Humboldt County Modified FEMA Q3 Flood Zones and Floodways

Data format: Shapefile

File or table name: floodsp4

Coordinate system: State Plane Coordinate System 1927

Theme keywords: Humboldt County, Hazards, Floodplain, Flood Zones

Abstract: Modified* FEMA Digital Q3 Flood data merged with Floodway. Shows floodplain areas for 100 (Zone=A) and 500 Zone=B) year floods. These maps blank out federal and state owned lands so the flood hazard in (for instance) State or National Parks is not properly represented. Also depicts Floodway areas. The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the geographic projection and the decimal degree coordinate system. The specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000. * Data has been modified by Humboldt County to better match other base datasets. See Supplemental Information.

FGDC and ESRI Metadata:

Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.

Identification Information:


Citation:
Citation information:
Originators: Humboldt County Community Development Services, FEMA - http://msc.fema.gov/q3users.shtml


Title:
Humboldt County Modified FEMA Q3 Flood Zones and Floodways
*File or table name: floodsp4


Publication date: Unpublished Material
Publication time: 2004
*Geospatial data presentation form: vector digital data


Other citation details:
Q: What are the uses of the digital Q3 Flood Data? A: The digital Q3 Flood Data product was designed to: 1) serve the needs of FEMA's Response and Recovery activities 2) promote flood insurance policy marketing initiatives 3) assist in floodplain management activities at the local level The digital Q3 Flood Data are designed to serve FEMA's needs for disaster response activities, National Flood Insurance Program activities, risk assessment, and floodplain management. The data are expected to be used for a variety of planning applications including broad-based review for floodplain management, land-use planning, commercial siting analysis, insurance target marketing, natural resource/environmental analyses, and real estate development and targeting.


*Online linkage: \\Snap550020\SNAPGIS\GIS1\hazards\flood\floodsp4.shp


Description:
Abstract:
Modified* FEMA Digital Q3 Flood data merged with Floodway.  
Shows floodplain areas for 100 (Zone=A) and 500 Zone=B) year floods.  These maps blank out 
federal and state owned lands so the flood hazard in (for instance) State 
or National Parks is not properly represented.  Also depicts Floodway areas.
The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA).  The file is georeferenced to the earth's surface using the geographic projection and the decimal degree coordinate system.  The specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000.  *  Data has been modified by Humboldt County to better match  other base datasets.  See Supplemental Information.

Purpose:
The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). Insurance applications include enforcement of the mandatory purchase requirement of the Act which "... requires the purchase of flood insurance by property owners who are being assisted by Federal programs or by Federally supervised, regulated or insured agencies or institutions in the acquisition or improvement of land facilities located or to be located in identified areas having special flood hazards" (Section 2 (b) (4) of the 1973 Flood Disaster Protection Act). In addition to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown on the FIRMs are the basis for the establishment of premium rates for flood insurance coverage offered through the NFIP. Q3 Flood Data files are intended to convey certain features from the existing hard copy FIRM to provide users with automated flood risk data. Edge-matching errors, overlaps and deficiencies in coverages, and similar problems are not corrected during digitizing or post-processing. These data may be used to locate SFHAs. More detailed information may be obtained from the paper FIRM.

Supplemental information:
FEMA Digital Q3 Flood data merged with Floodway.  
Shows floodplain areas for 100 (Zone=A) and 500 Zone=B) year floods 
as identified by Flood Insurance Rate (FIRM) maps.  These maps blank out 
federal and state owned lands so the flood hazard in (for instance) State 
or National Parks is not properly represented.  Also depicts Floodway areas.

Updates/History/Corrections: 
Edited September, 2001: Redwood and Prairie Creeks have been corrected 
using USGS Digital Orthophoto Quarter Quads

Edited March, 2002, to correct alignment problems, particularly along 
the coast. Alderpoint, Briceland and Blue Lake areas also edited.	
	
