Statewide 100-year Floodplain Polygons for West Virginia
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Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: West Virginia GIS Technical Center
- Publication_Date: 20111101
- Title: Statewide 100-year Floodplain Polygons for West Virginia
- Geospatial_Data_Presentation_Form: vector digital data
- Online_Linkage: <http://wvgis.wvu.edu/data/dataset.php?action=search&ID=128>
- Description:
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- Abstract:
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The statewide 100-year floodplain polygon data set was first compiled in 2006 from the best flood data currently available from the Federal Emergency Management Agency (FEMA). Data sources for the current version include the National Flood Hazard Layer (NFHL), Effective DFIRM databases, Preliminary DFIRM databases and Q3 digital floodplain shapefiles.
- Purpose:
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This data set was developed primarily for use in the West Virginia GIS Technical Center's web-based Flood Tool, which enables users to estimate flood risk and the "in" or "out" status of specific properties or structures relative to areas (Flood Zones) of 1% annual chance flooding.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 20111101
- Currentness_Reference: publication date
- Status:
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- Progress: In work
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -82.698657
- East_Bounding_Coordinate: -77.676669
- North_Bounding_Coordinate: 40.452177
- South_Bounding_Coordinate: 37.165440
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: inlandWaters
- Theme:
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- Theme_Keyword_Thesaurus: FEMA NFIP Topic Category
- Theme_Keyword: FEMA Flood Hazard Zone
- Theme_Keyword: Special Flood Hazard Area
- Theme_Keyword: Riverine Flooding
- Theme_Keyword: Flood Insurance Rate Map
- Theme_Keyword: FIRM
- Theme_Keyword: DFIRM
- Theme_Keyword: Floodway
- Theme:
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- Theme_Keyword_Thesaurus: None
- Theme_Keyword: flooding
- Theme_Keyword: flood
- Theme_Keyword: floodplain
- Theme_Keyword: flood hazard determination tool
- Theme_Keyword: flood hazard determination map
- Theme_Keyword: advisory flood height
- Theme_Keyword: modeled approximate A zone
- Theme_Keyword: riverine flooding
- Theme_Keyword: flood hazard area
- Place:
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- Place_Keyword_Thesaurus: None
- Place_Keyword: West Virginia
- Access_Constraints: None
- Use_Constraints:
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This data is derived from effective, preliminary and draft FEMA flood data, but is not intended to replace official FEMA publications. Acknowledgement of FEMA and the West Virginia GIS Technical Center will be appreciated in presentations or publications that make use of this data.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Eric Hopkins
- Contact_Organization: West Virginia GIS Technical Center
- Contact_Position: GIS Specialist
- Contact_Address:
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- Address_Type: mailing
- Address: West Virginia University
- Address: Department of Geology and Geography
- Address: 330 Brooks Hall
- Address: PO Box 6300
- City: Morgantown
- State_or_Province: West Virginia
- Postal_Code: 26506
- Country: USA
- Contact_Voice_Telephone: (304) 293-9463
- Contact_Electronic_Mail_Address: ehopkins@wvu.edu
- Hours_of_Service: 9:00 A.M - 5:00 P.M.
