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Frequently anticipated questions:

What does this data set describe?

FEMA DFIRM (Digital Flood Insurance Rate Map) floodplain effective December 18, 2012, created for Boulder County and all municipalities within under the direction of the FEMA Map Modernization project. This data supercedes all other flood data.Per FEMA: Data included on this CD-ROM represents Final Flood Insurance Rate Map (FIRM) data that has been published as effective FIRM or DFIRM information. The data are the official and legal representation of the effective flood zones.
  1. How should this data set be cited?


  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -105.695353
    East_Bounding_Coordinate: -104.976726
    North_Bounding_Coordinate: 40.264169
    South_Bounding_Coordinate: 39.907753

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (2566)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Colorado North FIPS 0501.

      Projection parameters:
      Standard_Parallel: 39.71666666666667
      Standard_Parallel: 40.78333333333333
      Longitude_of_Central_Meridian: -105.5
      Latitude_of_Projection_Origin: 39.33333333333334
      False_Easting: 3000000.000316083
      False_Northing: 999999.999996

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0003280833333333334
      Ordinates (y-coordinates) are specified to the nearest 0.0003280833333333334
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?


    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.


    Flood Zone. Specific definitions of the following zones can be found via an internet search on "FEMA Flood Zone Designations"
    Zones found in this dataset are: [A, AE, AH, AO (a.k.a. 100 year floodplain)], X (a.k.a. unshaded X) and 0.2 PCT ANNUAL CHANCE FLOOD HAZARD (a.k.a. shaded X or the 500 year floodplain)

    High inundation zone within the 100 year floodplain boundary, derived by FEMA and Boulder County through various flood studies. The floodway is that area that must be kept open to convey flood waters downstream.












    FIRM Panel A local map within a county DFIRM that provides explicit flood detail pertinent to that area. Use the panel number when searching for flood maps on the FEMA Map Service Center website.

    Effective Date December 18, 2012



Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    FEMA (Federal Emergency Management Association), Boulder County Transportation

  3. To whom should users address questions about the data?

    Boulder County Transportation
    Attn: Justin Gindlesperger
    Certified Floodplain Manager

Why was the data set created?

FEMA DFIRM floodplain and floodway for Boulder County, incorporated and unincorporated.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
This data supercedes all previous flood data for Boulder County.
It is public information and open for all to use for display and analysis.
Effective December 18, 2012, all flood related decisions will be regulated based on this DFIRM.

Who wrote the metadata?

Last modified: 19-Dec-2012
Metadata author:
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Mon May 20 14:56:45 2013