Details:

Creators:
McEnroe, Bruce M. ; Young, C. Bryan
McEnroe, Bruce M. ; Young, C. Bryan Less -
Corporate Creators:
University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
Subject/TRT Terms:
[+]
Bridges And Culverts Counties Flood Hydrographs Hydrology Methodology Rainfall Tables (Data)
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
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:ba7f3184da139e39154a17c7cf6f88bc97bd02519dd01d76e2e1dd14f5567e15
Download URL:
https://rosap.ntl.bts.gov/view/dot/28404/dot_28404_DS1.pdf
File Type:

Supporting Files

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