COMPARISON OF RECENTLY PUBLISHED FORMULAE FOR FLOOD FREQUENCY IN PENNSYLVANIA

TWO RECENTLY DEVELOPED METHODS FOR PREDICTING FLOOD FLOW ARE THE PSU METHOD, DEVELOPED BY DR. REICH AND HIS ASSOCIATES AT PENNSYLVANIA STATE UNIVERSITY FOR RURAL WATERSHEDS UP TO 200 SQUARE MILES IN SIZE, AND THE PAGE METHOD, DEVELOPED BY U. S. GEOLOGICAL SURVEY FOR RURAL WATERSHEDS UP TO 26,000 SQUARE MILES IN SIZE. FLOOD FLOWS ESTIMATED FOR THESE TWO METHODS FOR 42 SELECTED WATERSHEDS IN PENNSYLVANIA, RANGING FROM 3 TO 200 SQUARE MILES IN SIZE AND 28 TO 60 YEARS OF OBSERVED RECORD, WERE COMPARED WITH THE OBSERVED DATA FOR RETURN PERIODS OF 2, 10, 25, AND 50 YEARS. THE RESULTS SHOW THAT FOR 2-YEAR AND 10-YEAR FLOODS, THE PSU METHOD IS FAVORED, AND FOR 25-YEAR AND 50-YEAR FLOODS, THE PAGE METHOD SEEMS BETTER. THIS IS MAINLY DUE TO THE DIFFERENT CURVE FITTING TECHNIQUES USED IN THE DEVELOPMENT OF THESE METHODS, MOSTLY ON SHORT OBSERVED RECORDS WHICH OFTEN INVOLVE OUTLIERS. THEREFORE, HOW TO TREAT THE OUTLIERS ADEQUATELY REMAINS TO BE THE MAJOR PROBLEM IN THE DEVELOPMENT OF BETTER PRACTICAL METHODS FOR ESTIMATING FLOOD FLOW. /FHWA/

  • Supplemental Notes:
    • FHWA P.O. 2-1-1196
  • Corporate Authors:

    Reich, Brian M, Pe

    ,    
  • Authors:
    • Reich, B M
  • Publication Date: 1972-2

Media Info

  • Pagination: 110 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00204043
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT
  • Created Date: Apr 8 1973 12:00AM