March 2006: Added Floodway Zones: Floodways are high velocity areas within the flood plains 
where generally no structures are permitted. Digitized by Eric Zoellner, 
Humboldt County Planing Div., from FEMA hardcopy Floodway maps. City, 
state and Federal jurisdictions blanked out. Primarily for planning 
purposes. For regulatory purposes, use hardcopy maps. 
Added Floodway "Yes" for attribute floodway so that it can be identified. Updated Firm_panel attribute to incorporate FEMA map panels associated with Floodway.

*Language of dataset: en


Time period of content:
Time period information:
Single date/time:
Calendar date: 1998

Currentness reference:
publication date

Status:
Progress: Complete
Maintenance and update frequency: Unknown

Spatial domain:
Bounding coordinates:
*West bounding coordinate: -124.445595
*East bounding coordinate: -123.383801
*North bounding coordinate: 41.474417
*South bounding coordinate: 39.988026

Local bounding coordinates:
*Left bounding coordinate: 1329721.347753
*Right bounding coordinate: 1612343.250000
*Top bounding coordinate: 783122.750000
*Bottom bounding coordinate: 247653.265625

Keywords:
Theme:
Theme keywords: Humboldt County, Hazards, Floodplain, Flood Zones
Theme keyword thesaurus: REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

Place:
Place keywords: Humboldt

Access constraints: None
Use constraints:
Not suitable for regulatory use due to spatial inaccuracies and mismatches with basemap data.  Should be used for planning purposes only.

Humboldt County Community Development Services (HCCDS) makes no guarantee of the accuracy or completeness of this data set.  It has not been fully reviewed for accuracy and is intended to be used for planning purposes only.  HCCDS assumes no liability or responsibility in the use of this data.

Point of contact:
Contact information:
Contact person primary:
Contact person: Chinmaya Lewis
Contact organization: Humboldt County Community Development Services - Advance Planning Division.
Contact position: Planner I/GIS Analyst


Contact address:
Address type: mailing and physical address
Address:
3015 H Street
City: Eureka
State or province: CA
Postal code: 95501

Contact voice telephone: 707-268-3737
Contact facsimile telephone: 707-445-7446


Contact electronic mail address: clewis@co.humboldt.ca.us


Hours of service: M-F 8:30am - 5pm
Contact instructions:
Prefer to be contacted via e-mail.  Please include your contact information.
http://co.humboldt.ca.us/planning/maps

Data set credit:
http://msc.fema.gov/q3users.shtml

*Native dataset format: Shapefile
*Native data set environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780


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Data Quality Information:


Positional accuracy:
Horizontal positional accuracy:
Horizontal positional accuracy report:
Warning/Data Limitations: Not suitable for regulatory use due to spatial inaccuracies and mismatches with basemap data.  Should be used for planning purposes only.

Quantitative horizontal positional accuracy assessment:
Horizontal positional accuracy explanation:
Q: What are the limitations of the digital Q3 Flood Data? 
A: The digital Q3 Flood Data are designed to provide guidance and a general proximity of the location of Special Flood Hazard Areas. The digital Q3 Flood Data cannot be used to determine absolute delineation of flood risk boundaries, but instead should be seen as portraying zones of uncertainty and possible risks associated with flood inundation. Users must apply considerable care and judgment in the application of this product. Users of the digital Q3 Flood Data should refer to the "Users Guide" and "Specifications" for further information.

Lineage:
Source information:
Source contribution:
Q: What are the limitations of the digital Q3 Flood Data? 
A: The digital Q3 Flood Data are designed to provide guidance and a general proximity of the location of Special Flood Hazard Areas. The digital Q3 Flood Data cannot be used to determine absolute delineation of flood risk boundaries, but instead should be seen as portraying zones of uncertainty and possible risks associated with flood inundation. Users must apply considerable care and judgment in the application of this product. Users of the digital Q3 Flood Data should refer to the "Users Guide" and "Specifications" for further information.

