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  • 1.  Old HEC-1 Model

    Posted 05-08-2015 04:09 PM

    I have a project that I'm trying to reproduce a very old HEC-1 model (Version July 1978 Last Modification 26 Feb 79) to run on a newer HEC-1 model (Version 4.1 Jun 1998). I have coded the data and it runs and reproduces the inflow hydrograph but doesn't route the hydrograph through the dam.  I have tried a number of changes and nothing worked, so  I have attached the input (OSH2.dat) and output (OSH2.out)files and was wondering if some one could take a quick look and see if you see the problem and let me know the solution.

    Any help is greatly appreciated.

    Stanley Johnson P.E., L.S., M.ASCE
    Chief Engr
    Columbus OH
    (614) 864-8405

  • 2.  RE: Old HEC-1 Model

    Posted 05-11-2015 11:47 AM
    I don't see what you are doing wrong either.

    PADEP Dam Safety recommended downloading the Maryland HEC1 editor & HEC1 program.

    I wonder if you have an invisible code in the ASCII text file.  Maybe type over from scratch?

    Ann Wingert P.E., M.ASCE
    Hanover Engineering Associates, Inc.
    Bartonsville PA

  • 3.  RE: Old HEC-1 Model

    Posted 05-14-2015 04:05 PM

    I reviewed the code several time and could not find the problem. I opened the file in Corps of Engineers COED and there was no indication of a problem there either. Hats off to Chung-Cheng Yen for a good catch. My experience has shown, on many occasions that  'o' / '0' has been the culprit in coding errors. This exercise has been a good refresher lesson.

    Joseph Ruperto P.E., M.ASCE
    Project Engineer
    URS Corporation
    Tampa FL
    (813) 636-2165

  • 4.  RE: Old HEC-1 Model

    Posted 05-11-2015 04:28 PM


    First entry in SQ card should be "zero" not "o".


    Chung-Cheng Yen, PhD, PE |Surface Water Group

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