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  1. zelgar

    Help understanding a theory

    Based on the rules, it appears that this is for Bonner County, ID: link SUBCHAPTER 7.2 - GRADING, STORMWATER MANAGEMENT AND EROSION CONTROL: link I'd make certain that this rule is applicable to your case looking at 12-720.2: APPLICABILITY: and 12-720.3: ACTIVITIES TO WHICH THIS SUBCHAPTER IS...
  2. zelgar

    Oscillations and Equalizing in Hydrocad

    As a regulator, we sometimes do not have access to the modeling software, so are not experts in their use. Since the results of modelling the two ponds as two individual ponds resulted in the oscillation warnings, I would provide them the result of modeling the ponds separately and indicate the...
  3. zelgar

    High hydraulic conductivity materials

    Agreed, I divided instead of multiplying by 2.54 when converting from inches to cm.
  4. zelgar

    High hydraulic conductivity materials

    500 in/hr = 0.055 cm/sec so you're looking for a coarse sand or something larger.
  5. zelgar

    ***LOW PRESSURE SEWER INFORMATION DESPARATELY NEEDED***

    The only times I've heard of raw sewage backing up into houses/basements is when sewer lines are getting more water into the system than can be handled by the lift stations. This typically happens to areas that are designed to be 100% sanitary sewers but there is an inflow/infiltration problem...
  6. zelgar

    Stormwater remediation and erosion control recommendations

    Unfortunately, your attachment doesn't clearly show the pond. Based off the information, I was able to look at it through Google Maps & Street View. It looks like there is a very small triangular pond in the corner of the property behind the dentist office. Could this pond be extended to run...
  7. zelgar

    Runoff coefficients for sloped regions and hydraulic soil groups

    I would ask your PM why they want you to adjust your calculations. Before you do, you might run the model adjusting for doing the areas as a whole with the different runoff coefficients. If the best case won't get the results your PM wants, there is no point in spending a lot of time to go...
  8. zelgar

    BSA - Autodesk Software License Review

    This sounds like what the IT Department should be handling. Based on what I see at AutoDesk's forums, this sounds legit: https://forums.autodesk.com/t5/installation-licensing/request-from-bsa-the-software-alliance/td-p/13204271
  9. zelgar

    Someone stole my CAD files!

    LOTE, do your clients know this is your policy before they sign the contract since they aren't getting the CAD files that match the work you performed? It sounds to me like they're not actually getting a CAD file for the work. It sounds like they'd be better to get a PDF with the embedded...
  10. zelgar

    Ultrasonic thickness testing on steel tanks

    When I've seen shell thickness measurements, they normally will do one per cardinal direction (i.e., N, S, E & W) per elevation @ multiple elevations. Additional testing may be performed at areas where there may be damage/deterioration or where they want more details (e.g., individual welds).
  11. zelgar

    API 650 design using TANK software

    Looking at the formulae and the results, it appears that the reason for the error is that you're getting a negative pressure for the equations: Maximum Pressure per F.4.2 Equation 1 and Maximum Pressure per F.4.2 Equation 2. In both of these equations you're subtracting RMW which has a value...
  12. zelgar

    Drain Tile for drying a hay field

    Please refrain from posting in multiple locations. This question was posted in 3 forums: Ag forum https://www.eng-tips.com/viewthread.cfm?qid=522558, Soil/groundwater https://www.eng-tips.com/viewthread.cfm?qid=522560, and here. I wouldn't of said anything if it was only 2 since the Ag forum...
  13. zelgar

    Drain Tile Recommendations for a Swamped Hay Field

    You probably should contact your local soil conservation services as they may be able to help you a lot with this or the NRCS. The NRCS may be able to assist with the design. 1. Your 6" pipe will be able to drain more liquid than a 4" pipe. 2. I think it's typically 300' apart, but it will be...
  14. zelgar

    Concrete Mix Design Trial Mixes

    Those are 3 different mixes. If you are wanting to evaluate differences between water to cement ratios, the only thing that should be varying is the amount of water and cement. The amount of aggregate should remain constant.
  15. zelgar

    Research paper

    Is this it? https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.issmge.org/uploads/publications/1/30/2001_01_0018.pdf&ved=2ahUKEwjI9q7ZnuiHAxW2kIkEHVL0CQQQFnoECCUQAQ&usg=AOvVaw3HkOutcLJNrrYV-LndaBgh
  16. zelgar

    Landfill Liner Slope Stability (Static & Seismic)

    You need to consider all of the failure modes, as the slope failure may occur in the waste itself. It doesn't do you any good to have a liner (cap or bottom) that is stable if the underlying material (soil for bottom liner, waste for cap) if the failure mechanism will occur in the materials you...
  17. zelgar

    Need to hire a geotech engineer in south-central Indiana

    Here's some information you should review from Indiana's DNR's site: https://www.in.gov/dnr/water/dams-and-levees/
  18. zelgar

    How to create customized/personal defined rainfall event with 11 hours' precipitation

    I don't think you have enough data to calculate the 2yr-24 hour storm. You have only 11 hours worth of data and you're trying to predict the amount of rain for a 24 hour period that will occur 50% during any storm event. Your data indicated 2" of rain in 11 hours, but who knows how that...
  19. zelgar

    Secondary Containment System

    Have you considered doubled-walled tanks? This wouldn't address any issues of secondary containment for ancillary equipment, but may be the best solution for the tanks themselves.
  20. zelgar

    Death of Principal Engineer

    Here's a few PE rules that I think prevent you from working until you have a PE that's in charge at your workplace: 58-22-305 Exemption from licensure allows the non-engineers to do engineering work, provided they're working under a PE. 58-22-603 Seal -- Authorized use. Item (1)(b) allows the...

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