Process step:
Process description:
Updates/History/Corrections: 
Edited September, 2001: Redwood and Prairie Creeks have been corrected 
using USGS Digital Orthophoto Quarter Quads
Edited March, 2002, to correct alignment problems, particularly along 
the coast. Alderpoint, Briceland and Blue Lake areas also edited.	
	
March 2006: Added Floodway Zones: Floodways are high velocity areas within the flood plains 
		where generally no structures are permitted. Digitized by Eric Zoellner, 
		Humboldt County Planing Div., from FEMA hardcopy Floodway maps. City, 
		state and Federal jurisdictions blanked out. Primarily for planning 
		purposes. For regulatory purposes, use hardcopy maps. 
		
	Added Floodway "Yes" for attribute floodway so that it can be identified. Updated Firm_panel attribute to incorporate FEMA map panel associated with Floodway,

Process step:
Process description:
Dataset copied.

Source used citation abbreviation:
H:\GIS1\hazards\flood\floodsp3


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Spatial Data Organization Information:


*Direct spatial reference method: Vector


Point and vector object information:
SDTS terms description:
*Name: floodsp4
*SDTS point and vector object type: G-polygon
*Point and vector object count: 852

ESRI terms description:
*Name: floodsp4
*ESRI feature type: Simple
*ESRI feature geometry: Polygon
*ESRI topology: FALSE
*ESRI feature count: 852
*Spatial index: TRUE
*Linear referencing: FALSE


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Spatial Reference Information:


Horizontal coordinate system definition:
Coordinate system name:
*Projected coordinate system name: NAD_1927_StatePlane_California_I_FIPS_0401
*Geographic coordinate system name: GCS_North_American_1927

Planar:
Grid coordinate system:
*Grid coordinate system name: State Plane Coordinate System 1927
State Plane Coordinate System:
*SPCS zone identifier: 401
Lambert conformal conic:
*Standard parallel: 40.000000
*Standard parallel: 41.666667
*Longitude of central meridian: -122.000000
*Latitude of projection origin: 39.333333
*False easting: 2000000.000000
*False northing: 0.000000

Planar coordinate information:
*Planar coordinate encoding method: coordinate pair
Coordinate representation:
*Abscissa resolution: 0.001024
*Ordinate resolution: 0.001024
*Planar distance units: survey feet

Geodetic model:
*Horizontal datum name: North American Datum of 1927
*Ellipsoid name: Clarke 1866
*Semi-major axis: 6378206.400000
*Denominator of flattening ratio: 294.978698

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Entity and Attribute Information:


Detailed description:
*Name: floodsp4


Entity type:
*Entity type label: floodsp4
*Entity type type: Feature Class
*Entity type count: 852

Attribute:
*Attribute label: FID
*Attribute alias: FID
*Attribute definition:
Internal feature number.
*Attribute definition source:
ESRI

*Attribute type: OID
*Attribute width: 4
*Attribute precision: 0
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Sequential unique whole numbers that are automatically generated.


Attribute:
*Attribute label: Shape
*Attribute alias: Shape
*Attribute definition:
Feature geometry.
*Attribute definition source:
ESRI

*Attribute type: Geometry
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Coordinates defining the features.


Attribute:
*Attribute label: AREA
*Attribute alias: AREA
Attribute definition:
Area in square feet

*Attribute type: Number
*Attribute width: 13
*Attribute number of decimals: 6


Attribute:
*Attribute label: PERIMETER
*Attribute alias: PERIMETER
Attribute definition:
Boundary Perimeter Length

*Attribute type: Number
*Attribute width: 13
*Attribute number of decimals: 6


Attribute:
*Attribute label: FLOODSPS_
*Attribute alias: FLOODSPS_


*Attribute type: Number
*Attribute width: 11


Attribute:
*Attribute label: FLOODSPS_I
*Attribute alias: FLOODSPS_I


*Attribute type: Number
*Attribute width: 11


Attribute:
*Attribute label: FIPS
*Attribute alias: FIPS


*Attribute type: String
*Attribute width: 5


Attribute:
*Attribute label: COMMUNITY
*Attribute alias: COMMUNITY
Attribute definition:
City Name

