Flood Boundaries for the 10-percent Annual Exceedance Probability Flood of the Winooski River in Waterbury, Vermont, 2014

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Frequently anticipated questions:


What does this data set describe?

Title:
Flood Boundaries for the 10-percent Annual Exceedance Probability Flood of the Winooski River in Waterbury, Vermont, 2014
Abstract:
Digital flood-boundary shapefile of the areal extent of flooding for the Winooski River corresponding to the 10-percent annual exceedance probability (AEP) flood (also referred to as the 10-year flood) was created by the U.S. Geological Survey (USGS) in cooperation with the Federal Emergency Management Agency (FEMA) for a 8.3-mile reach of the Winooski River from about 1,000 feet downstream of the Waterbury-Bolton town line upstream to about 2,000 feet upstream of the Waterbury-Middlesex town line.
  1. How should this data set be cited?

    Scott Olson, U.S. Geological Survey, 20150228, Flood Boundaries for the 10-percent Annual Exceedance Probability Flood of the Winooski River in Waterbury, Vermont, 2014: Scientific Investigations Report 2015-5077.

    Other_Citation_Details:
    Additional details regarding the shapefile and its development can be found in Olson, S.A., 2015, Flood maps for the Winooski River in Waterbury, Vermont, 2014: U.S. Geological Survey Scientific Investigations Report 2015-5077, xx p.
    This is part of the following larger work.

    U.S. Geological Survey, 20150331, Flood maps for the Winooski River in Waterbury, Vermont, 2014: U.S. Geological Survey Scientific Investigations Report 2015-5077.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -72.829635
    East_Bounding_Coordinate: -72.709819
    North_Bounding_Coordinate: 44.361165
    South_Bounding_Coordinate: 44.311143

  3. What does it look like?

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

    Calendar_Date: 04-Dec-2014
    Currentness_Reference: Generated in 2014

  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 (16)

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

      The map projection used is NAD 1983 StatePlane Vermont FIPS 4400 Feet.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9999642857142858
      Longitude_of_Central_Meridian: -72.5
      Latitude_of_Projection_Origin: 42.5
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0003280833333333333
      Ordinates (y-coordinates) are specified to the nearest 0.0003280833333333333
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983.
      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?

    flood10
    10-percent annual exceedance probability flood boundary (Source: Author)

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Id
    Internal number (Source: ESRI)

    Positive real numbers that are automatically generated.

    area
    Area of feature in square feet (Source: Author)

    Positive real numbers that are generated by the geometry calculator.

    Shape_Length
    Length of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Shape_Area
    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.


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?

    U.S. Geological Survey, New England Water Science Center, in cooperation with the Federal Emergency Management Agency (FEMA).

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


Why was the data set created?

The flood-boundary maps depict estimates of the areal extent of flooding for the Winooski River corresponding to the 10-percent annual exceedance probability flood. This shapefile will help to guide the general public in taking individual safety precautions and will provide city officials with a tool to efficiently manage emergency flood operations and flood mitigation efforts.


How was the data set created?

  1. From what previous works were the data drawn?

    LiDAR Chittenden Floodplain 2007 (source 1 of 1)
    Sanborn Map Company, Inc., 20070101, LiDAR Chittenden Floodplain 2007.

    Other_Citation_Details:
    The 8-foot DEM from lidar is the dominant elevation source for delineation of the AEP flood boundary.
    Type_of_Source_Media: None
    Source_Contribution: DEM from lidar data

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

    Date: 01-Aug-2014 (process 1 of 2)
    Flood-inundation modeling done using lidar DEM, surveyed elevation data, flow data, and high-water-mark data as input to the U.S. Army Corps of Engineers' HEC-GeoRas computer program (U.S. Army Corps of Engineers, 2009). See USGS SIR 2015-XXXX for more details.

    Date: 15-Aug-2014 (process 2 of 2)
    Shapefile format of flood-inundation extent was exported from HEC-GeoRas and brought into ESRI ArcGIS.

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


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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Complete for the intended 8.3-mile reach of the Winooski River in Waterbury, Vermont.

  5. How consistent are the relationships among the observations, including topology?

    A separate review of the modeled flood extents and elevations was conducted.


How can someone get a copy of the data set?

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

Access_Constraints: None
Use_Constraints:
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The flood boundaries shown were estimated using steady-state hydraulic modeling (assuming unobstructed flow) and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing July 2013. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water-surface elevations and boundaries shown here. Additional areas may be flooded owing to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The USGS provides these maps as a planning tool but assumes no legal liability or responsibility resulting from the use of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey
    Reston, Virginia

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The flood boundaries shown were estimated using steady-state hydraulic modeling (assuming unobstructed flow) and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing July 2013. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water-surface elevations and boundaries shown here. Additional areas may be flooded owing to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The USGS provides these maps as a planning tool but assumes no legal liability or responsibility resulting from the use of this information.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 02-Jun-2015
Metadata author:
U.S. Geological Survey
Attn: Scott Olson
331 Commerce Way
Pembroke, New Hampshire 03275
US

603-226-7800 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.16 on Tue Jun 02 10:26:29 2015