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  • Users: gbam
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  1. gbam

    1D No-Rise analysis problems

    Maybe evaluate your Corrected Effective model for ineffective flow areas and assess the proposed condition. We are doing that exact thing for one of our projects. Not sure if it applies, but worth a check.
  2. gbam

    Help with Design Resources for Small Overflow Weir Design - Hydropower & Microhydropower

    Another great resource is the Handbook of Hydraulics 7th Ed. (Brater, King, Lindell, Wei)
  3. gbam

    Large Format Plotter Recommendations (44"+)

    Hi there, we currently have a HP plotter and I do not like it. I suggest you try to find a comparable OCE (if they are still around). The OCE plotter/scanner we used to have was absolutely incredible. Good Luck!
  4. gbam

    HEC-RAS Flow Regime

    Sorry for the delay, the studies I have reviewed have been all sand bed channels. I suggest you look at the potential bed forms that will form in your storm event. Maybe research bed forms. I still use my text book from college: Sediment Transport Theory and Practice by: Chih Ted Yang...
  5. gbam

    HEC-RAS Flow Regime

    Great Question. It depends on the bed material and resulting bedforms. If your bed is rigid then I would run the mixed regime; ie.: roadway pavement or concrete channel type. Now if you have a sand bed channel, there are a number of white papers and studies showing that a sand bed channel will...
  6. gbam

    How to model channel on HEC-RAS with different surface material?

    Its pretty straight forward. Under Cross Section Data/Options/Horizontal Variation in n...
  7. gbam

    Hec-Ras- Cliping a large HEC-RAS model to a small specific area

    Few questions: 1- Is this a regulatory model? 2- Why not modify specific area and run entire model? This approach can provide additional information for upstream and downstream tie-in points from hydraulic structures, especially provide opportunity in overbank storage if modifications are...
  8. gbam

    Drainage Ditch Design (Upgrade of Existing)

    Just when you are laying out the control consider the field layout... I often hear the expletives from contractors in the field. If you have a logical control the surveyor can easily establish the field control.
  9. gbam

    Drainage Ditch Design (Upgrade of Existing)

    In addition to fel3's advice, consider the future construction staking like obstructions and such.
  10. gbam

    SWM Facility - High Water Table and Fine Sand Subgrade

    Curious, does that table assume 100% saturation? I recommend involving the geotechnical engineer to document the saturated under water stable slope in their sealed report. That is how we approach design of retention/detention basins.
  11. gbam

    Inquiry Regarding Flattest Slope for 44m PVC Stormwater Drainage Pipe at Fuel Dispenser

    Hi T-Jay, I would first consult your design requirements for the approving agency. Second, If no design requirements then consider minimum self scouring velocity in my area that value is 2-2.5 ft/sec which translate to 0.6 - 0.75 m/sec. One can use a nomograph or Manning's Eqn. to compute the...
  12. gbam

    Include culverts in a peak runoff rate calculation?

    It is unlikely that the culverts and ditch will impede/attenuate the runoff enough to change your computed flow rate. Typically, the only time we address items in the watershed is if there are regional or large detention basins; which will attenuate the inflow to the basin. I would say ignore...
  13. gbam

    Hydraulic Area - Converting a box culvert to a series of circular culverts

    I agree with HY-8 this would be a good way to compute the culvert hydraulics. I would add that in lieu of a hydrologic study to determine the runoff flowrate, one can assess the current wooden box based on a specific headwater elevation and make sure you provide the same culvert capacity for...
  14. gbam

    Connection of Reno Mattress to Outfall Headwall

    Interesting topic, I know i am a bit late but FYI: We like to pin to the outlet of the culvert so if there is erosion or settlement it stays connected to the outlet. We have used stainless or galvanized eyes anchored into the concrete at the top of cut-off wall or bottom of wingwall, etc... We...
  15. gbam

    HEC-RAS

    YouTube has a several videos for modeling that you can view and "self-train".
  16. gbam

    How to find pipe depths on inlets with a Snout

    Can you get photos of the SNOUT? Refer to this website: https://bmpinc.com/ are these the same? If yes then you can approximate inverts based on their standard details.
  17. gbam

    How to find pipe depths on inlets with a Snout

    Have you pulled As-Built plans and identified the specific SNOUT used? Once you do then you can use the standard detail for the invert location.
  18. gbam

    Flatland Detention

    First off, lets address the required volume for detention and how that is regulated. Are your requirements to meet pre-project conditions (Balanced Basin Approach) or and overall decrease in outflow (Critical Basin Approach)from your site. Have you computed the pre vs post project hydrographs...
  19. gbam

    Pumping station problem

    First off more information is needed; but, two things come to mind: 1-Does the runoff get to the pump sump? 2-Are there clogs in the system?
  20. gbam

    Land Development Question

    My recommendation would be to hire a planner to address the "pros" and "cons" for your site. They would even be able to provide a sketch of the site with your development.

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