*Attribute type: String
*Attribute width: 4


Attribute:
*Attribute label: FIRM_PANEL
*Attribute alias: FIRM_PANEL
Attribute definition:
Boundary Type

*Attribute type: String
*Attribute width: 11


Attribute:
*Attribute label: QUAD
*Attribute alias: QUAD
Attribute definition:
Acres

*Attribute type: String
*Attribute width: 8


Attribute:
*Attribute label: ZONE
*Attribute alias: ZONE


*Attribute type: String
*Attribute width: 5


Attribute:
*Attribute label: FLOODWAY
*Attribute alias: FLOODWAY


*Attribute type: String
*Attribute width: 5


Attribute:
*Attribute label: COBRA
*Attribute alias: COBRA


*Attribute type: String
*Attribute width: 9


Attribute:
*Attribute label: SFHA
*Attribute alias: SFHA


*Attribute type: String
*Attribute width: 3


Attribute:
*Attribute label: SYMBOL
*Attribute alias: SYMBOL


*Attribute type: Number
*Attribute width: 11


Attribute:
*Attribute label: PANEL_TYP
*Attribute alias: PANEL_TYP


*Attribute type: String
*Attribute width: 4


Attribute:
*Attribute label: ACRES
*Attribute alias: ACRES


*Attribute type: Number
*Attribute width: 16
*Attribute number of decimals: 2


Attribute:
*Attribute label: CASE_NO_
*Attribute alias: CASE_NO_


*Attribute type: String
*Attribute width: 16


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Distribution Information:


Distributor:
Contact information:
Contact organization primary:
Contact organization: Humboldt County Community Development Services - Advance Planning Division.

Contact address:
Address:
http://co.humboldt.ca.us/planning/maps

Contact voice telephone: 707-268-3737


Contact electronic mail address: clewis@co.humboldt.ca.us
Contact electronic mail address: thofweber@co.humboldt.ca.us


Hours of service: M-F 8:30am - 5pm
Contact instructions:
Prefer contact via e-mail.  Please include your name and other contact information.

Resource description: Available upon request


Distribution liability:
Humboldt County Community Development Services (HCCDS) makes no guarantee of the accuracy or completeness of this data set.  It has not been fully reviewed for accuracy and is intended to be used for planning purposes only.  HCCDS assumes no liability or responsibility in the use of this data.

Standard order process:
Digital form:
Digital transfer information:
*Transfer size: 1.443
*Dataset size: 1.443

Fees: Time and materials
Ordering instructions:
E-mail your request to contact with a brief description of what the data will be used for.  Be sure to include your name and other contact information.


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Metadata Reference Information:


*Metadata date: 20061228


*Language of metadata: en


Metadata contact:
Contact information:
Contact organization primary:
Contact person: Chinmaya Lewis or Tom Hofweber
Contact organization: Humboldt County Community Development Services - Advance Planning Division

Contact address:
Address type: REQUIRED: The mailing and/or physical address for the organization or individual.
Address:
http://co.humboldt.ca.us/planning/maps
City: REQUIRED: The city of the address.
State or province: REQUIRED: The state or province of the address.
Postal code: REQUIRED: The ZIP or other postal code of the address.

Contact voice telephone: REQUIRED: The telephone number by which individuals can speak to the organization or individual.


*Metadata standard name: FGDC Content Standards for Digital Geospatial Metadata
*Metadata standard version: FGDC-STD-001-1998
*Metadata time convention: local time


Metadata extensions:
*Online linkage: http://www.esri.com/metadata/esriprof80.html
*Profile name: ESRI Metadata Profile

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Binary Enclosures:


Thumbnail:
Enclosure type: Picture



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