Statewide 100-year Floodplain Polygons for West Virginia

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: West Virginia GIS Technical Center
Publication_Date: 20130410
Title: Statewide 100-year Floodplain Polygons for West Virginia
Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
Publication_Information:
Publication_Place: Morgantown, WV
Publisher: West Virginia GIS Technical Center
Online_Linkage: <http://wvgis.wvu.edu/data/dataset.php?ID=373>
Online_Linkage: <http://www.wvgis.wvu.edu>
Description:
Abstract:
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:
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:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20130410
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -82.64474294
East_Bounding_Coordinate: -77.725291015
North_Bounding_Coordinate: 40.638810501
South_Bounding_Coordinate: 37.206718893
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Theme:
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:
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
Theme:
Theme_Keyword_Thesaurus: EPA GIS Keyword Thesaurus
Theme_Keyword: Disaster
Theme_Keyword: Emergency
Theme_Keyword: Hazards
Theme_Keyword: Risk
Theme_Keyword: Surface Water
Theme_Keyword: Water
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: West Virginia
Access_Constraints: None
Use_Constraints:
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:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Hopkins
Contact_Organization: West Virginia GIS Technical Center
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing
Address: West Virginia University
Address: Department of Geology and Geography
City: Morgantown
State_or_Province: West Virginia
Postal_Code: 26506
Contact_Voice_Telephone: (304) 293-9463
Contact_Electronic_Mail_Address: ehopkins@wvu.edu
Data_Set_Credit: West Virginia GIS Technical Center
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.1 (Build 3035) Service Pack 1 (Build 3143)
Cross_Reference:
Citation_Information:
Originator: Federal Emergency Management Agency (FEMA)
Publication_Date: 20121231
Title: Effective Countywide DFIRMs for West Virginia
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
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:
Citation_Information:
Originator: Federal Emergency Management Agency (FEMA)
Publication_Date: 1988
Title: Digital Q3 Flood Data
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Washington, DC, USA
Publisher: Federal Emergency Management Agency (FEMA)
Online_Linkage: <http://www.fema.gov/hazard/map/q3.shtm>
Cross_Reference:
Citation_Information:
Originator:
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:
<ftp://ftp.wvgis.wvu.edu/pub/Clearinghouse/water_resources/DFIRM-lite>
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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:
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:
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:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The DFIRM Databases used to compile this data set consist of countywide vector files and associated attributes produced in conjunction with the hardcopy 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 FISs and flood mapping process that produces these data are available in the Guidelines and Specifications for Flood Hazard Mapping Partners. Vertical accuracy of the countywide DFIRM databases 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:
Process_Step:
Process_Description:
Dataset compiled from Effective DFIRM, Draft DFIRM, and Q3 flood hazard polygon data
Process_Date: 2006
Process_Step:
Process_Description:
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
Process_Step:
Process_Description:
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
Process_Step:
Process_Description:
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. This will not be the case in counties where the DFIRM became effective before the new Approximate A Zone data was published.
Process_Date: 20100826
Process_Step:
Process_Description:
Incorporated new Effective and Preliminary DFIRM data for eight counties: Effective: Barbour, Doddridge, Nicholas, Pocahontas; Preliminary: Greenbrier, Roane, Webster, Wirt. Zone A, Zone AE, and Zone AO polygons were copied into the existing statewide data set.
Process_Date: 20120206
Process_Step:
Process_Description:
Incorporated new model-based Approximate A Zone (Advisory Flood Height) data from AMEC Earth and Environmental for eight counties into the new statewide floodplain data set: Fayette, Greenbrier, Kanawha, Logan, McDowell, Mercer, Raleigh, Wyoming. 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. This will not be the case in counties where the DFIRM became effective before the new Approximate A Zone data was published.
Process_Date: 20120206
Process_Step:
Process_Description:
Incorporated new Effective and Preliminary DFIRM data for seventeen counties: Effective: Greenbrier, Harrison, Marion, Mingo, Preston, Putnam, Ritchie, Roane, Taylor, Webster, Wirt; Preliminary: Boone, Clay, Lincoln, Mason, Pleasants, Wood. Zone A, Zone AE, and Zone AO polygons were copied into the existing statewide data set.
Process_Date: 20130228
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 2436
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name:
WGS 1984 Web Mercator Auxiliary Sphere (ESRI Full Name: WGS_1984_Web_Mercator_Auxiliary_Sphere)
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 1.0
Longitude_of_Central_Meridian: 0.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 0.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.6096
Ordinate_Resolution: 0.6096
Planar_Distance_Units: Meter
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The DFIRM Database is made up of several data themes containing both spatial and attribute information. These data together represent the current flood risk for the subject area as identified by FEMA. The attribute tables include SFHA locations, flood zone designations, BFEs, political entities, cross-section locations, FIRM panel information, and other data related to the NFIP.
Entity_and_Attribute_Detail_Citation:
West Virginia GIS Technical Center and FEMA Guidelines and Specifications for Digital Flood Mapping.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: West Virginia GIS Technical Center
Contact_Person: Eric Hopkins
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: WVU Dept. of Geology and Geography
Address: Brooks Hall rm 330
City: Morgantown
State_or_Province: WV
Postal_Code: 26506-6300
Contact_Voice_Telephone: (304) 293-9463
Contact_Electronic_Mail_Address: Eric.Hopkins@mail.wvu.edu
Resource_Description: Downloadable Data
Distribution_Liability:
Although these data have been processed successfully on a computer system at the West Virginia GIS Technical Center, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The West Virginia GIS Technical Center shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Vector Digital Data Set (Polygon)
Format_Version_Number: 1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://wvgis.wvu.edu/data/dataset.php?action=search&ID=373>
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20130422
Metadata_Future_Review_Date: 20140914
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: West Virginia GIS Technical Center
Contact_Person: Eric Hopkins
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: WVU Dept. of Geology and Geography
Address: Brooks Hall rm 330
City: Morgantown
State_or_Province: WV
Postal_Code: 26506-6300
Contact_Voice_Telephone: (304) 293-9463
Contact_Electronic_Mail_Address: Eric.Hopkins@mail.wvu.edu
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:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.2 on Mon Apr 29 14:01:50 2013