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1
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IDENTIFICATION INFORMATION
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1.1
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Citation
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Originator
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City of Portland
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Publication date
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1992
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Title
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FEMA Special Flood Hazard Area (100-year floodplain)
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1.2
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Description
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Abstract
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FEMA Special Flood Hazard Area (SFHA), which is also commonly referred to as the 100-year floodplain. Based on November 2010 FEMA maps, with subsequent "Letters of Map Revision" (LOMR) information incorporated as approved by FEMA.
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Purpose
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This is the floodplain to use for all regulatory and insurance purposes. From FEMA: The land area covered by the floodwaters of the base flood is the Special Flood Hazard Area (SFHA) on NFIP maps. The SFHA is the area where the NFIP's floodplain management regulations must be enforced and the area where the mandatory purchase of flood insurance applies. The SFHA includes Zones A, AO, AH, A1-30, AE, A99, AR, AR/A1-30, AR/AE, AR/AO, AR/AH, AR/A, VO, V1-30, VE, and V.
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Supplemental information
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Layer Files/Legends: 100yr Floodplain.lyr
More information about the SFHA can be found at: http://www.fema.gov/plan/prevent/floodplain/nfipkeywords/sfha.shtm
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1.3
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Time period of content
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Current
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Last Dataset Update Date
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2013-05-19 22:16:45.0
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1.4
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Status
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Progress
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Complete
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Maintenance/Update Frequency
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As needed
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1.5
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Spatial domain
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Description
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Clackamas County, Multnomah County, and Washington County, Oregon
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West bounding coordinate
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-123.47121656
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East bounding coordinate
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-121.65053671
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North bounding coordinate
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45.82618832
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South bounding coordinate
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44.85462409
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1.6
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Keywords
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Theme keyword thesaurus
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Theme keyword
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FEMA, SFHA, special flood hazard area, 100-year floodplain, regulation
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Place keyword thesaurus
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Place keyword
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Portland, Multnomah County, Washington County, Clackamas County, Oregon
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1.7
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Access Constraints
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None
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1.8
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Use Constraints
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These data are distributed under the terms of the City of Portland Data Distribution Policy. Care was taken in the creation of this data but it is provided "as is". The City of Portland cannot accept any responsibility for error, omissions, or positional accuracy.
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1.10
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Browse graphic
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Browse graphic file name
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Browse graphic file description
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Browse graphic file type
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1.13
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Native data set environment
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File geodatabase
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[Top of Page]
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2
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DATA QUALITY INFORMATION
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2.4
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Horizontal positional accuracy
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Registered to tax lots.
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[Top of Page]
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3
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SPATIAL DATA ORGANIZATION INFORMATION
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3.2
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Direct spatial reference method
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3.3
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Point and vector object information
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SDTS point and vector object type
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Polygon
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Point and vector object count
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192
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3.4
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Raster object information
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Raster object type
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NA
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Row count
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0
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Column count
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0
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[Top of Page]
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4
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SPATIAL REFERENCE INFORMATION
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4.1
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Horizontal Coordinate System
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Grid coordinate system name
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State plane coordinate system 1983(91).
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SPCS zone identifier
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5076
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Planar distance units
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International feet
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Horizontal datum name
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North American Datum of 1983/1991 (HPGN)
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[Top of Page]
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5
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ENTITY AND ATTRIBUTE INFORMATION
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5.2
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Overview description
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Related data files and field descriptions follow:
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Table Name
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Column Name
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Column Type
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Column Width
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Sample Domain Value
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Definition
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floodplain_100yr_pdx
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--
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--
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--
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--
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OBJECTID
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Integer
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4
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--
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A unique software ID for each polygon. May change when data is modified.
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FLOOD100
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Integer
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4
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--
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Binary flag identifying areas within the special flood hazard area (SFHA). Areas within the SFHA (100-year floodplain) receive a value of 1. Used for modeling purposes.
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SOURCE
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String
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60
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--
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The reference source of the floodplain.
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Aerial Photos
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Floodplain manually digitized where visible on 6"-resolution aerial photos.
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LIDAR DEM
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Floodplain based on visual interpretation of the 2004 through 2007 regional LiDAR data. The LiDAR points were used to generate a 3' digital elevation model and hillshade.
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LIDAR-Derived
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Floodplain automatically derived from 2004, 2005, and 2007 LiDAR elevation models using "feature extraction" techniques.
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LOMR
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Floodplain mapped based on FEMA-approved "letter of map revision" (LOMR) and supporting maps and documents.
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FEMA
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Floodplain mapped by FEMA (latest City of Portland mapping revision November 2010)
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Field Survey
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Floodplain was digitized using GPS data collected in a field visit, or delineated based on a formal survey.
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SOURCE_REF
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String
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30
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--
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Detailed information about the reference source, i.e., LOMR reference number, aerial year, etc.
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MODIFIER
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String
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15
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--
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Last organization to edit the floodplain polygon.
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BES
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City of Portland Bureau of Environmental Services
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BPS
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City of Portland Bureau of Planning & Sustainability
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Metro
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Metro
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MOD_NAME
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String
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15
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--
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Initials of the last person to edit the floodplain polygon
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MOD_DATE
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Date
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36
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--
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Date of last modification
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CREATED_BY
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String
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15
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--
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Name of the organization that originally created the floodplain polygon. Same domain as the "MODIFIER" attribute.
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CREATEDATE
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Date
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36
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--
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Date the floodplain polygon was originally created.
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FIELD_DATE
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Date
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36
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--
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Date of any field visit to the floodplain area.
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REVIEW
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String
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5
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--
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Indicates whether the floodplain polygon needs further review (i.e., the mapped location is approximate).
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NOTES
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String
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150
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--
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Any notes related to the floodplain polygon.
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SUBAREA
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String
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30
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--
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Regional agency responsible for the mapping of the floodplain.
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[Top of Page]
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6
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DISTRIBUTION INFORMATION
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6.1
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Distributor
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Contact organization
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Bureau of Planning and Sustainability
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Address
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1900 SW 4th Ave., suite 7100
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City
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Portland
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State or province
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Oregon
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Postal code
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97201
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Contact voice telephone
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503 823-7700
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Contact facsimile telephone
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503 823-7800
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Contact electronic mail address
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bps@portlandoregon.gov
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6.3
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Distribution liability
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The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied.
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Digital transfer information
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Format name
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Shapefile - Cost Recovery fee will be charged for conversion.
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Transfer size
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1Mb
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Digital transfer options:
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Online option
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Fees
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[Top of Page]
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7
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METADATA REFERENCE INFORMATION
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7.1
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Metadata date
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20130519
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7.4
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Metadata contact
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Contact person
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Kevin Martin
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Contact voice telephone
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503 823-7710
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Contact facsimile telephone
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503 823-7800
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Contact electronic mail address
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Kevin.Martin@portlandoregon.gov
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7.5
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Metadata standard name
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FGDC Content Standards for Digital Geospatial Metadata
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7.6
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Metadata standard version
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19940608
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