Evaluation of design flood frequency methods for Iowa streams : final report, June 2009.

Details

• Creators:
  Bradley, A.A. ; Wehmeyer, L.L. ; Chen, L.C.
• Corporate Creators:
  Iowa Institute of Hydraulic Research. Hydroscience & Engineering
• Corporate Contributors:
  Iowa. Highway Research Board ; Iowa. Dept. of Transportation
• Subject/TRT Terms:
  • Rational formula (Hydraulics)
  • Runoff
  • Flood forecasting--Iowa
  • Floods--Iowa--Mathematical models
• Publication/ Report Number:
  IHRB Project TR-533
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Edition:
  Final report.
• Corporate Publisher:
  Iowa Institute of Hydraulic Research. Hydroscience & Engineering
• 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.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17088/dot_17088_DS1.pdf
• File Type:
  [PDF - 1.26 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:839a0b1b03ec736d06bed1ec0a0ec38130560a2ae5dbc265a3938ce9eb7ba4b7