FLOOD PREDICTION METHODS FOR PENNSYLVANIA HIGHWAY CROSSINGS

THE OBJECTIVE OF THIS STUDY WAS THE DEVELOPMENT OF SIMPLE METHODS FOR HYDROLOGIC DESIGN OF CULVERTS AND BRIDGES FOR PENNSYLVANIA WATERSHEDS IN THE SIZE RANGE FROM ONE AND ONE- HALF TO 200 SQ. MILES. ANNUAL SERIES DATA FOR PENNSYLVANIA WATERSHEDS IN THIS RANGE, SUPPLEMENTARY DATA FROM SURROUNDING STATES, FLOOD HYDROGRAPH AND RAINFALL DATA, QUADRANGLE MAPS, AERIAL PHOTOS, AND SOILS AND GEOLOGIC MAPS WERE USED. FOR THE ANNUAL SERIES DATA, GUMBEL ANALYSIS WAS BEST, THE SLOPE OF THE GUMBEL LINE BEING NEARLY CONSTANT FOR ALL WATERSHEDS. REGRESSION METHODS WERE USED TO OBTAIN PREDICTION EQUATIONS FOR THE MEAN ANNUAL FLOOD. THE HYDROGRAPH DATA WAS ANALYZED BY REGRESSION AND MATHEMATICAL MODELING TECHNIQUES IN AN ATTEMPT TO DEVELOP FLOOD VOLUME AND FLOOD HYDROGRAPH PREDICTION METHODS. MANY OF THE WATERSHEDS WERE VISTIED TO ASCERTAIN LOCAL FACTORS INFLUENCING FLOOD RESPONSE. PARTICULAR ATTENTION WAS GIVEN TO THE EFFECTS OF SOILS AND GEOLOGY. THE FINAL RESULT IS A DESIGN METHOD BY WHICH FLOODS FOR EXPECTED RETURN PERIODS OF 2.33 THROUGH 500 YEARS MAY BE PREDICTED IN WATERSHEDS FROM 1 1/2 TO 200 SQ. MILES. A MAP DENOTES THOSE PARTS OF PENNSYLVANIA WHERE VARIOUS CHARTS SHOULD BE APPLIED IN THIS DESIGN PROCESS. RESULTS OF THE METHOD ARE COMPARED TO OBSERVED FLOODS AND TO THE BPR AND THE USGS METHODS PREVIOUSLY USED. /AUTHOR/

  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  USA  16802

    Pennsylvania Department of Transportation

    1215 Transportation and Safety Building
    Harrisburg, PA  USA  17120

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Reich, B M
    • Jackson, D R
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00204039
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Study No 68-26
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 27 1972 12:00AM