EXPERIMENTAL CATCHMENTS AID INTERPRETATION OF A MORE EXTENSIVE FLOOD NETWORK

FLOOD PEAK DISCHARGE DATA FROM USGS EXTENSIVE NETWORK OF GAUGED CATCHMENTS DISTRIBUTED OVER THE STATE OF OHIO, 41,222 SQ MI- (106,800 SQ KM) OF DRAINAGE AREAS OF LESS THAN 28.9 SQ MI (74.6 SQ KM) WERE ANALYZED IN LIGHT OF THE RELATIONSHIP BETWEEN AREA AND MAXIMUM ANNUAL EXTREME-VALUE DISCHARGES OBTAINED FROM A CLUSTER OF ARS EXPERIMENTAL CATCHMENTS OF 0.19-27.5 SQ MI (0.5-71.2 SQ KM) IN SIZE NEAR COSHOCTON, OHIO. MEAN ANNUAL FLOOD VALUES FOR EACH USGS CATCHMENT, ADJUSTED TO A COMPARABLE VALUE FOR A 10 SQ MI (26 SQ KM) CATCHMENT, PLOTTED ON A MAP OF OHIO SHOWED A MORE SYSTEMATIC REGIONAL TREND THAN DO FLOOD STATISTICS NOT MODIFIED FOR SIZE OF CATCHMENT. THE SLOPE OF THE GUMBEL PROBABILITY LINES SHOWED ENOUGH CONSISTENCY TO WARRANT THEIR USE IN PREDICTING FLOOD PEAK VALUES FOR UNGAGED AREAS AND FOR A VARIETY OF FREQUENCIES. EXTREMELY HIGH FLOOD PEAK VALUES WERE DEFINED AS STATISTICAL OUTLIERS AND REMOVED FROM THE ANALYSES. CLIMATIC CONDITIONS THAT CAUSED THESE OUTLIERS ARE PRESENTED. /AUTHOR/

  • Supplemental Notes:
    • 68-26, 4665-562
  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802

    Pennsylvania Department of Transportation

    1215 Transportation and Safety Building
    Harrisburg, PA  United States  17120

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Reich, B M
    • Harrold, L L
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00204015
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Jul 27 1970 12:00AM