PREDICTION OF FLOOD QUANTILES AT UNGAGED WATERSHEDS IN LOUISIANA. FINAL REPORT

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.

• Record URL:
  • http://www.ltrc.lsu.edu/pdf/2008/fr_229.pdf
• 
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/39427
• Corporate Authors:

  Louisiana Transportation Research Center

  4101 Gourrier Avenue
  Baton Rouge, LA  United States  70808

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Naghavi, B
  • Cruise, J F
  • Ekanayake, S
• Publication Date: 1989-12

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: 80 p.

Subject/Index Terms

• TRT Terms: Accuracy; Equations; Floods; Forecasting; Regression analysis; Stream gages; Watersheds
• Uncontrolled Terms: Flood frequency
• Subject Areas: Data and Information Technology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00601535
• Record Type: Publication
• Report/Paper Numbers: FHWA/LA-90/229
• Contract Numbers: 89-2SS(B)&89-3SS(B)
• Files: NTL, TRIS, USDOT
• Created Date: Nov 30 1990 12:00AM