Identification_Information: Citation: Citation_Information: Originator: AMEC Earth and Environmental, Inc. Publication_Date: 04232010 Title: FLOODPLAIN, MARION COUNTY, WEST VIRGINIA USA Geospatial_Data_Presentation_Form: FEMA-DCS-Hydraulics Publication_Information: Publication_Place: Washington, DC Publisher: Federal Emergency Management Agency Online_Linkage: http://hazards.fema.gov Larger_Work_Citation: Citation_Information: Originator: AMEC Earth and Environmental, Inc. Publication_Date: 04232010 Title: FEMA CASE MICS_12688 Description: Abstract: Recent developments in digital terrain and geospatial database management technology make it possible to protect this investment for existing and future projects to a much greater extent than was possible in the past. The minimum requirement for hydraulics data includes input and output files for all hydraulic models and spatial datasets that are needed to implement the models. (Source: FEMA Guidelines and Specs, Appendix N) Purpose: Development of a hydraulic model to provide water-surface elevations for floodplain mapping requires significant investment in time and resources to obtain and process topographic survey data including cross-section and bridge surveys. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 04232010 Currentness_Reference: FIRM Effective Date Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -80.51 East_Bounding_Coordinate: -79.92 North_Bounding_Coordinate: 39.65 South_Bounding_Coordinate: 39.38 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: environment Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: FEMA NFIP Topic Category Theme_Keyword: Hydraulics Theme_Keyword: Digital Flood Insurance Rate Map Theme_Keyword: DFIRM Theme_Keyword: Flood Hazard Data Theme_Keyword: 0.2-Percent-Annual-Chance Flood Theme_Keyword: 10-Percent-Annual-Chance Flood Theme_Keyword: 1-Percent-Annual-Chance Flood Theme_Keyword: 2-Percent-Annual-Chance Flood Theme_Keyword: Stream Theme_Keyword: Base Flood Elevation Theme_Keyword: Cross Section Theme_Keyword: Stream Centerlines Theme_Keyword: Profile Baseline Theme_Keyword: Backwater Theme_Keyword: Base Flood Elevation (BFE) Theme_Keyword: Elevation Reference Mark (ERM) Theme_Keyword: Elevation Reference Point (ERP) Theme_Keyword: Flood Profile Theme_Keyword: Floodway Data Table Theme_Keyword: Floodway Theme_Keyword: Cross-section Place: Place_Keyword_Thesaurus: None Place_Keyword: REGION 3 Place_Keyword: STATE WV Place_Keyword: COUNTY MARION Place_Keyword: COUNTY-FIPS 049 Place_Keyword: COMMUNITY MARION (and Incorporated Areas) Place_Keyword: FEMA-CID 540097 Access_Constraints: None Use_Constraints: Acknowledgement of FEMA would be appreciated in products derived from these data. This digital data is produced for the purposes of updating/creating a DFIRM database. Data_Quality_Information: Logical_Consistency_Report: Hydraulic analysis uses all valid existing flood elevation, survey, hydrologic analysis results and other pertinent information for the study area. FEMA approved models are used to compute water surface elevations for required flood events. Computed water surface elevations and topographic data are used to delineate flood hazard boundaries. Roughness coefficients are carefully selected to represent the conditions along stream beds and banks. Base Flood Elevations (BFEs) on the FIRMs and in floodway data tables agree with the flood profiles in the FIS. Completeness_Report: Hydraulic analysis provides water surface elevations at different locations along the stream and for different flooding events. Hydraulic submittal includes key physical data used in the process, model parameters and model input. Data developed in surveying and hydrologic analysis are incorporated in hydraulic analysis. Results of hydraulic analysis are used to map Special Flood Hazard Area (SFHA) boundaries. Selection of model parameters (e.g. roughness coefficients, expansion and contraction coefficients, etc) is supported by additional information (e.g. landuse, aerial photo, etc). Model boundary conditions are carefully selected and justified. Modeled velocities are checked for potential erosion. