United States Department of Transportation
i
Evaluation of design flood frequency methods for Iowa streams : final report, June 2009.
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2009-06-01
[PDF-1.26 MB]
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Edition:Final report.
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Abstract: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.
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