Details:

Creators:
McEnroe, Bruce M. ; Gonzalez, Pablo
McEnroe, Bruce M. ; Gonzalez, Pablo Less -
Corporate Creators:
Kansas State University ; University of Kansas
Kansas State University ; University of Kansas Less -
Corporate Contributors:
Kansas. Dept. of Transportation. Bureau of Materials & Research
Subject/TRT Terms:
[+]
Discharge Flood Hydrographs Floods Gage Hydrograph Regression Equation Storm Duration Storms Watersheds
Publication/ Report Number:
K-TRAN: KU-02-4
Resource Type:
Tech Report
Geographical Coverage:
Kansas ; United States
Kansas ; United States Less -
TRIS Online Accession Number:
00969764
Edition:
Final Report July 2001 – March 2003
Corporate Publisher:
Kansas. Dept. of Transportation. Bureau of Materials & Research
Abstract:
Design flows estimated by flood hydrograph simulation can be reasonably accurate or greatly in error, depending upon the modeling procedures and inputs selected. The objectives of this research project were (1) to determine which combinations of modeling procedures and inputs yield the best discharge estimates under various conditions and (2) to develop specific guidelines for flood hydrograph simulation for possible inclusion in the KDOT Design Manual. Many different combinations of modeling procedures and inputs were tested in flood simulations for 66 gaged watersheds in Kansas. The test watersheds were all primarily rural with unregulated streams, drainage areas under 50 km2 and gaging records of 20 years or longer. The simulations were performed with the HEC-1 computer program of the U. S. Army Corps of Engineers. The key inputs were the duration of the hypothetical frequency-based storm and the antecedent moisture condition (AMC) in the NRCS loss model. Floods with six different recurrence intervals (2, 5, 10, 25, 50 and 100 years) were simulated using four different storm durations (3, 6, 12 and 24 hours), five different antecedent moisture conditions (AMC 2, 2<, 2=, 2> and 3) and the two different unit-hydrograph models (NRCS and Snyder). The results for the watersheds in eastern and western Kansas were analyzed separately. We computed the bias and standard error of the simulated flows, relative to the gage-based estimates, for each combination of recurrence interval, storm duration, AMC and unit-hydrograph model in each region. From these results, we identified combinations of storm durations and AMCs that yield unbiased discharge estimates for each set of conditions. Longer storm durations and/or higher AMCs are needed for higher recurrence intervals. The storm durations are shorter and the AMCs are lower in the western region than in the eastern region. Flood hydrograph simulation with the recommended inputs is approximately as accurate as the USGS regression equations in eastern Kansas and more accurate than the USGS regression equations in western Kansas. The standard errors of the simulated flows are larger in western Kansas than in eastern Kansas. We recommend simplified guidelines for flood hydrograph simulation for inclusion in the KDOT Design Manual, Volume I, Part C. These guidelines specify the NRCS UH model and a single combination of storm duration and AMC for each recurrence interval and region. 50 p.
Format:
PDF
Funding:
C1273
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:6b6dc1d1caff3ff837c2842ecaf42fd3cb2ffed5c4b7fc9b450bf71b63b1e262
Download URL:
https://rosap.ntl.bts.gov/view/dot/16060/dot_16060_DS1.pdf
File Type:

Supporting Files

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