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 1.00 foot Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 0.50 foot Lineage: Source_Information: Source_Citation: Citation_Information: Originator: AMEC Earth and Environmental, Inc.Tech Publication_Date: 04232010 Title: FLOODPLAIN ANALYSIS MARION COUNTY, WEST VIRGINIA Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 04232010 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Other1 Source_Contribution: AMEC Earth and Environmental, Inc. performed basic hydrologic and hydraulic analysis. The objective was to determine whether several culverts and storm sewer networks constructed after the current effective FIS was issued, will contain the 1% annual chance (100-year) discharge. Floodplain mapping in these four areas is dependent on the results of the culvert and storm sewer capacity analysis. Process_Step: Process_Description: For all streams studied by approximate methods, GIS-based automated hydraulic methodologies were employed. These streams are supported by geo-referenced HEC-RAS models. While hydraulic structures were not incorporated into the models, cross sections were automatically generated and manually adjusted, where applicable, to capture areas of hydraulic contraction. Process_Date: 04232010 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System 1983 State_Plane_Coordinate_System: SPCS_Zone_Identifier: 4701 Lambert_Conformal_Conic: Standard_Parallel: 39 Standard_Parallel: 40.25 Longitude_of_Central_Meridian: -79.5 Latitude_of_Projection_Origin: 38.5 False_Easting: 1968500.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000216 Ordinate_Resolution: 0.000216 Planar_Distance_Units: survey feet Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.000001 Altitude_Distance_Units: feet Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: d_grid Entity_Type_Definition: Flood Depth Grid Entity_Type_Definition_Source: Raster image representation of flood depths of studied streams Detailed_Description: Entity_Type: Entity_Type_Label: s_fld_haz_ar Entity_Type_Definition: Location and attributes for Floodplains, 100-year boundaries Entity_Type_Definition_Source: FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix N: Data Capture Standards and Data Capture Guidelines (available at http://www.fema.gov/fhm/dl_cgs.shtm) Detailed_Description: Entity_Type: Entity_Type_Label: ws_grid Entity_Type_Definition: Flood Water Surface Grid Entity_Type_Definition_Source: Raster image representation of flood heights of studied streams Overview_Description: Entity_and_Attribute_Overview: The Hydraulic submittal is made up of several data themes containing both spatial and attribute information. These data represent the extent of flooding and the water surface elevations for the subject area. The spatial data files and attribute tables include stream centerline, cross-sections, flood hazard boundaries, BFEs, flow, roughness coefficients, manmade structures and other data related to the NFIP. Entity_and_Attribute_Detail_Citation: Appendix N of FEMA Guidelines and Specifications for FEMA Flood Hazard Mapping Partners contains a detailed description of the data themes and references to other relevant information. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Federal Emergency Management Agency Contact_Address: Address_Type: mailing address Address: 500 C Street, S.W. City: Washington State_or_Province: District of Columbia Postal_Code: 20472 Country: USA Contact_Voice_Telephone: 1-877-336-2627 Contact_Electronic_Mail_Address: miphelp@mapmodteam.com Distribution_Liability: No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: FEMA-DCS-Survey Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://hazards.fema.gov Fees: Contact Distributor Metadata_Reference_Information: Metadata_Date: 04232010 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mr. Jon Janowicz Contact_Organization: FEMA, Region III Contact_Position: Project Officer Contact_Address: Address_Type: mailing address Address: 615 Chestnut Street City: Philadelphia State_or_Province: PA Postal_Code: 19106-4404 Country: USA Contact_Voice_Telephone: 1-215-931-5575 Contact_Electronic_Mail_Address: Jon.Janowicz@dhs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Extensions: Online_Linkage: http://hazards.fema.gov Online_Linkage: http://www.epsg.org Profile_Name: FEMA NFIP Metadata Content and Format Standard