Prediction of Flood Quantiles at Ungaged Watersheds in Louisiana: Technical Summary

Details

• Creators:
  Naghavi, Babak ; Cruise, J.F. ; Ekanayake, S.
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Watersheds
  • Information processing
  • Streamflow
  • Drainage
  • Alternatives analysis
  • Floods
  • Estimating
  • Equations
  • Two component extreme values
  • generalized extreme value
  More +
• Publication/ Report Number:
  229
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana ; United States
• TRIS Online Accession Number:
  00601535
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  Four popular regional flood frequency methods were compared using Louisiana stream flow series. The state was divided into four homogeneous regions and all undistorted, long-term stream gages were used in the analysis. The GEV, TCEV, regional LP3 and USGS regression methods were applied to this data base and compared in terms of descriptive capabilities. Based upon several factors, the GEV method was selected as the superior method overall. A procedure to apply this method to ungaged watersheds using regression equations and regional non-dimensional flood distribution was then developed. It was found that the procedure performed well when applied to data not used in the calibration of the model. The method is easier to apply and more accurate in terms of descriptive and probably predictive ability than any other feasible method.
• Format:
  PDF
• Funding:
  89-2SS(B)&89-3SS(B)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/39427/dot_39427_DS1.pdf
• File Type:
  [PDF - 100.26 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:eecaf05181c7224bb387b6a8ccd048824492d40da20610215a3ae7308b28fc9b