- Data_Set_Credit: West Virginia GIS Technical Center
- Native_Data_Set_Environment: Microsoft Windows 7; ESRI ArcCatalog 10.0
- Cross_Reference:
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- Citation_Information:
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- Originator: Federal Emergency Management Agency (FEMA)
- Publication_Date: 2008
- Title: Effective Countywide DFIRMs for West Virginia
- Geospatial_Data_Presentation_Form: vector digital data
- Publication_Information:
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- Publication_Place: Washington, DC, USA
- Publisher: Federal Emergency Management Agency
- Other_Citation_Details: DFIRM dates are 2008 and earlier
- Online_Linkage: <http://msc.fema.gov>
- Cross_Reference:
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- Citation_Information:
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- Originator: Federal Emergency Management Agency (FEMA)
- Publication_Date: 1988
- Title: Digital Q3 Flood Data
- Geospatial_Data_Presentation_Form: vector digital data
- Publication_Information:
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- Publication_Place: Washington, DC, USA
- Publisher: Federal Emergency Management Agency (FEMA)
- Online_Linkage: <http://www.fema.gov/hazard/map/q3.shtm>
- Cross_Reference:
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- Citation_Information:
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- Originator:
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FEMA Cooperating Technical Partners (CTPs), Flood mapping contractors
- Publication_Date: Unpublished Material
- Title: Draft DFIRM Data
- Geospatial_Data_Presentation_Form: vector digital data
- Online_Linkage:
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<ftp://ftp.wvgis.wvu.edu/pub/Clearinghouse/water_resources/DFIRM-lite>
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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The DFIRM Database consists of countywide vector files and associated attributes produced in conjunction with the hard copy FEMA FIRM. The published effective FIRM and DFIRM maps are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the Flood Insurance Studies (FISs) and flood mapping process that produces these data are available in the Guidelines and Specifications for Flood Hazard Mapping Partners. Attribute accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic System. Independent quality control testing of FEMA's DFIRM databases was also performed. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, users are encouraged to consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables contained within the FIS reports that accompany the Effective DFIRM databases. Users should be aware that BFEs shown in the S_BFE table represent rounded whole-foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report must be used in conjunction with the FIRM for purposes of construction and/or floodplain management. The 1-percent-annual-chance water-surface elevations shown in theDFIRM database S_XS table match the regulatory elevations shown in the FIS report. This data set does not include cross section (XS) or BFE information.
- Logical_Consistency_Report:
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The floodplains depicted in this data have been compared to the NFHL, Effective DFIRM, Preliminary DFIRM or Q3 source material to check for alignment errors or omissions. Effective DFIRMs, including the NFHL, which is compiled from Effective DFIRM data, have been subjected, during production and after delivery, to more thorough analysis and checking for spatial agreement of features.
- Completeness_Report:
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Data contained in the DFIRM Database files reflect the content of the source materials. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. With new mapping, FEMA plans to maintain full detail in the spatial data it produces. However, older information is often transferred from existing maps where some generalization has taken place. Flood risk data are developed for communities participating in the National Flood Insurance Program (NFIP) for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analyses of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities; floodplain topographic surveys; and hydrological and hydraulic analysis. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Horizontal accuracy of Effective DFIRM data was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of FEMA's DFIRM database was also performed.
- Lineage:
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- Process_Step:
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- Process_Description:
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Dataset compiled from Effective DFIRM, Draft DFIRM, and Q3 flood hazard polygon data
- Process_Date: 2006
- Source_Used_Citation_Abbreviation: DFIRM, Draft, Q3
- Process_Step:
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- Process_Description:
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Incorporated new Effective DFIRM and Draft DFIRM data. Zone A, Zone AE, and Zone AO polygons were copied into the existing statewide data set.
- Process_Date: 200807
- Source_Used_Citation_Abbreviation: DFIRM, Draft DFIRM, Q3
- Process_Step:
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- Process_Description:
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Incorporated new Effective and Preliminary DFIRM data. Zone A, Zone AE, and Zone AO polygons were copied into the existing statewide data set.
- Process_Date: 20100826
- Source_Used_Citation_Abbreviation: DFIRM, Preliminary DFIRM, Draft DFIRM, Q3
- Process_Step:
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- Process_Description:
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Incorporated new model-based Approximate A Zone (Advisory Flood Height) data from AMEC Earth and Environmental for five counties into the new statewide floodplain data set: Marion, Harrison, Mineral, Mingo and Wayne. The floodplain polygons in these five counties match the water surface and depth grid raster data provided by AMEC and incorporated into the WV Flood Hazard Determination Tool.
- Process_Date: 2010826
- Source_Used_Citation_Abbreviation:
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modeled Approximate A Zone, Advisory Flood Height (AFH)
Note that we need to add source elements that describe the items listed above under Source_Used_Citation.
