
- Profile_Name: Metadata_elevation_23
- Metadata_Extensions:
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- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.6 on Thu May 03 09:17:42 2012