Evaluation of Design Flood Frequency Methods for Iowa Streams, TR-533, 2009

(2009) Evaluation of Design Flood Frequency Methods for Iowa Streams, TR-533, 2009. Transportation, Department of


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TR-533 Tech Brief.pdf

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The objective of this project was to assess the predictive accuracy of flood frequency estimation for small Iowa streams based on the Rational Method, the NRCS curve number approach, and the Iowa Runoff Chart. The evaluation was based on comparisons of flood frequency estimates at sites with sufficiently long streamgage records in the Midwest, and selected urban sites throughout the United States. The predictive accuracy and systematic biases (under- or over-estimation) of the approaches was evaluated based on forty-six Midwest sites and twenty-one urban sites. The sensitivity of several watershed characteristics such as soil properties, slope, and land use classification was also explored. Recommendations on needed changes or refinements for applications to Iowa streams are made.

Item Type: Departmental Report
Keywords: Accuracy, Design flood, Estimating, Streams, Urban areas, Watersheds
Subjects: Transportation
Transportation > Roads and highways
Transportation > Research
Transportation > Environment
Transportation > Environment > Water
ID Code: 20054
Deposited By: Iowa DOT Library
Deposited On: 07 Jul 2015 12:17
Last Modified: 22 Jan 2018 15:20
URI: https://publications.iowa.gov/id/eprint/20054