- 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: 2052
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Grid_Coordinate_System:
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- Grid_Coordinate_System_Name: Universal Transverse Mercator
- Universal_Transverse_Mercator:
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- UTM_Zone_Number: 17
- Transverse_Mercator:
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- Scale_Factor_at_Central_Meridian: 0.999600
- Longitude_of_Central_Meridian: -81.000000
- Latitude_of_Projection_Origin: 0.000000
- False_Easting: 500000.000000
- False_Northing: 0.000000
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.001024
- Ordinate_Resolution: 0.001024
- Planar_Distance_Units: meters
- Geodetic_Model:
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- Horizontal_Datum_Name: North American Datum of 1983
- Ellipsoid_Name: Geodetic Reference System 80
- Semi-major_Axis: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.257222
- 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_Resolution: 1.000000
- Altitude_Distance_Units: feet
- Altitude_Encoding_Method:
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Explicit elevation coordinate included with horizontal coordinates
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: VECTUSR.femaAll5
- Entity_Type_Definition: Location and attributes for floodplain polygons
- Entity_Type_Definition_Source:
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FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Databases (available at <http://www.fema.gov/fhm/dl_cgs.shtm>)
- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: OBJECTID
- Entity_Type_Definition: Internal feature number
- Entity_Type_Definition_Source: ESRI
- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: ZONE
- Entity_Type_Definition: Special Flood Hazard Area (SFHA)
- Entity_Type_Definition_Source: DFIRM, Draft, Q3
- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: SHAPE
- Entity_Type_Definition: Feature geometry
- Entity_Type_Definition_Source: ESRI
- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: TYPE
- Entity_Type_Definition: Data source, i.e. Effective, Preliminary, Draft, Q3
- Entity_Type_Definition_Source: WVGISTC
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: West Virginia GIS Technical Center
- Contact_Person: Eric Hopkins
- Contact_Address:
-
- Address_Type: mailing
- Address: West Virginia University
- Address: Department of Geology and Geography
- Address: 330 Brooks Hall
- Address: PO Box 6300
- City: Morgantown
- State_or_Province: West Virginia
- Postal_Code: 26506
- Country: USA
- Contact_Voice_Telephone: (304) 293-9463
- Contact_Electronic_Mail_Address: ehopkins@wvu.edu
- Hours_of_Service: 9:00 A.M - 5:00 P.M.
- Contact_Instructions:
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The WVGISTC can assist with data download or data use issues. Specific data requests should be directed to FEMA via the Map Service Center (<http://msc.fema.gov>). Such requests must include the full name of the community or county and the FIRM panel number(s) or the 7.5- minute series quadrangle sheet area(s) covered by the request. FIRM panel numbers can be found by using the WV Flood Tool (<http://mapwv.gov/flood>).
- Distribution_Liability:
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No warranty expressed or implied is made by the West Virginia GIS Technical Center regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: ESRI Shapefile
- Format_Version_Number: 1
- Digital_Transfer_Option:
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- Online_Option:
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- Computer_Contact_Information:
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- Network_Address:
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- Network_Resource_Name: <http://wvgis.wvu.edu/data/dataset.php?action=search&ID=373>
- Fees: none
- Metadata_Reference_Information:
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- Metadata_Date: 20100914
- Metadata_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
-
- Contact_Organization: West Virginia GIS Technical Center
- Contact_Person: Eric Hopkins
- Contact_Address:
-
- Address_Type: mailing
- Address: West Virginia University
- Address: Department of Geology and Geography
- Address: 330 Brooks Hall
- Address: PO Box 6300
- City: Morgantown
- State_or_Province: West Virginia
- Postal_Code: 26506
- Country: USA
- Contact_Voice_Telephone: (304) 293-9463
- Contact_Electronic_Mail_Address: ehopkins@wvu.edu
- Hours_of_Service: 9:00 A.M - 5:00 P.M.
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Access_Constraints: none
- Metadata_Use_Constraints: none
- Metadata_Extensions:
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- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.2 on Tue Jan 10 16:01:54 2012