TECHNIQUES FOR ESTIMATING MAGNITUDE AND FREQUENCY OF FLOODS ON STREAMS IN INDIANA

Methods for estimating magnitude and frequency of floods on streams are necessary in the design of hydraulic structures and in flood-plain management. Equations for estimating the magnitude and frequency of floods on ungaged streams in Indiana were developed by multiple-regression analysis of basin characteristics and peak-flow statistical data from 242 gaged sites in Indiana, Ohio, and Illinois. The State of Indiana was divided into seven areas on the basis of regression analysis. A set of equations for estimating peak discharges with recurrence intervals of 2, 10, 25, 50, and 100 years was developed for each area. The equations are valid for unregulated and nonurban streams. Significant basin chaaracteristics in the equations are drainage area, channel length, channel slope, mean annual precipitation, intensity of precipitation, storage, and a runoff coefficient. Standard errors of estimate for the equations range from 24 to 45 percent. A rainfall-runoff model was used to extend the length of record at 11 gaged sites on small streams. Flood-frequency data from the synthetic peaks and from the observed peaks were combined by weighting techniques. (Author)

• Corporate Authors:

  U.S. Geological Survey

  F Street Between 18th and 19th Street, NW
  Washington, DC    20244

  Indiana Department of Highways

  Indianapolis, IN  United States 

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Glatfelter, D R
• Publication Date: 1984

Media Info

• Features: Figures; References; Tables;
• Pagination: 110 p.

Subject/Index Terms

• TRT Terms: Coefficients; Drainage; Equations; Estimating; Floods; Length; Multiple regression analysis; Rainfall; Regression analysis; Runoff; Slopes; Streams
• Uncontrolled Terms: Flood frequency; Flood peaks
• Old TRIS Terms: Channels; Multiple regression; Precipitation
• Subject Areas: Data and Information Technology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00393767
• Record Type: Publication
• Report/Paper Numbers: 84-4134 Final Rpt.
• Files: TRIS, USDOT, STATEDOT
• Created Date: May 31 1985 12:00AM