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  1. johnengr

    TR-55 Sheet Flow

    In talking with some guys yesterday we decided that the N value for rip rap which is in the 30ths would be appropriate to use for the sheet flow time of concentration calculation.
  2. johnengr

    TR-55 Sheet Flow

    We are working with a sports field that has artificial turf, with a clean stone base. Would like some opinions on an appropriate N value to use for the sheet flow until it enters the piping system.
  3. johnengr

    Report Heading

    Were in the program is the company name entered so it is printed in the report
  4. johnengr

    plastic limit of soils

    Thanks woofar and ron for you information. The 2006 IRC requires a determination of the expansion index in accordance with ASTM D 4829 or the Atterberg limit info testing. What is your opinion on this test for expansive soil identification and degree of severity? Thanks-John
  5. johnengr

    plastic limit of soils

    Recently I had some soil tested for Atterberg limits for shrink swell determination per the IBC. The testing lab report noted that the plastic limit was zero as they could not get the sample to thread down to the 1/8" requirement. This in turn forced the Plasticity Index to equal the liquid...
  6. johnengr

    HEC-1 Input

    Thanks: I will try to get a copy early next week.
  7. johnengr

    HEC-1 Input

    RWF7437: Thanks for the link. It will let me in but not as far as TR 210.
  8. johnengr

    HEC-1 Input

    Hec-1 with Dam Breach simulation has been accepted by VA Dam Safety in the past. Input information and output analysis utilizes other calculation procedures not in HEC-1; Breach input factors are calculated from NWS Simple Dam Break and Breach Predictor equations. It is my understanding that the...
  9. johnengr

    HEC-1 Input

    The state of Virginia's new Impounding Structure Regulations now require a developed PMF Hydrograph for 6, 12 and 24 hour durations with the hydrograph that creates the largest peak outflow to be used to determine capacity for nonfailure and failure analysis. To my knowledge the reviewing...
  10. johnengr

    HEC-1 Input

    I obtained the 6, 12 and 24 hour pmp depth from this reference, could not located any cumulative precipitation time series data.
  11. johnengr

    HEC-1 Input

    I need to locate the PC Record(Cumulative Precipitation Time Series) for the 12 hour pmp storm event. I have the 6 hour(51points) and the 24 hour(241points) PC data. When I change the IN value to 1.5 on the 24 hours file and also the PB file for PMP it does not correlate to the 6 hour (51...

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