Regional Precipitation-Frequency Analysis and Spatial Mapping of 24-Hour Precipitation for Oregon [Report and Data files]
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Regional Precipitation-Frequency Analysis and Spatial Mapping of 24-Hour Precipitation for Oregon [Report and Data files]

Filetype[PDF-1.57 MB]


English
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Details:

  • Creators:
  • Corporate Creators:
    Oregon. Dept. of Transportation. Research Unit
  • Subject/TRT Terms:
  • Publication/ Report Number:
    OR-RD-FHWA-08-05
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Oregon
  • OCLC Number:
    742685369
  • Edition:
    Final report
  • Corporate Publisher:
    Oregon. Dept. of Transportation. Research Unit
  • NTL Classification:
    NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT
  • Abstract:
    For this study regional frequency analyses were conducted for precipitation annual maxima in the state of Oregon for the 24-hour duration. A total of 693 precipitation gages in Oregon, southern Washington, western Idaho, northern California and northern Nevada were included in the study, representing 34,062 station-years of record. A regional analysis methodology was utilized that pooled data from climatologically similar areas to increase the dataset and improve the reliability of precipitation-frequency estimates. The regional analysis methodology included L-moment statistics, and an index-flood type approach for scaling the annual maxima data. L-moment statistics were used to: characterize the variability, skewness and kurtosis of the data; measure heterogeneity in proposed homogeneous sub-regions; and assist in identification of an appropriate regional probability distribution.

    Spatial mapping techniques were employed for mapping of the precipitation-frequency information. This included spatial mapping of at-site means, L-moment ratio values of L-Cv and L-Skewness, and mapping of precipitation for selected recurrence intervals. Procedures were employed to minimize differences between mapped values and observed station values in a manner that was consistent with the regional behavior of the data and also recognized uncertainties due to natural sampling variability.

    Color-shaded isopluvial maps were developed for the 6-month, 2-year, 10-year, 25-year, 50-year, 100-year, 500-year, and 1000-year precipitation recurrence intervals. Electronic gridded datasets are available for use in creation of GIS applications that utilize precipitation-frequency information. Please see the "Supporting Files" tab for the zip of the data files.

  • Format:
    PDF
  • Funding:
    SPR 656
  • Collection(s):
  • Main Document Checksum:
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