New Rainfall Coefficients

The objective of this project is to update the depth duration frequency (DDF) and intensity duration frequency (IDF) of annual maximum rainfall throughout Texas from previous research and implementation projects sponsored by the Texas Department of Transportation (TxDOT). Previous research and implementation projects include: (1) 0-4193, Regional Characteristics of Unit Hydrographs. (2) 0-4194, Regional Characteristics of Storm Hyetographs. (3) 0-5521, Develop Statewide Regression Equations for Improved Flood Peak Estimation. (4) 5-1301, Updated Precipitation Atlases for Texas. The Texas Tech University (TTU) and United States Geological Survey (U 808) research teams will work concurrently to develop new rainfall coefficients, provide readily usable equations to generate design storm photographs, and rapidly deploy the results of the research to TxDOT design engineers via a revised EBDLKUP-NEWflS tool. The research team will produce updated DDF/IDF values for 10-minutes duration to 24-hours duration precipitation by county in Texas. These DDF/IDF values will be used to fit a form of power-law equations having coefficients named E, B, D, so that the DDF/IDF for arbitrary durations between 10 minutes and 24 hours can be specified. The county-specific equations will be incorporated into a revised EBDLKUP-NEWXLS spreadsheet, and the E, B, and D values will be tabulated in both the spreadsheet and the final report.


  • English


  • Status: Completed
  • Funding: $194086.00
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Odell, Wade

  • Performing Organizations:

    United States Geological Survey Library

    1850 F Street, NW
    Washington, DC  United States  20242

    Texas Tech University, Lubbock

    Office of Research Services
    349 Administration
    Lubbock, Texas  United States  79409-1053
  • Principal Investigators:

    Cleveland, Theodore

  • Start Date: 20140822
  • Expected Completion Date: 0
  • Actual Completion Date: 20150831
  • Source Data: RiP Project 39937

Subject/Index Terms

Filing Info

  • Accession Number: 01568396
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6824
  • Files: RiP, STATEDOT
  • Created Date: Jun 27 2015 1:00AM