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Development of new precipitation frequency tables for counties in Kansas using NOAA Atlas 14.

File Language:
English


Details

  • Creators:
    McEnroe, Bruce M. ; Young, C. Bryan
  • Corporate Creators:
    University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    KS-14-13
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Kansas
  • Corporate Publisher:
    Kansas. Dept. of Transportation. Bureau of Materials & Research
  • Abstract:
    This report documents the development of KDOT’s new rainfall tables for counties in Kansas based on ; NOAA Atlas 14 Volume 8. These new tables provide rainfall depths and intensities for durations from 5 ; minutes to 24 hours and recurrence intervals from 1 to 500 years. The new tables will replace the KDOT’s ; current rainfall tables. This report also provides an overview of the Atlas 14 products, a summary of the ; methodology used to develop the Atlas 14 estimates, and guidance for use of the new KDOT rainfall tables. ; Averaged across Kansas, precipitation estimates have decreased for most combinations of duration and ; recurrence interval. The changes vary geographically across Kansas. The changes in Johnson, Sedgwick and ; Finney Counties were examined in detail. The spatial variability of the precipitation estimates has increased ; considerably. The changes in the precipitation frequency estimates are not necessarily indicative of actual ; changes in extreme precipitation characteristics. These changes are largely attributable to the improved ; statistical methodologies used in Atlas 14 compared to TP-40 and HYDRO-35. ; The impacts of these changes on design discharges for bridges, culverts and other drainage structures ; vary by hydrologic method. Design discharges computed with the Rational formula and the Extended ; Rational equations for Kansas will increase or decrease by the same percentage as the precipitation input to ; these equations. Discharges computed with the three-variable regression equations for Kansas will increase ; or decrease by a slightly larger percentage than the precipitation input. Discharge computed with the USGS ; flood-frequency regression equations for Kansas are unaffected by the changes in the precipitation frequency ; estimates. Design discharges computed by flood hydrograph simulation will decrease slightly in most cases ; for most locations in Kansas.
  • Format:
    PDF
  • Funding:
    C1967
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/28404/dot_28404_DS1.pdf
  • File Type:
    Filetype[PDF - 3.34 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:ba7f3184da139e39154a17c7cf6f88bc97bd02519dd01d76e2e1dd14f5567e15
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